研究者データベース

西井 準治(ニシイ ジユンジ)
電子科学研究所 附属グリーンナノテクノロジー研究センター
教授

基本情報

所属

  • 電子科学研究所 附属グリーンナノテクノロジー研究センター

職名

  • 教授

学位

  • 工学博士(都立大学)

ホームページURL

科研費研究者番号

  • 60357697

J-Global ID

プロフィール

  • 昭和55年3月 東京都立大学工学部卒業
    昭和57年3月 東京都立大学大学院工学研究科修士課程修了
    昭和57年4月 日本板硝子(株)
    平成5年4月 工業技術院大阪工業技術試験所研究官
    平成5年10月 工業技術院大阪工業技術試験所主任研究官
    平成11年4月 大阪工業技術研究所光機能材料部ガラス構造研究室長
    平成13年4月 独立行政法人産業技術総合研究所光技術研究部門主幹研究員兼光波制御材料グループリーダー
    平成21年7月 北海道大学電子科学研究所教授
    平成24年4月 北海道大学電子科学研究所附属グリーンナノテクノロジー研究センター教授
    平成25年10月 北海道大学電子科学研究所長


    平成29年4月 北海道大学理事副学長


    令和2年10月 北海道大学電子科学研究所教授


     

研究キーワード

  • イオン交換   イオン伝導   光学材料   酸化物材料   無機材料   ナノインプリント   周期構造   ナノ加工   光導波路   分散制御   

研究分野

  • ナノテク・材料 / 無機材料、物性
  • ナノテク・材料 / 光工学、光量子科学

職歴

  • 2009年 - 2012年 北海道大学 電子科学研究所 教授

所属学協会

  • 日本化学会   応用物理学会   日本セラミックス協会   

研究活動情報

論文

  • Madoka Ono, Junji Nishii
    Journal of the Ceramic Society of Japan 130 8 558 - 562 2022年08月01日
  • Tomohiro Ishiyama, Takuya Yamaguchi, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata
    Journal of The Electrochemical Society 169 3 034517 - 034517 2022年03月01日 
    The temperature dependence of proton conductivity in 36HO1/2−4NbO5/2−2BaO-4LaO3/2−4GeO2−1BO3/2−49PO5/2 glasses prepared through the alkali-proton substitution method was investigated in this study. The activation energy of proton conduction, Ea, was found to exhibit an non-Arrhenius type temperature dependence. The origin of the temperature dependence of the proton conductivity caused by thermal expansion of the glass structure was discussed in terms of the effect of changes in the local environment surrounding the protons. These changes were elucidated using Raman spectroscopy, 1H- and 31P-NMR, infrared spectroscopy, and molecular modeling. Because protons form O-H bonds, they are sensitive to changes in the distance between two oxygen atoms, which affects the strength of the hydrogen bond, and concluded that there is a temperature dependence as observed.
  • Suguru Iwasaki, Mihiro Hoshino, Haruhiko Morito, Masaya Kumagai, Yukari Katsura, Melbert Jeem, Madoka Ono, Junji Nishii, Masaya Fujioka
    Inorganic Chemistry 2022年03月01日
  • Suguru Iwasaki, Haruhiko Morito, Takashi Komine, Kazuki Morita, Taizo Shibuya, Junji Nishii, Masaya Fujioka
    Advanced Materials 2106754 - 2106754 2022年01月24日
  • Takahisa Omata, Aman Sharma, Issei Suzuki, Tomohiro Ishiyama, Shinji Kohara, Koji Ohara, Madoka Ono, Yang Ren, Khurelbaatar Zagarzusem, Masaya Fujioka, Gaoyang Zhao, Junji Nishii
    CHEMPHYSCHEM 2021年12月 
    Anhydrous silicophosphoric acid glass with an approximate composition of H5Si2P9O29 was synthesized and its thermal and proton-conducting properties were characterized. Despite exhibiting a glass transition at 192 degrees C, the supercooled liquid could be handled as a solid up to 280 degrees C owing to its high viscosity. The glass and its melt exhibited proton conduction with a proton transport number of similar to 1. Although covalent O-H bonds were weakened by relatively strong hydrogen bonding, the proton conductivity (4x10(-4) S cm(-1) at 276 degrees C) was considerably lower than that of phosphoric acid. The high viscosity of the melt was due to the tight cross-linking of phosphate ion chains by six-fold-coordinated Si atoms. The low proton conductivity was attributed to the trapping of positively charged proton carriers around anionic SiO6 units (expressed as (SiO6/2)(2-)) to compensate for the negative charges.
  • T. Omata, A. Sharma, T. Kinoshita, I. Suzuki, T. Ishiyama, S. Kohara, K. Ohara, M. Ono, T. Fang, Y. Ren, M. Fujioka, G. Zhao, J. Nishii
    Journal of Materials Chemistry A 9 36 20595 - 20606 2021年08月 [査読有り]
     
    In this study, the effect of GeO2 on the thermal stability and proton mobility (μH) of proton-conducting phosphate glasses was experimentally investigated using 22HO1/2–3NaO1/2–(12 − x)LaO3/2xGeO2–63PO5/2 glasses.
  • Takahisa Omata, Issei Suzuki, Aman Sharma, Tomohiro Ishiyama, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe
    RSC Advances 11 5 3012 - 3019 2021年01月 [査読有り]
     

    Relationship between composition and proton mobility in proton conducting phosphate glass has been obtained using a statical analysis approach.

  • Khurelbaatar Zagarzusem, Masaya Fujioka, Taizo Shibuya, Satoshi Demura, Shintaro Adachi, Yoshihiko Takano, Melbert Jeem, Madoka Ono, Hideo Kaiju, Junji Nishii
    2D Materials 8 1 015007 - 015007 2020年10月15日 [査読有り]
  • Taiga Ajiri, Takao Yasui, Masatoshi Maeki, Akihiko Ishida, Hirofumi Tani, Junji Nishii, Yoshinobu Baba, Manabu Tokeshi
    ACS Applied Nano Materials 3 9 8810 - 8816 2020年09月25日 
    Recent studies on nanopillar arrays, one type of nanofluidic device, have demonstrated various tools for bioanalysis. When carrying out nanopillar array-based separation, it is indispensable to observe biomolecules, such as DNA, proteins, and extracellular vesicles, that have fluorescence labeling; however, fluorescence labeling influences the biomolecular characteristics. Here, we have proposed label-free monitoring of biomolecule separation by using diffracted light derived from the nanopillar array that was fabricated inside a microchannel by combining laser interference lithography with general photolithography techniques. Using an electrophoresis approach, we demonstrated that our diffraction-based label-free method possessed high sensor initialization ability, and the nanopillar array device successfully monitored DNA separation without labeling bias. Results obtained using our label-free monitoring of DNA separation confirmed, for the first time, that the molecular dynamics of DNA molecules in the nanopillar array were changed in the presence or absence of fluorescent labeling. The presented concept will provide a useful tool for nonbiased monitoring of label-free biomolecule analysis in nanofluidic channels.
  • Atsushi Miyazaki, Takuya Kinoshita, Takashi Tatebayashi, Tong Fang, Yang Ren, Tomohiro Ishiyama, Takuya Yamaguchi, Takahisa Omata, Masaya Fujioka, Kaiju Hideo, Gaoyang Zhao, Junji Nishii
    Journal of Non-Crystalline Solids 541 120064 - 120064 2020年08月 [査読有り]
  • Issei Suzuki, Masataka Tashiro, Takuya Yamaguchi, Tomohiro Ishiyama, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata
    International Journal of Hydrogen Energy 45 33 16690 - 16697 2020年06月24日 
    © 2020 Hydrogen Energy Publications LLC Ultra-thin proton-conducting phosphate glass was fabricated by press-forming at high temperature. The glass was evaluated for its ohmic loss reduction when installed as an electrolyte in intermediate-temperature fuel cells. The 36HO1/2–4NbO5/2–2BaO–4LaO3/2–4GeO2–1BO3/2–49PO5/2 glass (36H-glass) was prepared by alkali-proton substitution. Herein, 3–4 mg of 36H-glass was placed onto a 50 μm-thick stainless steel or Pd support and then sandwiched by a glassy carbon plate, whereupon a 600 kg load was applied at temperatures varying as 333–391 °C. Ultra-thin 36H-glass with a thickness of 16 μm was successfully obtained without degradation of proton conductivity. A fuel cell incorporating the Pd-supported ultra-thin 36H-glass was successfully operated at 300 °C, and the ohmic loss of the fuel cell was reduced down to 2.7 Ω cm2 from the previous reported value of several tens of Ω·cm2.
  • Robin Msiska, Shusaku Honjo, Yuki Asai, Masashi Arita, Atsushi Tsurumaki-Fukuchi, Yasuo Takahashi, Norihisa Hoshino, Tomoyuki Akutagawa, Osamu Kitakami, Masaya Fujioka, Junji Nishii, Hideo Kaiju
    Applied Physics Letters 116 8 082401 - 082401 2020年02月24日 [査読有り]
     
    The tunnel magnetocapacitance (TMC) effect in two-dimensional single nanogranular layered Fe/MgF2 films is investigated both experimentally and theoretically. We measured the frequency dependence of TMC ratios in a frequency range of 20Hz-1MHz and discovered that TMC ratios strongly depend on the frequency, reaching a peak value at a specific frequency. We observe that the largest TMC ratios occur at lower frequencies and that TMC values steadily reduce with increasing frequency. Notably, we achieved a maximum TMC ratio of 1.45%, which is the largest low-field TMC ever reported for granular films. A combination of the Debye-Frohlich (DF) model and the Julliere formula is used to fit the experimental data to theory, and an excellent agreement between the calculated values and the experimental data is obtained. To perfectly fit the experimental data, the conventional DF model is extended to a composite model in which three capacitors (with three different relaxation times) are introduced. Our findings will give further insights into the exact mechanism of the TMC effect in nanogranular films and will open broader opportunities for device applications, such as magnetic sensors and impedance tunable devices.
  • Robin Msiska, Shusaku Honjo, Yuki Asai, Masashi Arita, Atsushi Tsurumaki-Fukuchi, Yasuo Takahashi, Norihisa Hoshino, Tomoyuki Akutagawa, Osamu Kitakami, Masaya Fujioka, Junji Nishii, Hideo Kaiju
    Applied Physics Letters 116 8 082401-1 - 082401-5 2020年02月 [査読有り][通常論文]
     
    The tunnel magnetocapacitance (TMC) effect in two-dimensional single nanogranular layered Fe/MgF2 films is investigated both experimentally and theoretically. We measured the frequency dependence of TMC ratios in a frequency range of 20Hz-1MHz and discovered that TMC ratios strongly depend on the frequency, reaching a peak value at a specific frequency. We observe that the largest TMC ratios occur at lower frequencies and that TMC values steadily reduce with increasing frequency. Notably, we achieved a maximum TMC ratio of 1.45%, which is the largest low-field TMC ever reported for granular films. A combination of the Debye-Frohlich (DF) model and the Julliere formula is used to fit the experimental data to theory, and an excellent agreement between the calculated values and the experimental data is obtained. To perfectly fit the experimental data, the conventional DF model is extended to a composite model in which three capacitors (with three different relaxation times) are introduced. Our findings will give further insights into the exact mechanism of the TMC effect in nanogranular films and will open broader opportunities for device applications, such as magnetic sensors and impedance tunable devices.
  • 磁性薄膜エッジを利用した新規なナノスケール接合デバイスの創製
    海住 英生, 藤岡 正弥, 西井 準治
    電気学会誌 136 11 730 - 735 2019年11月01日 [査読無し]
  • T. Ishiyama, H. Kishimoto, K. Yamaji, T. Yamaguchi, J. Nishii, T. Yamashita, H. Kawazoe, T. Omata
    Int. J. Hydrogen Energy 44 45 24977 - 24984 2019年07月 [査読有り][通常論文]
     
    In this study, a proton conducting phosphate glass, which was fabricated by alkali-proton substitution, was clearly demonstrated to transport protons over a wide oxygen partial pressure in air and hydrogen atmospheres, and in both dry and wet conditions. The proton transport number was confirmed to be unity, regardless of whether the glass was exposed to air or hydrogen atmospheres, in both hydrogen concentration and water vapor concentration cells. The dry hydrogen can be formed by electrochemical hydrogen pumping without current leakage as a result of the presence of other charge carriers. These properties derive from a proton incorporation mechanism, which is non-dependent on defect equilibria, unlike acceptor-doped perovskite-type proton conducting oxides. The advantages of applying this proton conducting glass electrolyte to fuel cells and steam electrolysis is also discussed. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
  • T. Omata, T. Yamaguchi, S. Tsukuda, T. Ishiyama, J. Nishii, T. Yamashita, H. Kawazoe
    Physical Chemistry Chemical Physics 21 20 10744 - 10749 2019年05月 [査読有り][通常論文]
     
    The proton transport properties of 32 kinds of proton-conducting phosphate glasses with broad ranges of glass transition temperature, proton conductivity, and the proton carrier concentration were studied. Almost constant proton mobility of around 2 x 10(-8) cm(2) V-1 s(-1) at the glass transition temperature, corresponding to a diffusion coefficient of approximately 4 x 10(-10) cm(2) s(-1), was found for the glasses. The reason why the diffusion coefficient of protons is almost constant in various proton-conducting phosphate glasses was discussed based on the role of the protons as a cross-linker within the phosphate framework via hydrogen bonding. We evaluated the highest proton conductivity of the phosphate glasses and melts based on the almost constant mobility at their glass transition temperatures and obtained a highest expected proton conductivity of 7.5 x 10(-3) S cm(-1) at 300 degrees C. The potential of proton-conducting phosphate glasses as electrolytes in intermediate temperature fuel cells was also discussed.
  • 固体電気化学を利用したイオン制御による物質合成
    藤岡 正弥, 海住 英生, 西井 準治
    ケミカル・エンジニヤリング 64 57 - 63 2019年02月 [査読無し][通常論文]
  • Realization of Novel Nanoscale-Junction Devices Using Magnetic Thin-Film Edges
    H. Kaiju, M. Fujioka, J. Nishii
    IEEJ Journal 139 730 - 735 2019年 [査読有り][招待有り]
  • Room-temperature large magnetocapacitance effect in magnetic tunnel junctions
    H. Kaiju, T. Nagahama, O. Kitakami, J. Nishii, G. Xiao
    Bulletin of Topical Symposium of the Magnetics Society of Japan 224 7 - 13 2019年 [査読有り][招待有り]
  • D. Sakai, K. Harada, H. Shibata, K. Kawaguchi, J. Nishii
    PLOS ONE 14 1 e0210340 - e0210340 2019年01月 [査読有り][通常論文]
  • T. Yamaguchi, S. Tsukuda, T. Ishiyama, J. Nishii, T. Yamashita, H. Kawazoe, T. Omata
    Journal of Materials Chemistry A 6 46 23628 - 23637 2018年12月 [査読有り][通常論文]
     
    A working hypothesis to design proton-conducting phosphate glasses exhibiting high proton conductivity and high stability was proposed. In this hypothesis, the precursor glass before electrochemical alkali-proton substitution (APS) is required to fulfill the terms of (i) the concentration of NaO1/2 in the precursor glass needs to be higher than 35 mol%, (ii) the O/P ratio of the glass composition cannot exceed 3.5, (iii) the glass network modifier oxides need to consist of cations with low electronegativity, (iv) the glass must contain a sufficient amount of glass network modifiers and intermediate oxides, such as alkaline-earth oxides, Al2O3, Y2O3, La2O3, WO3, Nb2O5, and Ta2O5, (v) the glass needs to consist of more than four or five components, and (vi) the glass must contain a small amount of GeO2 and/or B2O3. Based on the proposed working hypothesis, we obtained a 36HO(1/2)-4NbO(5/2)-2BaO-4LaO(3/2)-4GeO(2)-1BO(3/2)-49PO(5/2) glass (36H-glass) by APS. While the glass transition temperature of 36H-glass was 179 degrees C, the glass, accurately the super cooled liquid, was stable for a long time up to 280 degrees C under fuel cell operating conditions and exhibited 1 x 10(-3) S cm(-1) at 280 degrees C, indicating that the developed working hypothesis is useful to design new proton-conducting electrolytes that work at intermediate temperatures.
  • Superconductivity in AgxTaS2 single crystals with stage structure obtained via proton-driven ion introduction.
    M. Fujioka, N. Kubo, R. MSISKA, N. Shirakawa, S. Demura, H. Sakata, H. Kaiju, J. Nishii
    Journal of the Ceramic Society of Japan 126 12 1 - 5 2018年12月 [査読有り][通常論文]
  • H. Kaiju, T. Misawa, T. Nagahama, T. Komine, O. Kitakami, M. Fujioka, J. Nishii, G. Xiao
    Scientific Reports 8 14709-1 - 14709-10 2018年10月 [査読有り][通常論文]
     
    One of the most important achievements in the field of spintronics is the development of magnetic tunnel junctions (MTJs). MTJs exhibit a large tunneling magnetoresistance (TMR). However, TMR is strongly dependent on biasing voltage, generally, decreasing with applying bias. The rapid decay of TMR was a major deficiency of MTJs. Here we report a new phenomenon at room temperature, in which the tunneling magnetocapacitance (TMC) increases with biasing voltage in an MTJ system based on Co40Fe40B20/Mgo/Co40Fe40B20 . We have observed a maximum TMC value of 102% under appropriate biasing, which is the largest voltage-induced TMC effect ever reported for MTJs. We have found excellent agreement between theory and experiment for the bipolar biasing regions using Debye-Frohlich model combined with quartic barrier approximation and spin-dependent drift-diffusion model. Based on our calculation, we predict that the voltage-induced TMC ratio could reach 1100% in MTJs with a corresponding TMR value of 604%. Our work has provided a new understanding on the voltage-induced AC spin-dependent transport in MTJs. The results reported here may open a novel pathway for spintronics applications, e.g., non-volatile memories and spin logic circuits.
  • Pressure-Induced Transition of Bisamide-Substituted Diacetylene Crystals from Nonphotopolymerizable to Photopolymerizable State
    Y. Kim, K. Aoki, M. Fujioka, J. Nishii, N. Tamaoki
    Applied Materials Interfaces 10 36407 - 36414 2018年10月 [査読有り][通常論文]
  • Magnetic response of random lasing modes in a ZnO nanoparticle film deposited on a NiFe thin film
    H. Fujiwara, H. Kaiju, J. Nishii, K. Sasaki
    Appl. Phys. Lett. 113 131108-1 - 131108-4 2018年09月 [査読有り][通常論文]
  • Catechol-Functionalized Polysiloxane Nanocoating for Surface Enhanced Raman Scattering on a Grating Surface
    Yida Liu, Ali Demirci, Hiroaki Ohara, Huie Zhu, Shunsuke Yamamoto, Akira Watanabe, Tokuji Miyashita, Keiko Tawa, Junji Nishii, Masaya Mitsuishi
    International Journal of the Society of Materials Engineering for Resources 23 84 - 87 2018年 [査読有り][通常論文]
  • Takuya Kinoshita, Atsushi Miyazaki, Keiga Kawaguchi, Daisuke Sakai, Takuya Yamaguchi, Takahisa Omata, Tomohiro Ishiyama, Masaya Fujioka, Hideo Kaiju, Junji Nishii
    APPLIED SURFACE SCIENCE 428 718 - 722 2018年01月 [査読有り][通常論文]
     
    Sodium ions in 25NaO(1/2)-6LaO(3/2)-6GeO(2)-63PO(5/2) (mol%) glasses were substituted with protons using corona discharge treatment (CDT) under a H-2 atmosphere. The substitution of sodium ion to proton proceeded from the anode side to the cathode side with con degrees stant current flow during the CDT. A crystalline free and transparent glass plate of 0.3 mm thickness was obtained after CDT for 96 h. The maximum decrease rate from sodium ion to proton was 78 +/- 10%. The proton conductivity of 8.5 x 10(-4) S/cm was attained at 400C. (C) 2017 Elsevier B.V. All rights reserved.
  • Satoshi Tsukuda, Keigo Miyake, Takuya Yamaguchi, Masao Kita, Tomohiro Ishiyama, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata
    INORGANIC CHEMISTRY 56 22 13949 - 13954 2017年11月 [査読有り][通常論文]
     
    The Sodium ions in Na3Zr2Si2PO12(NASTCON) were substituted with protons Using an electrochemical alkali-proton substitution (APS) technique at 400 degrees C under a 5% H-2/95% N-2 atmosphere. The sodium ions in NASICON were successfully substituted with proton to a depth,of <400 mu m from the anode. Completely protonated-NASICON, i.e., H3Zr2Si2PO12, was obtained to la depth <40 mu m from the, anode, although complete protoriation of NASICON cannot be achieved by ion exchange in aqueous acid H3Zr2Si2PO12 was amorphous, whereas the partially protonated NASICON was crystalline, and its unit cell volume decreased with an increase in the extent of substitution. Amorphous H3Zr2Si2PO12 was prepared by pressure-induced amorphization of the NASICON framework, in which an internal pressure of similar to 3.5 GPa was induced by the substitution of large sodium ions with small protons during APS at 400 degrees C.
  • Proton-Driven Intercalation and Ion Substitution Utilizing Solid-State Electrochemical Reaction
    M. Fujioka, C. Wu, N. Kubo, G. Zhao, A. Inoishi, S. Okada, S. Demura, H. Sakata, M. Ishimaru, H. Kaiju, J. Nishii
    J. Am. Chem. Soc. 139 17987 - 17993 2017年11月 [査読有り][通常論文]
  • Takuya Yamaguchi, Takuya Kataoka, Satoshi Tsukuda, Tomohiro Ishiyama, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata
    PHYSICAL CHEMISTRY CHEMICAL PHYSICS 19 43 29669 - 29675 2017年11月 [査読有り][通常論文]
     
    Proton conducting phosphate glasses were prepared by electrochemical substitution of sodium ions with protons applied to glasses with the compositions xNaO(1/2)-1WO(3)-8NbO(5/2)-5LaO(3/2)-(86 - x) PO5/2 (x = 28, 32, 35, 38, and 40). The mobilities of proton carriers in the glasses were studied in terms of the polymerization degree of the phosphate framework. The proton mobility at 200 degrees C increased as the depolymerization of the phosphate framework developed up to x = 38, and decreased at x = 40. On the basis of Raman and infrared spectra measurements of the O-H stretching vibration region, the decreasing mobility at x > 38 was attributed to the increasing concentration of protons trapped by non-bridging oxygen in P2O74- ions, owing to strong O-H bonding. We found that the highly polymerized phosphate framework decreased the mobility of proton carriers, not because of suppression of the proton dissociation from oxygen atoms but rather the suppression of the proton migration. The compositions at which the phosphate framework was sufficiently depolymerized and did not contain P2O74- ions as a main component, achieved high mobility of proton carriers in phosphate glasses.
  • Weibai Bian, Yuanqing Chen, Wenhuang Huang, Gaoyang Zhao, Junji Nishii, Hideo Kaiju, Masaya Fujioka, Lingwei Li, Na Li, Fuxue Yan
    CERAMICS INTERNATIONAL 43 11 8433 - 8439 2017年08月 [査読有り][通常論文]
     
    YBa2Cu3O7-x (YBCO) thin films (with thickness of 220-230 nm) and thick films (with thickness of 1.1-1.2 mu m) were prepared using low fluorine solutions with different F/Ba ratios (F/Ba=1-4.5). The effect of F/Ba ratio on the properties of the films was systematically investigated. The results showed that films derived from solutions with F/Ba < 2, regardless of whether they were thin or thick, showed poor superconductivity due to the formation of BaCO3 intermediate phase. When solutions with F/Ba >= 2 were used, the superconductivity of as-prepared YBCO films was related to not only the film thickness, but also the F/Ba ratio in the solution. It was found that, for thick films derived from F/Ba > 2 solutions, the formation of BaF2/BaOF phase was retarded by the decomposition of Ba1-xYxF2+x (BYF) intermediate phase. We also found that extra fluorine in the solution resulted in a large number of impurities and a-axis grains in the thick films, degrading the film superconductivity. F/Ba=2 was the optimal ratio in the solution to fabricate high-J(c) YBCO thick films.
  • Chuanbao Wu, Gaoyang Zhao, Junji Nishii, Li Lei, Zongfan Duan
    JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM 30 7 1719 - 1725 2017年07月 [査読有り][通常論文]
     
    Trilayer films of YBa2Cu3 O (7-x) (YBCO)/Y-2 O (3)/ YBCO were prepared on LaAlO3 (100) single-crystal substrates using sol-gel method. The results indicated that both the YBCO and the Y-2 O (3) films in the trilayer exhibited remarkable biaxial texture characteristics. The epitaxial relationship between the Y-2 O (3) and YBCO films was < 001 > Y-2 O (3)a<yen> < 001 > YBCO, < 110 > Y-2 O (3)a<yen> < 100 > YBCO, and the interface of both films was well-defined. The top and bottom YBCO layers in the trilayer exhibited zero resistance at 88 K. When the nominal thickness of the Y-2 O (3) interlayer in the trilayer was 180 nm, the V - I curve was linear, and the resistivity between the two YBCO layers was 2.5 x 10(6) Omega cm. These results demonstrated that YBCO/Y-2 O (3)/YBCO trilayer could be realized using the sol-gel method, which is inexpensive and easy to scale up.
  • 100年にわたる超伝導物質探索の営み―高圧合成の可能性
    藤岡正弥, 海住 英生, 西井 準治
    化学同人 72 8 64 - 65 2017年07月 [査読無し][通常論文]
  • Hideo Kaiju, Taro Nagahama, Shun Sasaki, Toshihiro Shimada, Osamu Kitakami, Takahiro Misawa, Masaya Fujioka, Junji Nishii, Gang Xiao
    SCIENTIFIC REPORTS 7 2682-1 - 2682-12 2017年06月 [査読有り][通常論文]
     
    Magnetocapacitance (MC) effect, observed in a wide range of materials and devices, such as multiferroic materials and spintronic devices, has received considerable attention due to its interesting physical properties and practical applications. A normal MC effect exhibits a higher capacitance when spins in the electrodes are parallel to each other and a lower capacitance when spins are antiparallel. Here we report an inverse tunnel magnetocapacitance (TMC) effect for the first time in Fe/AlOx/Fe3O4 magnetic tunnel junctions (MTJs). The inverse TMC reaches up to 11.4% at room temperature and the robustness of spin polarization is revealed in the bias dependence of the inverse TMC. Excellent agreement between theory and experiment is achieved for the entire applied frequency range and the wide bipolar bias regions using Debye-Frohlich model (combined with the Zhang formula and parabolic barrier approximation) and spin-dependent drift-diffusion model. Furthermore, our theoretical calculations predict that the inverse TMC effect could potentially reach 150% in MTJs with a positive and negative spin polarization of 65% and -42%, respectively. These theoretical and experimental findings provide a new insight into both static and dynamic spin-dependent transports. They will open up broader opportunities for device applications, such as magnetic logic circuits and multi-valued memory devices.
  • Takuya Yamaguchi, Yasuhisa Saito, Yasutaka Kuwahara, Hiromi Yamashita, Tomohiro Ishiyama, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata
    JOURNAL OF MATERIALS CHEMISTRY A 5 24 12385 - 12392 2017年06月 [査読有り][通常論文]
     
    In this work, the effect of alkaline-earth species used in phosphate glasses on the mobility of proton carriers was investigated. Initially, 35NaO(1/2)-5RO-3NbO(5/2)-3LaO(3/2)-2GeO(2)-2BO(3/2)-50PO(5/2) (R: Mg and Ba) glasses were subjected to the electrochemical substitution of Na+ ions with H+ at intermediate temperatures, producing proton conductors with high proton carrier concentrations (>8 x 10(21) cm(-3)). The mobility of the proton carriers in the Ba glass was higher than that in the Mg glass. We studied the origin of this phenomenon in terms of the O-H and P-O bonding features using infrared spectroscopy and X-ray photoelectron spectroscopy, respectively. The higher mobility of proton carriers in Ba glass was attributed to weaker O-H bonding, which originated from the highly ionic character of Ba-O bonding compared with the comparatively covalent Mg-O bonding. Our findings indicate that a higher mobility of proton carriers can be achieved for glasses containing less electronegative glass network modifiers. The application of this strategy would be beneficial for the development of proton-conducting glass electrolytes for intermediate-temperature fuel cells.
  • Weibai Bian, Yuanqing Chen, Xinni Tang, Junji Nishii, Lingwei Li, Na Li, Huimin Wu, Gaoyang Zhao
    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 82 2 586 - 593 2017年05月 [査読有り][通常論文]
     
    La2Zr2O7 (LZO) films and CeO2/LZO composite films were prepared on the biaxially textured NiW tapes using metal organic deposition method. Effect of molar ratio of La/Zr in the precursor solution on the texture and surface morphology of LZO films and composite CeO2/LZO films was investigated systemically. It was found that the content of lanthanum played an important role in the orientation control of the LZO film. Finally, the LZO film with ratio of La/Zr = 1.1/1 was obtained with the best properties as compared to others. And highly textured LZO-11 and CeO2/LZO-11 films with smooth surface were obtained on the NiW tape. YBa2Cu3O7-x (YBCO) films with enhanced critical current density (J(c)) were obtained on the optimized CeO2/LZO buffer layer. The LZO films were prepared from different LZO solutions with different molar ratio of La/Zr, and the effects of the La/Zr ratio on the texture and surface morphology of LZO films were systemically investigated. The results confirmed that the content of lanthanum in solution was closely related to the orientation control of the LZO film. When the ratio of La/Zr was smaller than La/Zr = 1, the pure (l00)-oriented phase was not achieved. When that was larger than La/Zr = 1.2, in spite of the pure (l00)-oriented phase, the more lanthanum content increased the lattice parameter of the LZO films. In summary, the ratio of La/Zr = 1.1 was the optimized ratio for the fabrication of LZO film due to the best texture and surface morphology. [GRAPHICS] .
  • Naoki Kubo, Naoki Ikutame, Masashi Takei, Bian Weibai, Sadatatsu Ikeda, Kiyoshi Yamamoto, Keiichiro Uraji, Takahiro Misawa, Masaya Fujioka, Hideo Kaiju, Gaoyang Zhao, Junji Nishii
    Optical Materials Express 7 5 1438 - 1445 2017年04月03日 [査読有り][通常論文]
     
    One-dimensional gratings of 700-nm period were imprinted on a sodaaluminosilicate glass (NAS) and a soda-lime silicate glass (NCS) using a platinum-coated SiO2 mold with application of DC voltage. The migration of network modifier cations below the anode side surface to the cathode side is a necessary condition for grating formation. Glass surfaces were chemically etched using a 55% KOH solution at 70°C. The top area of the NAS grating ridge, where the non-contacted area of the mold is located, was etched preferentially. Finally, the reverse concavo-convex grating appeared by etching. Localized stress corrosion in the grating ridge is expected to be an origin of the anisotropic etching and the grating pattern formation. In contrast, such anomalous etching behavior was not observed for the NCS. The bottom of the grating groove, the mold contacted area, was etched monotonously, maintaining the initial sinusoidal grating shape.
  • Itsunari Yamada, Naoto Yamashita, Toshihiko Einishi, Mitsunori Saito, Kouhei Fukumi, Junji Nishii
    Infrared Physics and Technology 64 13 - 17 2017年03月01日 [査読有り][通常論文]
     
    An infrared wire-grid polarizer with an antireflection (AR) grating structure was fabricated using direct imprint lithography on both sides of a low toxicity chalcogenide glass (Sb-Ge-Sn-S system) simultaneously. The AR grating structure was designed using rigorous coupled-wave analysis theory. Silicon carbide with a grating period of 500 nm and glassy carbon with a grating period of 3 μm were employed as molds. After imprinting, a wire-grid polarizer was made by depositing Al obliquely on the grating. The transverse magnetic (TM) transmittance of the fabricated polarizer was over 70% at 8.5-10.5 μm wavelength, although the transmittance of the glass substrate is 62-66%, and the extinction ratio was over 20 dB at 11 μm wavelength. The polarizer has a high TM transmittance and is cheaper and simpler to fabricate as compared with conventional infrared polarizers. © 2014 Elsevier B.V. All rights reserved.
  • Itsunari Yamada, Naoto Yamashita, Toshihiko Einishi, Mitsunori Saito, Kouhei Fukumi, Junji Nishii
    INFRARED PHYSICS & TECHNOLOGY 81 339 - 339 2017年03月 [査読有り][通常論文]
  • AJIRI Taiga, KASA Haruya, MAEKI Masatoshi, ISHIDA Akihiko, TANI Hirofumi, NISHII Junji, TOKESHI Manabu
    Analytical Sciences 33 10 1197 - 1199 社団法人 日本分析化学会 2017年 
    Recently, we developed a label-free detection method based on optical diffraction, and implemented it in on our fabricated micro- and nanofluidic device. This detection method is simple and useful for detecting biomolecules, but the device fabrication consists of complicated processes. In this paper, we propose a simple method for fabricating the micro- and nanofluidic device; the fabrication combines laser interference lithography with conventional photolithography. The performance of a device fabricated by the proposed method is comparable to the performance of the device in our previous study.
  • Takahiro Misawa, Sumito Mori, Takashi Komine, Masaya Fujioka, Junji Nishii, Hideo Kaiju
    APPLIED SURFACE SCIENCE 390 666 - 674 2016年12月 [査読有り][通常論文]
     
    We investigate the structural and magnetic properties of Ni78Fe22 thin films sandwiched between low softening-point (LSP) glasses, which can be used in spin quantum cross (SQC) devices utilizing stray magnetic fields generated from magnetic thin-film edges. We also calculate the stray magnetic field generated between the two edges of Ni78Fe22 thin-film electrodes in SQC devices and discuss the applicability to spin-filter devices. Using the established fabrication technique, we successfully demonstrate the formation of LSP-glass/Ni78Fe22/LSP-glass structures with smooth and clear interfaces. The coercivity of the Ni78Fe22 thin films is enhanced from 0.9 to 103 Oe by increasing the applied pressure from 0 to 1.0 MPa in the thermal pressing process. According to the random anisotropy model, the enhancement of the coercivity is attributed to the increase in the crystal grain size. The stray magnetic field is also uniformly generated from the Ni78Fe22 thin-film edge in the direction perpendicular to the cross section of the LSP-glass/Ni78Fe22/LSP-glass structures. Theoretical calculation reveals that a high stray field of approximately 5 kOe is generated when the distance between two edges of the Ni78Fe22 thin-film electrodes is less than 5 nm and the thickness of Ni78Fe22 is greater than 20 nm. These experimental and calculation results indicate that Ni78Fe22 thin films sandwiched between LSP glasses are useful as electrodes for SQC devices, serving as spin-filter devices. (C) 2016 Elsevier B.V. All rights reserved.
  • Sadatatsu Ikeda, Keiichiro Uraji, Toshio Suzuki, Kiyoshi Yamamoto, Junji Nishii
    JOURNAL OF NON-CRYSTALLINE SOLIDS 453 103 - 107 2016年12月 [査読有り][通常論文]
     
    One dimensional pattern of 500 nm period was formed on a soda-lime silicate glass by the electrical nanoimprint below the glass transition temperature. The imprinted glass surface was analyzed using a transmission electron microscopy and an energy-dispersive X-ray spectroscopy with the cryogenic system. The concentrated parabolic layers of Ca2+ and Mg2+ me were formed separately in the Na+ deficient layer. The deficient area both of such alkali and alkaline-earth cations was preferentially removed in an alkali etchant, resulting the enhancement of the aspect ratio of the one-dimensional relief pattern. Therefore, the distribution control of alkaline-earth cations was important for the fabrication of sub-micron scale patterns with high aspect ratio on the glass surface. (C) 2016 Elsevier B.V. All rights reserved.
  • Toshio Suzuki, Junko Anzai, Yasuyuki Takimoto, Keiichiro Uraji, Kiyoshi Yamamoto, Junji Nishii
    JOURNAL OF NON-CRYSTALLINE SOLIDS 452 125 - 129 2016年11月 [査読有り][通常論文]
     
    X-ray photoelectron spectroscopy with C-60-ion sputtering (C-60-XPS) and electron spin resonance (ESR) revealed the migration behavior of network-modifier cations in an electrically poled soda-lime silicate glass. The Na+-deficient layer of 700-nm thickness was confirmed at the anode side surface. The Mg2+ and Ca2+ existed in the 200-nm thick layer from the top surface were concentrated in the layer of 200-700 nm depth from the surface. Additionally the oxygen content in the 200-nm thick layer decreased by the degassing as oxygen molecules from the glass surface, which is an essential requirement for the migration of Mg2+ and Ca2+ to cathode side. The bond scission between Si-O-Si is caused by the concentrated Mg2+ and Ca2+, resulting the formation of SiO- (Mg2+ or Ca2+)(-) OSi and Si center dot (Si E' center). We have also confirmed the generation of oxygen hole center (NBOHC) and peroxy radical (POR) in the electrically poled soda-lime silicate glass. (C) 2016 Elsevier B.V. All rights reserved.
  • Junji Nishii
    Optics InfoBase Conference Papers 2016年08月29日 [査読有り][通常論文]
     
    Cation migration according to a voltage gradient can be applicable not only to the nonlinear optics but also to grating formation on glasses below their glass transition temperatures. This paper reports the relationship between the cation diffusion characteristics and the grating formation by the DC voltage application using a contact electrode with periodic fine pattern.
  • Hiroshi Ikeda, Haruya Kasa, Junji Nishii
    MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS 22 8 2087 - 2091 2016年08月 [査読有り][通常論文]
     
    This paper presents the effect of mold stiffness on the surface flatness of mold-pressed glass for glass molding and imprint processes. Phosphate and borosilicate glasses were pressed at their viscoelastic temperature region using flat molds of several kinds and subsequently cooled to room temperature. Surface flatness of the mold-pressed glasses was examined using a stylus surface profilometer. The glass surface curvature was observed after spontaneous demolding by thermal shrinkage stress of the glass and the mold during cooling. The curvature decreased with increasing mold stiffness, as determined by the Young's modulus and mold thickness. The curvature also decreased with decreasing cooling rate during cooling, which was discussed in terms of the glass fragility. It was demonstrated that the Young's modulus, mold thickness, and cooling rate are key factors for the control of the molded glass surface flatness.
  • Daisuke Sakai, Kenji Harada, Yuichiro Hara, Hiroshi Ikeda, Shiro Funatsu, Keiichiro Uraji, Toshio Suzuki, Yuichi Yamamoto, Kiyoshi Yamamoto, Naoki Ikutame, Keiga Kawaguchi, Hideo Kaiju, Junji Nishii
    SCIENTIFIC REPORTS 6 27767 1 - 7 2016年06月 [査読有り][通常論文]
     
    Selective deposition of SiO2 nanoparticles was demonstrated on a soda-lime glass surface with a periodic sodium deficient pattern formed using the electrical nanoimprint. Positively charged SiO2 particles generated using corona discharge in a cyclic siloxane vapor, were selectively deposited depending on the sodium pattern. For such phenomena to occur, the sodium ion migration to the cathode side was indispensable to the electrical charge compensation on the glass surface. Therefore, the deposition proceeded preferentially outside the alkali-deficient area. Periodic SiO2 structures with 424 nm and 180 nm heights were obtained using one-dimensional (6 mu m period) and two-dimensional (500 nm period) imprinted patterns.
  • Takuya Yamaguchi, Tomohiro Ishiyama, Kanji Sakuragi, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Naoaki Kuwata, Junichi Kawamura, Takahisa Omata
    SOLID STATE IONICS 288 281 - 285 2016年05月 [査読有り][通常論文]
     
    Using Raman and P-31 magic-angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopies, we studied the structural changes in 35NaO(1/2)-1WO(3)-8NbO(5/2)-5LaO(3/2)-51PO(5/2) glass upon introducing Al2O3 and/or Y2O3 in order to understand the reduced mobility of proton carriers in glasses with Al2O3 and/or Y2O3 in which proton carriers were injected by alkali -proton substitution (APS). The Raman and 31P MAS-NMR spectra showed that phosphate chains were shortened by the Al2O3 and/or Y2O3 introduced into 1W glass. This structural change increased the fraction of protons bound to oxygen atoms in the terminal PO4 (i.e., the Q(1) unit) of the phosphate chains. Because the protons bound to terminal Q(1) units in phosphate chains tightly bind to oxygen atoms, as opposed to the protons bound to inner Q(2) units in phosphate chains, we attributed the reduced mobility of proton carriers upon introducing AlO3/2 and/or YO3/2 into 1W glass to the shortening of phosphate chains. From these results we propose that to obtain a highly proton-conducting glass after APS, the glass must have a composition of O/P <3.5 and thus a sufficiently high fraction of Q(2) units. (C) 2016 Elsevier B.V. All rights reserved.
  • Keiko Tawa, Chisato Sasakawa, Tsuyoshi Fujita, Kazuyuki Kiyosue, Chie Hosokawa, Junji Nishii, Makoto Oike, Norihiro Kakinuma
    JAPANESE JOURNAL OF APPLIED PHYSICS 55 3 03DF12-1 - 03DF12-5 2016年03月 [査読有り][通常論文]
     
    A plastic dish with a wavelength-scale periodic structure at a bottom panel was integrally molded and coated with thin metal films. The integrally molded dish called plasmonic dish was applied to bioimaging under a fluorescence microscope. On the plasmonic substrate, the enhanced electric field based on a grating-coupled surface plasmon resonance (GC-SPR) can provide an enhanced fluorescence. In this study, two kinds of cells, human embryonic kidney (HEK) cells and neuronal cells, were observed in our plasmonic dish. Fluorescence images of HEK cells were above 10 times brighter than those obtained on a conventional glass-bottomed dish. Neuronal cells were successfully cultured for 10 d on the plasmonic dish integrally molded, and in fluorescence images with transmitted light, a higher contrast was obtained than in epifluorescence images. The plasmonic dish integrally molded, as well as that fabricated by the UV nanoimprint method, was also found to be useful for sensitive bioimaging. (C) 2016 The Japan Society of Applied Physics
  • Masaya Fujioka, Manabu Ishimaru, Taizo Shibuya, Yoichi Kamihara, Chihiro Tabata, Hiroshi Amitsuka, Akira Miura, Masashi Tanaka, Yoshihiko Takano, Hideo Kaiju, Junji Nishii
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 138 31 9927 - 9934 2016年 [査読有り][通常論文]
  • Hideo Kaiju, Masashi Takei, Takahiro Misawa, Taro Nagahama, Junji Nishii, Gang Xiao
    APPLIED PHYSICS LETTERS 107 13 132405-1 - 132405-5 2015年09月 [査読有り][通常論文]
     
    The frequency dependence of tunneling magnetocapacitance (TMC) in magnetic tunnel junctions (MTJs) is investigated theoretically and experimentally. According to the calculation based on Debye-Frohlich model combined with Julliere formula, the TMC ratio strongly depends on the frequency and it has the maximum peak at a specific frequency. The calculated frequency dependence of TMC is in good agreement with the experimental results obtained in MgO-based MTJs with a tunneling magnetoresistance (TMR) ratio of 108%, which exhibit a large TMC ratio of 155% at room temperature. This calculation also predicts that the TMC ratio can be as large as about 1000% for a spin polarization of 87%, while the TMR ratio is 623% for the same spin polarization. These theoretical and experimental findings provide a deeper understanding on AC spin-dependent transport in the MTJs and will open up wider opportunities for device applications, such as highly sensitive magnetic sensors and impedance-tunable devices. (C) 2015 AIP Publishing LLC.
  • Euichi Hirose, Daisuke Sakai, Tomohiro Shibata, Junji Nishii, Hiroyuki Mayama, Akihiro Miyauchi, Jun Nishikawa
    JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM 95 5 1025 - 1031 2015年08月 [査読有り][通常論文]
     
    The salp Thalia rhomboides is distributed in the shallow depths during the day, and is thus at increased risk of predation by visual predators and from the damaging effects of ultraviolet (UV) radiation compared with species distributed in deeper layers in the daytime. The integument (tunic) of T. rhomboides may have adaptive optical properties, but the absorption spectra of the unfixed tunic demonstrate that the tunic transmits UV as well as visible light, indicating that the tunic is not an effective barrier against UV radiation. Ultrastructural observation revealed that the surface of the tunic cuticle is covered in a nipple array consisting of hemispherical protuberances approximately 40 and 30 nm in diameter in solitary and aggregate zooids, respectively. Simulation of light reflection of a nipple array using rigorous coupled wave analysis (RCWA) indicated that the reflection is slightly lower for the nipple array than for a flat surface at high angles of incidence (theta > 80 degrees). This result supports the idea that the nipple array serves to make the salp less visible. The simulation also indicated that the height and distribution of the salp nipple array do not have an optimal structure for causing an antireflection effect. A mechanical restriction might exist on the structures, and the nipple array could also serve another function. The size and distribution of nipples may be controlled by the need to meet the complex requirements of multiple essential functions.
  • Takuya Yamaguchi, Tomohiro Ishiyama, Kanji Sakuragi, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Takahisa Omata
    SOLID STATE IONICS 275 62 - 65 2015年07月 [査読有り][通常論文]
     
    We investigated electrochemical substitution involving the electrochemical oxidation of hydrogen with proton injection into an oxide glass. This was accompanied by the electrochemical reduction of sodium ions and the discharge of metallic sodium out of the glass. This is referred to as the alkali-proton substitution technique and we applied it to a sodium-containing phosphate glass. The thermal stability of the 1WO(3)-35NaO(1/2)-8NbO(5/2)-5LaO(3/2)-51PO(5/2) glass that previously deformed at >250 degrees C improved to 350 degrees C after alkali-proton substitution technique by the introduction of AlO3/2 and/or YO3/2. However, the mobility of the proton carriers decreased by 1/20-1/50 by the introduction of AlO3/2 and/or YO3/2 while the thermal stability improved. Based on infrared absorption spectra the reduced mobility can be attributed to the increase in protons that are tightly bound to oxygen by weak hydrogen bondings. (C) 2015 Elsevier B.V. All rights reserved.
  • H. Kaiju, H. Kasa, T. Komine, S. Mori, T. Misawa, T. Abe, J. Nishii
    JOURNAL OF APPLIED PHYSICS 117 17 17C738-1 - 17C738-4 2015年05月 [査読有り][通常論文]
     
    We investigate the Co thickness dependence of the structural and magnetic properties of Co thin-film electrodes sandwiched between borate glasses in spin quantum cross (SQC) devices that utilize stray magnetic fields. We also calculate the Co thickness dependence of the stray field between the two edges of Co thin-film electrodes in SQC devices using micromagnetic simulation. The surface roughness of Co thin films with a thickness of less than 20 nm on borate glasses is shown to be as small as 0.18 nm, at the same scanning scale as the Co film thickness, and the squareness of the hysteresis loop is shown to be as large as 0.96-1.0. As a result of the establishment of polishing techniques for Co thin-film electrodes sandwiched between borate glasses, we successfully demonstrate the formation of smooth Co edges and the generation of stray magnetic fields from Co edges. Theoretical calculation reveals that a strong stray field beyond 6 kOe is generated when the Co thickness is greater than 10 nm at a junction gap distance of 5 nm. From these experimental and calculation results, it can be concluded that SQC devices with a Co thickness of 10-20 nm can be expected to function as spin-filter devices. (C) 2015 AIP Publishing LLC.
  • Keiga Kawaguchi, Toshio Suzuki, Hiroshi Ikeda, Daisuke Sakai, Shiro Funatsu, Keiichiro Uraji, Kiyoshi Yamamoto, Kenji Harada, Junji Nishii
    APPLIED SURFACE SCIENCE 338 338 120 - 125 2015年05月 [査読有り][通常論文]
     
    Corona discharge reflects the spatial migration of alkali ions over a gap between two glass plates. This study examined stacked glass plates containing different alkali ions treated with the corona discharge plasma generated by applied voltage of 4.5 kV at 200 degrees C. Protons generated at the anode electrode penetrate into the potassium-ion-containing upper glass plate, which is located 5 mm below the anode electrode. Potassium ions intruded into the lower glass plate containing sodium ions placed on the cathode electrode, even over a 1 mm gap separating the plates. Finally, the sodium ion discharged on the cathode electrode. The hydrogen atmosphere was effective at inhibiting the potassium ion reaction with ambient gases during the spatial migration between the two glass plates. (C) 2015 Elsevier B.V. All rights reserved.
  • H. Kaiju, H. Kasa, T. Komine, S. Mori, T. Misawa, T. Abe, J. Nishii
    JOURNAL OF APPLIED PHYSICS 117 17 2015年05月 [査読有り][通常論文]
     
    We investigate the Co thickness dependence of the structural and magnetic properties of Co thin-film electrodes sandwiched between borate glasses in spin quantum cross (SQC) devices that utilize stray magnetic fields. We also calculate the Co thickness dependence of the stray field between the two edges of Co thin-film electrodes in SQC devices using micromagnetic simulation. The surface roughness of Co thin films with a thickness of less than 20 nm on borate glasses is shown to be as small as 0.18 nm, at the same scanning scale as the Co film thickness, and the squareness of the hysteresis loop is shown to be as large as 0.96-1.0. As a result of the establishment of polishing techniques for Co thin-film electrodes sandwiched between borate glasses, we successfully demonstrate the formation of smooth Co edges and the generation of stray magnetic fields from Co edges. Theoretical calculation reveals that a strong stray field beyond 6 kOe is generated when the Co thickness is greater than 10 nm at a junction gap distance of 5 nm. From these experimental and calculation results, it can be concluded that SQC devices with a Co thickness of 10-20 nm can be expected to function as spin-filter devices. (C) 2015 AIP Publishing LLC.
  • Tomohiro Ishiyama, Takuya Yamaguchi, Junji Nishii, Toshiharu Yamashita, Hiroshi Kawazoe, Naoaki Kuwata, Junichi Kawamura, Takahisa Omata
    PHYSICAL CHEMISTRY CHEMICAL PHYSICS 17 20 13640 - 13646 2015年 [査読有り][通常論文]
     
    Structural changes of 35NaO(1/2)-1WO(3)-8NbO(5/2)-5LaO(3/2)-51PO(5/2) glass (1W-glass) before and after the electrochemical substitution of sodium ions with protons by alkali-proton substitution (APS) are studied by Raman and P-31 magic-angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopies. The glass before APS consists of (PO3-)(8.6)(P2O74-) chains on average and the terminal Q(1) units (-O-PO33-) are bound to MO6 octahedra (M denotes niobium or tungsten) through P-O-M bonds. Some nonbridging oxygens (NBOs) in the MO6 octahedra are present in addition to the bridging oxygens (BOs) in P-O-M bonds. APS induces fragmentation of the phosphate chains because the average chain length decreases to (PO3-)(3.7)(P2O74-) after APS, despite the total number of modifier cations of sodium and lanthanum ions and protons being unaffected by APS. This fragmentation is induced by some of the NBOs in the MO6 octahedra before APS, changing to BOs of the newly formed M-O-P bonds after APS, because of the preferential formation of P-OH bonds over M-OH ones in the present glass. We show that APS under the conditions used here is not a simple substitution of sodium ions with protons, but it is accompanied by the structural relaxation of the glass to stabilize the injected protons.
  • Keiga Kawaguchi, Takuya Yamaguchi, Takahisa Omata, Toshiharu Yamashita, Hiroshi Kawazoe, Junji Nishii
    PHYSICAL CHEMISTRY CHEMICAL PHYSICS 17 35 22855 - 22861 2015年 [査読有り][通常論文]
     
    Electrochemical substitution of sodium ions with protons (alkali-proton substitution; APS), and the injection of proton carriers was applied to sodium lanthanum phosphate glasses. A clear and homogeneous material was obtained for a glass of composition 25NaO(1/2)-8LaO(3/2)-66PO(5/2)-1GeO(2) following APS, with a resulting proton conductivity of 4 x 10(-6) S cm(-1) at 250 degrees C. The glass underwent phase separation and crystallization at temperatures > 255 degrees C, forming a highly hygroscopic and proton conducting H3PO4 phase in addition to LaP5O14 and other unidentified phases. A glass of composition 25NaO(1/2)-8LaO(3/2)-67PO(5/2) underwent phase separation and crystallization during APS, forming both H3PO4 and LaP5O14 phases. Sodium lanthanum phosphate glasses are prone to phase separation and crystallization during APS unlike the previously reported NaO1/2-WO3-NbO5/2-LaO3/2-PO5/2 glasses. The phase separation was explained by a reduction in viscosity following APS and the introduction of protons, which exhibit high field strength. Thus, phase separation and crystallization of glasses during APS was difficult to avoid. An approach to suppress phase separation is discussed.
  • Yutaka Yoshida, Seiichi Watanabe, Hideo Kaiju, Junji Nishii, Kyosuke Yoshimi
    JOURNAL OF APPLIED PHYSICS 117 4 045305-1 - 45305-5 2015年01月 [査読有り][通常論文]
     
    We investigate the laser wavelength dependence of structural and magnetic transitions on the surface of an iron-aluminum (FeAl) alloy induced by nanosecond pulsed laser irradiation. The formation of self-organized FeAl stripes with a wavelength-dependent period is observed in a local area on the (111)-oriented plane. Focused magneto-optical Kerr effect measurements reveal that the coercivity reaches up to 1.2 kOe with increasing the magnetic field rotation angle, which is estimated from the stripe direction, in FeAl stripes irradiated at 355 nm, and its magnetization reversal can be explained by the domain-wall motion model. On the other hand, the magnetization reversal agrees with the Stoner-Wohlfarth model in FeAl stripes irradiated at 1064 nm. This magnetic transition originates from the B2-to-A2 phase transition in stripe structures and bulk regions. These results indicate that the magnetic transition from the incoherent to coherent mode as well as the structural transformation of stripe patterns can be controlled by the incident laser wavelength. (C) 2015 AIP Publishing LLC.
  • Tawa K, Yasui C, Hosokawa C, Aota H, Nishii J
    ACS applied materials & interfaces 6 22 20010 - 20015 22 2014年11月 [査読有り][通常論文]
     
    © 2014 American Chemical Society. A plasmonic dish was fabricated as a novel cellculture dish for in situ sensitive imaging applications, in which the cover glass of a glass-bottomed dish was replaced by a grating substrate coated with a film of silver. Neuronal cells were successfully cultured over a period of more than 2 weeks in the plasmonic dish. The fluorescence images of their cells including dendrites were simply observed in situ using a conventional fluorescence microscope. The fluorescence from neuronal cells growing along the dish surface was enhanced using the surface plasmon resonance field. Under an epi-fluorescence microscope and employing a donut-type pinhole, the fluorescence intensity of the neuron dendrites was found to be enhanced efficiently by an order of magnitude compared with that using a conventional glass-bottomed dish. In a transmitted-light fluorescence microscope, the surface-selective fluorescence image of a fine dendrite growing along the dish surface was observed; therefore, the spatial resolution was improved compared with the epi-fluorescence image of the identical dendrite. (Chemical Equation Presented).
  • T. Ishiyama, S. Suzuki, J. Nishii, T. Yamashita, H. Kawazoe, T. Omata
    SOLID STATE IONICS 262 856 - 859 2014年09月 [査読有り][通常論文]
     
    High concentrations of proton carriers (5.0 x 10(21) cm(-3)) were injected into tungsten phosphate glass (8WO(3)-35NaO(1/2)-8NbO(5/2)-5LaO(3/2)-44PO(5/2)) by electrochemical substitution of sodium ions with protons at 345 degrees C. The electromotive force of a hydrogen concentration cell that used the substituted glass as a solid electrolyte indicated a mixed conduction of protons and electrons in the glass with a mean proton transport number of 0.8 at 300 degrees C The partial conductivity of,the protons was 8.0 x 10(-4) Scm(-1). The fuel cell generated electricity at a maximum power density of 1.3 mWcm(-2), even though its open circuit voltage was only 0.77 V because of the electronic contribution to the conductivity. Methods to increase the proton conductivity for improving fuel cell performance are discussed. (C) 2013 Elsevier B.V. All rights reserved.
  • Keiko Tawa, Tsuyoshi Fujita, Chikara Yasui, Kazuyuki Kiyosue, Chie Hosokawa, Chisato Sasakawa, Hiroyuki Aota, Norihiro Kakinuma, Makoto Oike, Junji Nishii
    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY 248 2014年08月 [査読有り][通常論文]
  • Takaaki Ishihara, Itsunari Yamada, Junichi Yanagisawa, Junji Nishii, Mitsunori Saito
    JAPANESE JOURNAL OF APPLIED PHYSICS 53 6 2014年06月 [査読有り][通常論文]
     
    We fabricated a deformable transmission grating with a silicone elastomer [poly(dimethylsiloxane)], and evaluated its optical characteristics during a compression process. This grating pattern was created on a silicone surface by a polymer mold that had been fabricated by photo-imprinting process with an SiC mold to realize a simple, low-cost fabrication process. We also measured the relationship between the grating period and compressive stress to the fabricated elements. The grating periods of the fabricated elements were evaluated from the measured diffraction angles. The grating periods of 3.02 and 410nm were changed to 2.86 m pitch and to 368nm pitch, respectively, by compressing the fabricated element in one direction, perpendicular to the grooves. (C) 2014 The Japan Society of Applied Physics
  • Hideo Kaiju, Haruya Kasa, Takashi Komine, Taro Abe, Takahiro Misawa, Junji Nishii
    Earth and Environmental Science Transactions of the Royal Society of Edinburgh 1708 4 vv0910 - vv09106 2014年05月19日 [査読有り][通常論文]
     
    We investigate structural and magnetic properties of Co thin-film electrodes used in a new type of spin quantum cross (SQC) devices, in which a strong stray magnetic field could be generated between the both edges of magnetic thin-film electrodes. We also calculate the stray field between the two edges of Co thin-film electrodes in SQC devices and discuss the possibility to novel spintronics devices. As a result of magnetic force microscopy (MFM) observations, the stray fields are generated from the Co edges, and they are uniformly distributed. This result indicates that magnetic single-domain structures can be formed. This is consistent with the result obtained by magneto-optical Kerr effect (MOKE). The theoretical calculation reveals that the stray field exhibits as high as 7000 Oe under the condition that the distance between the two Co edges is 5 nm and the Co thickness is 19 nm. These results indicate that SQC devices utilizing stray fields can be expected as novel spintronics devices, such as spin filtering devices and beyond CMOS switching devices.
  • Itsunari Yamada, Naoto Yamashita, Toshihiko Einishi, Mitsunori Saito, Kouhei Fukumi, Junji Nishii
    INFRARED PHYSICS & TECHNOLOGY 64 13 - 17 2014年05月 [査読有り][通常論文]
     
    An infrared wire-grid polarizer with an antireflection (AR) grating structure was fabricated using direct imprint lithography on both sides of a low toxicity chalcogenide glass (Sb-Ge-Sn-S system) simultaneously. The AR grating structure was designed using rigorous coupled-wave analysis theory. Silicon carbide with a grating period of 500 nm and glassy carbon with a grating period of 3 mu m were employed as molds. After imprinting, a wire-grid polarizer was made by depositing Al obliquely on the grating. The transverse magnetic (TM) transmittance of the fabricated polarizer was over 70% at 8.5-10.5 mu m wavelength, although the transmittance of the glass substrate is 62-66%, and the extinction ratio was over 20 dB at 11 mu m wavelength. The polarizer has a high TM transmittance and is cheaper and simpler to fabricate as compared with conventional infrared polarizers. (C) 2014 Elsevier B.V. All rights reserved.
  • Keiga Kawaguchi, Hiroshi Ikeda, Daisuke Sakai, Shiro Funatsu, Keiichiro Uraji, Kiyoshi Yamamoto, Toshio Suzuki, Kenji Harada, Junji Nishii
    APPLIED SURFACE SCIENCE 300 149 - 153 2014年05月 [査読有り][通常論文]
     
    Formation of a sodium depletion layer on a soda lime glass surface was accelerated efficiently using a corona discharge treatment in H-2 atmosphere. One origin of such acceleration was the preferential generation of H+ with a larger mobility at an anode needle end with a lower applied voltage than that in air. The second origin was the applied voltage across the glass plate during the corona discharge treatment, which was estimated theoretically as 2.7 times higher than that in air. These two effects doubled the depletion layer thickness compared with that in air. (C) 2014 Elsevier B.V. All rights reserved.
  • Itsunari Yamada, Junji Nishii, Mitsunori Saito
    INFRARED PHYSICS & TECHNOLOGY 63 92 - 96 2014年03月 [査読有り][通常論文]
     
    The dependences of the incident angle and thermal durability of a tungsten silicide (WSi) wire-grid polarizer were examined. A WSi grating with a 0.5 fill factor, 260 nm depth, and 400 nm period was formed on a Si surface using two-beam interference and dry etching. The TM transmission spectrum of the fabricated element was greater than 60% at the incident angle of theta=40 degrees (the angle between the incident direction and the perpendicular axis to the grating direction) in the 4-10 mu m wavelength range. An extinction ratio of 22.2 dB was achieved at 2.5 mu m wavelength. Additionally, results show that this polarizer has higher thermal resistance than that of commercial infrared polarizers. Therefore, this polarizer is effective for taking a polarized thermal image of high temperatures. (C) 2013 Elsevier B.V. All rights reserved.
  • 先端機能性材料と光技術 サブ波長構造を用いたフォトンの有効利用
    池田 弘, 酒井 大輔, 西井 準治
    CERAMICS JAPAN 49 2 129 - 131 2014年02月 [査読無し][通常論文]
  • Hiroshi Ikeda, Haruya Kasa, Hiroaki Nishiyama, Junji Nishii
    JOURNAL OF NON-CRYSTALLINE SOLIDS 383 66 - 70 2014年01月 [査読有り][通常論文]
     
    Demolding behavior of oxide glasses from molds was experimentally analyzed using a specially developed molding set up equipped with highly sensitive load cell and servomotor. The demolding point and the demolding force were apt to increase with the tensile force applied to the pressing axis, and also to the cooling rate. Especially the demolding force was strongly affected by the cooling rate when the demolding point was located near the glass transition temperature region. These results offer a useful direction for highly accurate glass-molding and glass-imprint processes. (C) 2013 Elsevier B.V. All rights reserved.
  • Mechanism of hologram formation on glass surface by recording technique with corona discharge
    D. Kobayashi, Y. Yamamoto, K. Yamamoto, S. Funatsu, K. Harada, J. Nishii
    Journal of Surface Analysis 20 3 226 - 229 2014年01月 [査読有り][通常論文]
  • Itsunari Yamada, Junji Nishii, Mitsunori Saito
    REVIEW OF SCIENTIFIC INSTRUMENTS 85 1 013102-1 - 013102-4 2014年01月 [査読有り][通常論文]
     
    A tunable transmission grating was fabricated by molding a silicone elastomer (polydimethylsiloxane). Its optical characteristics were then evaluated during compression. For fabrication, a glass plate with a photoimprinted polymer grating film was used as a mold. Both the grating period and diffraction transmittance of the molded elastomer were functions of the compressive stress. The grating period changed from 3.02 to 2.86 mu m during compressing the elastomer in the direction perpendicular to the grooves. (C) 2014 AIP Publishing LLC.
  • Junji Nishii
    2014 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2014年 [査読有り][通常論文]
     
    Glass imprint process was developed for the fabrication of micro- and nano-structures on the surface of glasses. A spherical glass lens with two dimensional subwavelength structure exhibited the surface reflectance less than 0.2% at 530 nm in wavelength. Application of DC voltage to the mold, on the other hand, was effective to suppress the imprint temperature and pressure, which was resulted from the selective decrease in alkali concentration only in the glass surface areas contacting to the mold.
  • T. Ishiyama, J. Nishii, T. Yamashita, H. Kawazoe, T. Omata
    JOURNAL OF MATERIALS CHEMISTRY A 2 11 3940 - 3947 2014年 [査読有り][通常論文]
     
    Electrochemical substitution involving electrochemical oxidation of hydrogen and proton injection into oxide glass accompanied by electrochemical reduction of alkali ions and discharge of metallic alkali out of the glass has recently been proposed as a proton injection technique. Herein, this electrochemical substitution technique was applied to phosphate glass with a composition of WO3-35NaO(1/2)-8NbO(5/2)-5LaO(3/2)-51PO(5/2) (1W-glass). Temporal evolution of the substitution of sodium ions with protons was studied using a range of techniques. The concentration depth profiles of sodium ions and protons were mirror images of each other and the amount of injected protons quantitatively agreed with that of the decrease of sodium ions. The concentration of W5+ ions formed after substitution was only 3 ppm of the amount of injected protons, so reduction of W6+ ions in glass is not essential for proton injection. Raman spectra of the glasses indicated that the glass network structure did not change during electrochemical substitution; therefore, the protons substitute sodium ions not only quantitatively but also structurally. The glass after substitution attained a high proton concentration of 4.6-6.6 x 10(21) cm(-3) and pure proton conduction with a conductivity of 4.0 x 10(-4) S cm(-1) at 250 degrees C. A test fuel cell using electrochemically substituted 1W-glass as a solid electrolyte generated a maximum power density of 0.35 mW cm(-2) operating at 250 degrees C.
  • Naoki Ikutame, Keiga Kawaguchi, Hiroshi Ikeda, Daisuke Sakai, Kenji Harada, Shiro Funatsu, Junji Nishii
    Journal of Applied Physics 114 8 083514-1 - 083514-4 2013年08月28日 [査読有り][通常論文]
     
    Periodic structures were imprinted on a soda lime glass surface below its glass transition temperature (Tg) using a carbon-coated SiO 2 mold under application of DC voltage. The structure height increased with the applied DC voltage, although no significant increase with pressure was found. At a temperature around Tg, the height reached saturation. Chemical etching using 55% KOH solution at 70 °C increased the structure height to eight times the height before etching. Noticeable alternating depression patterns and rapid chemical etching are closely related with the selective decrease in sodium concentration, which occurred only in the surface areas that were pressurized by the mold. © 2013 AIP Publishing LLC.
  • Hiroshi Ikeda, Daisuke Sakai, Shiro Funatsu, Kiyoshi Yamamoto, Toshio Suzuki, Kenji Harada, Junji Nishii
    JOURNAL OF APPLIED PHYSICS 114 6 063303-1 - 063303-6 2013年08月 [査読有り][通常論文]
     
    Formation mechanisms of alkali-free and high-proton concentration surfaces were investigated for a soda lime glass using a corona discharge treatment under an atmospheric pressure. Protons produced by high DC voltage around an anode needle electrode were incorporated into a sodium ion site in the anode side glass. The sodium ion was swept away to the cathode side as a charge carrier. Then it was discharged. The precipitated sodium was transformed to a Na2CO3 powder when the surface contacted with air. The sodium ion in the glass surface layer of the anode side was replaced completely by protons. The concentration of OH groups in the layer was balanced with the amount of excluded sodium ions. The substitution reaction of sodium ions with protons tends to be saturated according to a square root function of time. The alkali depletion layer formation rate was affected by the large difference in mobility between sodium ions and protons in the glass. (C) 2013 AIP Publishing LLC.
  • 節目を迎えたニューガラス
    西井準治
    New Glass 2013.7 28 2 1 - 2 2013年07月 [査読有り][通常論文]
  • Yamada I, Yamashita N, Einishi T, Saito M, Fukumi K, Nishii J
    Applied optics 52 1377 - 1382 7 2013年03月 [査読有り][通常論文]
  • Yamada I, Yamashita N, Einishi T, Saito M, Fukumi K, Nishii J
    Applied optics 52 7 1377 - 1382 2013年03月01日 [査読有り][通常論文]
  • 微細構造光学素子の最新動向
    西井準治
    OプラスE 35 1 42 - 43 2013年01月 [査読無し][通常論文]
  • T. Shibata, H. Ikeda, H. Nishiyama, K. Tawa, J. Nishii
    XIII INTERNATIONAL CONFERENCE ON THE PHYSICS OF NON-CRYSTALLINE SOLIDS 48 179 - 183 2013年 [査読有り][通常論文]
     
    Silver coated gratings were fabricated using an ultraviolet nanoimprint process followed by an electron beam evaporation method. A SiO2 mold was used for the nanoimprint. The long and short range surface plasmon modes could be observed by adjusting the refractive indices of top and bottom surface layers of silver grating. The surface roughness (Ra) of silver affected the surface plasmon resonance characteristics. The deep and narrow plasmon coupling dip could be observed for the silver film with Ra less than 2 nm. (C) 2013 The Authors. Published by Elsevier B.V. Open access under CC BY-NC-ND license.
  • H. Ikeda, H. Kasa, H. Mayama, H. Nishiyama, J. Nishii
    XIII INTERNATIONAL CONFERENCE ON THE PHYSICS OF NON-CRYSTALLINE SOLIDS 48 109 - 112 2013年 [査読有り][通常論文]
     
    Measurement method of compressive or tensile forces during glass imptrint was developed by improving a lens mold press machine. Deformation and demolding behaviors could be quantified under the pressing using a glassy carbon and a tungsten carbide mold. After the pressing of a glass at slightly above the deformation temperature followed by the cooling of the glass and mold under applying a small tensile force, an abrupt demolding was observed below the glass transition temperature, which was affected by the pressing temperature and the glass compositions. This measurement method should be useful for the characterization of deformation and demolding behaviors of wide variety of glasses not only for optical lens but also for nanostructured optical components. (C) 2013 The Authors. Published by Elsevier B.V. Open access under CC BY-NC-ND license.
  • T. Shoji, H. Ikeda, H. Mayama, H. Nishiyama, J. Nishii
    Physics Procedia 48 81 - 84 2013年 [査読有り][通常論文]
     
    Phosphate glass with composition of 35NaO1/2 20WO3 45PO5/2 prepared by a conventional melt-quenching method was treated by a positive corona discharging at room temperature. It was found that the OH concentration in the top surface layer of the glass increased by the treatment of +6.0-7.5 kV, for 10 h in 5%H2-95%N2 atmosphere and 5.0 mm in positive electrode and glass surface distance. On the other hand, the Na ion in the same area of 15 μm thickness diffused and precipitated to the bottom surface. It was found by the infrared and Raman spectra that the Na was replaced by implanted proton without notable structural change. © 2013 The Authors.
  • T. Ishiyama, S. Suzuki, J. Nishii, T. Yamashita, H. Kawazoe, T. Omata
    JOURNAL OF THE ELECTROCHEMICAL SOCIETY 160 11 E143 - E147 2013年 [査読有り][通常論文]
     
    A novel technique was developed to inject proton carriers into phosphate glass. Sodium ions in the sodium tungsten phosphate glass were electrochemically substituted with protons. A glass plate with a deposited Pd anode was placed on the molten tin cathode and heated at a temperature below glass transition temperature under DC-bias in hydrogen containing atmosphere. Protons were injected from the palladium anode and substituted the sodium ions in the glass. The sodium ions migrated to the cathode and discharged to the molten tin cathode by capturing an electron from the external circuit. The atomic sodium dissolved into the cathode and reacted with CO2 impurities in the atmosphere resulting deposition of sodium carbonate on the tin cathode surface. After almost all of the sodium ions were discharged from the glass, the proton concentration in the glass reached 4.3 x 10(21) cm(-3). The proton conductivity was found to be 1 x 10(-3) Scm(-1) at 350 degrees C. The injected protons were stable at temperatures below 400 degrees C. The glass obtained by this technique behaves as a mixed conductor of protons and electrons with a proton transport number of 0.30. A possible means to suppress the electronic conductivity was discussed. (C) 2013 The Electrochemical Society. All rights reserved.
  • Keiko Tawa, Tsuyoshi Fujita, Chie Hosokawa, Junji Nishii
    Optics InfoBase Conference Papers 2013年
  • Yamada Itsunari, Yamashita Naoto, Einishi Toshihiko, Saito Mitsunori, Fukumi Kouhei, Nishii Junji
    INTEGRATED PHOTONICS: MATERIALS, DEVICES, AND APPLICATIONS II 8767 2013年 [査読有り][通常論文]
  • Kohei Fukumi, Naoyuki Kitamura, Junji Nishii
    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 120 1408 599 - 602 2012年12月 [査読有り][通常論文]
     
    Browning after heating under vacuum has been studied on bismuth borate glasses. It was found that the reaction of water with glass surfaces was a necessary step for browning and that browning occurred at the surface of glass. The fraction of Bi atoms forming Bi metal was about 1%. It was deduced that browning was caused by the formation of Bi metal particles through the dehydration of hydrated layer of the glass surface. (C)2012 The Ceramic Society of Japan. All rights reserved.
  • ガラスインプリント
    西井準治
    ナノインプリント/ナノ加工技術とオプトテクノロジー 157 - 166 2012年08月 [査読無し][通常論文]
  • Itsunari Yamada, Naoto Yamashita, Kunihiko Tani, Toshihiko Einishi, Mitsunori Saito, Kouhei Fukumi, Junji Nishii
    APPLIED PHYSICS EXPRESS 5 7 072601-1 - 072601-2 2012年07月 [査読有り][通常論文]
     
    An achromatic infrared wave plate was fabricated by forming a subwavelength grating on the chalcogenide glass using direct imprint lithography. A low toxic chalcogenide glass (Sb-Ge-Sn-S system) substrate was imprinted with a grating of 1.63-mu m depth, a fill factor of 0.7, and 3-mu m period using glassy carbon as a mold at 253 degrees C and 3.8 MPa. Phase retardation of the element reached around 30 degrees at 8.5-10.5 mu m wavelengths, and the transmittance exceeded that of a flat substrate over 8 mu m wavelength. Fabrication of the mid-infrared wave plate is thereby less expensive than that of conventional crystalline wave plates. (C) 2012 The Japan Society of Applied Physics
  • Keiko Tawa, Susumu Haruta, Tetsuo Okutsu, Junji Nishii
    JAPANESE JOURNAL OF APPLIED PHYSICS 51 6 06FK09-1 - 06FK09-4 2012年06月 [査読有り][通常論文]
     
    The photochemically induced crystallization of lysozyme was studied on a two-dimensional surface relief grating coated with a thin gold film (2D-plasmonic chip), a flat thin gold film, and a flat UV-curable resin. The lysozyme solution prepared in a metastable compositional region was dropped on each surface. After an exposure to visible light from a filtered Hg lamp (500 and 800nm in wavelength, 1.5W/cm(2)) for 30 min followed by 18 h keeping in the dark, the crystal particles were observed in the droplets. Under a microscope, the numbers of crystalline particles were counted to be 1280, 258, and 180 on the 2D-plasmonic chip, the flat gold film, and the flat UV-curable resin, respectively. It was suggested that the crystallization tendency of lysozyme was effectively accelerated by the enhanced electric field caused by the coupling of incident light with surface plasmon polaritons on the 2D-plasmonic chip. (C) 2012 The Japan Society of Applied Physics
  • Chikara Yasui, Keiko Tawa, Chie Hosokawa, Junji Nishii, Hiroyuki Aota, Akira Matsumoto
    JAPANESE JOURNAL OF APPLIED PHYSICS 51 6 06FK10-1 - 06FK10-5 2012年06月 [査読有り][通常論文]
     
    A plasmonic chip with a periodic structure coated with thin metal films was fabricated and applied to bioimaging under a fluorescence microscope. By using the enhanced electric field of surface plasmon resonance excited on the chip, an enhanced fluorescence of samples was observed by conventional fluorescence microscopy. In this study, neurons were cultured on a plasmonic chip, which was used instead of a glass-bottomed dish or cover glass; the received fluorescence images of neuron dendrites were more than four times brighter than those obtained from similar specimens cultured on a glass-bottomed dish and observed using an upright fluorescence microscope. (C) 2012 The Japan Society of Applied Physics
  • Yuki Hattori, Takashi Wakasugi, Haruhisa Shiomi, Junji Nishii, Kohei Kadono
    JOURNAL OF MATERIALS RESEARCH 27 7 999 - 1005 2012年04月 [査読有り][通常論文]
     
    Li+ for Na+ ion-exchange-induced phase separation in borosilicate glass was investigated. A glass with a composition, 70SiO(2)center dot 15B(2)O(3)center dot 15Na(2)O, was prepared. The glass was transparent, and macroscopically no phase separation was observed because the immiscibility temperature for the composition was lower than the glass transition temperature. Substitution of Li+ for Na+ at the surface domain of the glass induced phase separation in the domain and subsequent heat treatment evolved interconnected silica-rich and alkali borate-rich phases through the phase separation. However, the parts in which ion exchange did not occur kept homogeneous and transparent. This phenomenon is explainable by the fact that the immiscibility temperature for the Li+-substituted composition of the original glass elevated up to a temperature higher than the ion exchange and heat treatment temperatures. The borate-rich phases leached by acid treatment for the phase-separated glass. Through these processes, we obtained monolithic glasses consisting of porous domains, and homogeneous and transparent parts.
  • Masaya Mitsuishi, Shimpei Morita, Keiko Tawa, Junji Nishii, Tokuji Miyashita
    LANGMUIR 28 5 2313 - 2317 2012年02月 [査読有り][通常論文]
     
    We present spontaneous emission control of a core-shell CdSe/ZnS nanoparticle array assembled with polymer ultrathin films consisting of polymer nanosheets on a silver grating substrate, which served as a unique and simple photonic cavity. The grating-coupled waveguide modes enabled 10(3) order luminescence enhancement and one-fourth spectral narrowing. The light emission from a CdSe/ZnS nanopartide array can be controlled by tuning the film thickness of hybrid polymer nanoassemblies, which provides multiple emission performance with good tuning ability from red to green at low-power continuous wave laser excitation (similar to mu W).
  • Kenji Kintaka, Tatsuya Majima, Junichi Inoue, Koji Hatanaka, Junji Nishii, Shogo Ura
    OPTICS EXPRESS 20 2 1444 - 1449 2012年01月 [査読有り][通常論文]
     
    A guided-mode resonance filter integrated in a waveguide cavity resonator constructed by two distributed Bragg reflectors is designed and fabricated for miniaturization of aperture size. Reflection efficiency of >90% and wavelength selectivity of 0.4 nm are predicted in the designed SiO2-based filter with 50-mu m aperture by a numerical calculation using the finite-difference time-domain method. A maximum reflectance of 67% with 0.5-nm bandwidth is experimentally demonstrated by the fabricated device at around 850-nm wavelength. (C)2012 Optical Society of America
  • Itsunari Yamada, Kouhei Fukumi, Junji Nishii, Mitsunori Saito
    MICRO-OPTICS 2012 8428 2012年 [査読有り][通常論文]
     
    We fabricated a subwavelength-grating structure on the Y2O3 ceramic substrate, which has higher transparency than silicon in the mid-infrared range. After coating a photoresist on this substrate, we formed a grating pattern of 350-nm pitch by the two-beam interference of the He-Cd laser (325-nm wavelength). By using this photoresist grating as a mask, WSi was etched with reactive SF6 ions. The transmittance of the transverse magnetic (TM) polarization was greater than 70% in the 3-7-mu m wavelength range without antireflection films and the extinction ratio was over 20 dB in the 2.5-5-mu m wavelength range. In addition, we also fabricated near-infrared wire-grid polarizer consisting of a 230-nm pitch WSi grating on a SiO2 substrate. The TM polarization transmittance of the fabricated polarizer exceeded 80% in the 1000-1600-nm wavelength range. The extinction ratio was higher than 20 dB in the 650-1500-nm wavelength range.
  • Yamada Itsunari, Yamashita Naoto, Tani Kunihiko, Einishi Toshihiko, Saito Mitsunori, Fukumi Kouhei, Nishii Junji
    JAPANESE JOURNAL OF APPLIED PHYSICS 51 1 12201 - 012201-4 The Japan Society of Applied Physics 2012年01月 [査読有り][通常論文]
     
    We fabricated infrared wire-grid polarizers consisting of a 500-nm pitch Al grating on a low toxic chalcogenide glass (Sb--Ge--Sn--S system) using the direct imprinting of subwavelength grating followed by a deposition of Al metal by thermal evaporation. To fabricate the subwavelength grating on a chalcogenide glass more easily, the sharp grating was formed on the mold surface. The fabricated polarizer with Al thickness of 130 nm exhibited a polarization function with a transverse magnetic transmittance greater than 60% in the 5--9 μm wavelength range, and an extinction ratio greater than 20 dB in 3.5--11 μm wavelength range. The extinction ratio of the element with Al wires of 180-nm thickness reached 27 dB at 5.4-μm wavelength. The polarizer can be fabricated at lower costs and simpler fabrication processes compared to conventional infrared polarizers.
  • I. Yamada, N. Yamashita, K. Tani, T. Einishi, M. Saito, K. Fukumi, J. Nishii
    Appl. Phys. Express 5 8 082502/1 - 3 The Japan Society of Applied Physics 2012年 [査読有り][通常論文]
     
    We fabricated infrared wire-grid polarizers with an antireflection (AR) grating structure by the simultaneous imprinting on both sides of a low-toxicity chalcogenide glass (Sb--Ge--Sn--S system). Silicon carbide and glassy carbon plates were used as molds for the direct glass imprinting. A wire-grid polarizer of 100-nm-thick was produced by depositing Al obliquely on the grating. Although the transmittance of the chalcogenide glass substrate was 62--66% in the 8.5--10.5 μm wavelength range, the transverse magnetic (TM) transmittance of the fabricated element became higher than 70% owing to the AR structure. The extinction ratio was larger than 20 dB at 11 μm wavelength.
  • Keiko Tawa, Yoshiki Yokota, Kenji Kintaka, Junji Nishii, Takahiko Nakaoki
    SENSORS AND ACTUATORS B-CHEMICAL 157 2 703 - 709 2011年10月 [査読無し][通常論文]
     
    Plasmonic chips coated with thin silver and SiO2 layers were applied to a simple biosensor with wide dynamic range, which has some advantages in the points of sensitivity and surface selectivity in spite of a simple fluorescence detection system without complex optical stuffs. The enhanced fluorescence of fluorescent labeled-marker proteins, cy5-streptavidin (SA), excited by irradiation light from the rear panel of the chip was measured. To obtain the maximum fluorescence enhancement by excitation under an electric field enhanced by grating-coupled surface plasmon resonance from the rear irradiation, the optimal silver thickness was studied and found to be 30-35 nm. A directional fluorescence due to re-coupling between fluorescence and plasmon polaritons was also observed on the plasmonic chips and enhanced fluorescence 90 times compared with that on glass slides was superior to the others reported. The limit of detection (LOD) studied here was improved up to 50 pM after 10-min incubation and dynamic range was also extended by 2 order, compared with that on glass slides. The irradiation from the rear panel demonstrated advantage in the surface-selective detection of cy5-SA at 100 nM concentration. Our plasmonic chip has great potential in biosensing application due to its advantages of rapid detection, simple operation, high sensitivity (wide dynamic range), surface selectivity, and suppression of nonspecific adsorption. (C) 2011 Elsevier B.V. All rights reserved.
  • Itsunari Yamada, Naoto Yamashita, Kunihiko Tani, Toshihiko Einishi, Mitsunori Saito, Kouhei Fukumi, Junji Nishii
    OPTICS LETTERS 36 19 3882 - 3884 2011年10月 [査読有り][通常論文]
     
    A mid-IR wire-grid polarizer with a 500nm pitch was fabricated on a low toxic chalcogenide glass (Sb-Ge-Sn-S system) by the thermal imprinting of periodic grating followed by the thermal evaporation of Al metal. After imprinting, deposition of Al on the grating at an oblique angle produced a wire-grid polarizer. The fabricated polarizer showed polarization with TM transmittance greater than 60% at 5-9 mu m wavelengths and an extinction ratio greater than 20 dB at 3.5-11 mu m wavelengths. This polarizer with a high extinction ratio can be fabricated more simply and less expensively than conventional IR polarizers. (C) 2011 Optical Society of America
  • ガラスインプリント法の最新動向
    西井準治
    光技術コンタクト 49 6 30 - 37 2011年06月 [査読無し][通常論文]
  • Hiroaki Nishiyama, Yu-ichi Sagawa, Norihiro Furukawa, Shintaro Okamoto, Yoshinori Hirata, Junji Nishii
    JAPANESE JOURNAL OF APPLIED PHYSICS 50 6 06GL02-1 - 072011-3 2011年06月 [査読有り][通常論文]
     
    Microfluidic devices with off-axis diffractive focusing reflectors (DFRs) were fabricated for refractive index sensing in biological and chemical fields. Such devices can detect refractive index changes of dielectric liquid samples just above the DFRs by measuring the changes of diffracted power from the fluidic devices. The focusing reflectors consist of curved SiO2 lines with periods which gradually varied from 1.23 to 3.73 mu m. When a probe laser with 632.8 nm wavelength was coupled to the DFRs at the off-axis angle of 20 degrees, a focal spot of 3.5 mu m was observed at the distance of 1000 mu m from the lens surface, which was close to theoretical value. (c) 2011 The Japan Society of Applied Physics
  • Keiko Tawa, Xiaoqiang Cui, Kenji Kintaka, Junji Nishii, Kenichi Morigaki
    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 221 2-3 261 - 267 2011年06月 [査読有り][通常論文]
     
    Grating-coupled surface plasmon-field enhanced fluorescence (GC-SPF) was applied to biosensing. Although the greatest enhancement of GC-SPF on our plasmonic chips compared with that on a glass slide was found to be 40 times, this was due to the enhanced excitation field. Therefore, grating-coupled fluorescence using a reverse coupling mode is here explored to achieve further 4-5 times enhancement. As a result of using both the excitation field enhanced by grating-coupled surface plasmon resonance and the directional emission enhanced by reverse coupling mode, an increase in fluorescence of more than 110 times compared with that on the glass slide was recorded. The reverse coupling mode was also applied to the sensitive fluorescence microscopic imaging of Cy5-streptavidin (Cy5-SA) in microfluidic channels on a two dimensional nanohole array substrate. We performed a Cy5-SA concentration series analysis in which the plasmonic substrate demonstrated 26.3x enhancement of sensitivity and a limit of detection (LOD) of ca. 100 pM, which is at least one order of magnitude lower than in glass slides with identical surface chemistry. This plasmonic nanostructure will be invaluable for colorimetric detection in applications such as microfluidic enzyme-linked immune-sorbent assay (ELISA) device, and portable microarray biosensing, because the optical setup can be simplified. (C) 2011 Elsevier B.V. All rights reserved.
  • Mizue Mizoshiri, Yoshinori Hirata, Junji Nishii, Hiroaki Nishiyama
    OPTICS EXPRESS 19 8 7673 - 7679 2011年04月 [査読有り][通常論文]
     
    We found that marked increases in refractive index of chemically amplified photoresists induced by highly repetitive femtosecond laser irradiation without post-exposure baking treatment. For laser writing speed less than 30 mu m/s, the refractive index change of the nonlinear absorption region was as large as 8 x 10(-3). Moreover, cross-linking reactions of the resists were induced. The refractive index changes can generate optical confinement and subsequent channel propagations of femtosecond laser pulses. The coupling efficiency was estimated as high as 87% using a low numerical aperture objective lens. The peak intensities of the guiding modes exceeded the polymerization threshold of the resist. (C) 2011 Optical Society of America
  • Naoyuki Kitamura, Kohei Fukumi, Junichi Nakamura, Tatsuo Hidaka, Takurou Ikeda, Hidekazu Hashima, Junji Nishii
    JOURNAL OF NON-CRYSTALLINE SOLIDS 357 3 1188 - 1192 2011年02月 [査読有り][通常論文]
     
    The effects of the substitution of fluoride ions for oxide ions on the thermal and optical properties of ternary ZnO-Bi(2)O(3)-P(2)O(5) glass with low-P(2)O(5) content (20-25 mol%) were investigated. Fluoride ions were introduced into the glass up to about 12 mol% as ZnF(2). Raman spectra indicated that fluoride ions were substituted for oxide ions connected with bismuth ions. Deformation and glass transition temperatures decreased monotonically with fluorine concentration. The absorption edge shifted toward higher energies with increasing fluorine concentration by about 0.3 eV for 12 mol% ZnF2 substitution. The blue shift of the absorption edge is attributable to two effects. One was a blue shift of an absorption band which was observed as a peak at 4.7 eV in the reflection spectra and was attributed to the spin forbidden 6s-6p interband transition in Bi(3+) ions. The blue shift originates from a change in electron-donating ability through anions as expected from electronegativity or optical basicity. Another is a disappearance of a shoulder at around 4.3 eV in the reflection spectra. The latter was the major reason for the large blue shift of the absorption edge energy. because the band relating to the 4.3 eV shoulder is close to the absorption edge. (C) 2010 Elsevier B.V. All rights reserved.
  • H. Nishiyama, M. Mizoshiri, Y. Hirata, J. Nishii
    IOP Conference Series: Materials Science and Engineering 18 4 072011-1 - 072011-1 2011年 [査読有り][通常論文]
     
    We fabricated three-dimensional SiO2 surfaces using femtoseond laser nonlinear optical lithography. By pattern transfers of polymerized resist patterns, which were written via nonlinear absorption, into underlying substrates, SiO2 hybrid microlens structures were created. Fresnel zone plate patterns were written on curved surfaces of microlenses whose diameters and curvature radii were 240 μm and 380 μm, respectively. The surface observation revealed that the surface roughness of the transferred SiO2 was improved with O2 concentration during plasma etching. When He-Ne laser light of 632.8 nm wavelength was coupled to the hybrid lenses, the focal lengths became shorter than those of the original refractive lenses. This shift amount of 216 μm was consistent with theoretical value of 213 μm, indicating nonlinear lithography was useful for the precise microfabrication of photonic devices with three-dimensional surfaces. © 2011 Ceramic Society of Japan.
  • Junji Nishii
    SMART NANO-MICRO MATERIALS AND DEVICES 8204 820405-1 - 820405-8 2011年 [査読無し][通常論文]
     
    Imprint process to form fine structures onto a glass surface was studied with the aim of developing several functions such as antireflection, dispersion correction and polarization control. The fabrication of SiC molds with high thermal durability and mechanical strength enabled us to imprint an antireflection structure with reflectivity of 1/20 that of the polished surface in the visible wavelength region. Furthermore, such technology was successfully applied to the fabrication of antireflection lens.
  • Naoyuki Kitamura, Kohei Fukumi, Junji Nishii
    OPTICAL COMPONENTS AND MATERIALS VIII 7934 M1 - M8 2011年 [査読無し][通常論文]
     
    An antireflective two-dimensional subwavelength structure and a one-dimensional periodic structure with large phase retardation were fabricated on the glass surfaces by glass-imprint process. Novel low-Tg optical glasses based on bismuth phosphate and bismuth borate systems have been developed for the fabrication of these structures. These glasses had refractive indexes higher than 1.8 and deformation temperatures lower than 500 degrees C. Antireflective structure optimized by rigorous coupled-wave analysis was fabricated on an SiC mold having a curved surface for lens formation by using electron-beam lithography and dry etching techniques. Reflectivity at the imprinted surface relief decreased to about one-tens as compared with that at the polished surface in the visible region, and had less dependence on incident angle and wavelength. Mold shape has been optimized to fabricate one-dimensional structure with a high aspect ratio. A phase retardation of 0.23 lambda was observed between TE- and TM-polarized beams at 400 nm in the glass plate on both the surfaces of which one-dimensional structures were fabricated.
  • Itsunari Yamada, Kohei Fukumi, Junji Nishii, Mitsunori Saito
    JAPANESE JOURNAL OF APPLIED PHYSICS 50 1 012502-1 - 012502-3 2011年01月 [査読有り][通常論文]
     
    We fabricated a near-infrared wire-grid polarizer consisting of a 230-nm-pitch tungsten silicide (WSi) grating on a SiO2 substrate using two-beam interference lithography and dry etching. The transverse magnetic (TM) polarization transmittance of the fabricated polarizer exceeded 80% in the 1000-1600-nm wavelength range. The extinction ratio was higher than 20 dB in the 650-1500-nm wavelength range. We also measured the extinction coefficient kappa of WSi and verified that WSi is a suitable polarizing material in the near-infrared range. (c) 2011 The Japan Society of Applied Physics
  • Kenji Kintaka, Tatsuya Majima, Junichi Inoue, Koji Hatanaka, Shogo Ura, Junji Nishii
    Optics InfoBase Conference Papers 2011年 
    A guided-mode resonance filter integrated in a SiO2-based waveguide cavity resonator was designed and fabricated for miniaturization of aperture size. A high-reflection narrowband filter at around 850-nm wavelength was experimentally demonstrated for the first time. © OSA/ANIC/IPR/Sensors/SL/SOF/SPPCom/2011.
  • Ura Shogo, Kintaka Kenji, Awazu Hideyuki, Awatsuji Yasuhiro, Nishii Junji
    OPTICAL REVIEW 18 1 99 - 102 2011年01月 [査読有り][通常論文]
     
    An interference exposure system using a phase-shifting mask was proposed for generating periodic sawtooth optical intensity profile with chirp in period. Multiple space-harmonic waves are launched from the mask by diffraction, and the sawtooth optical intensity is formed by interference based on Fourier synthesis after propagation through an air gap. The design concept merely utilizing positive diffraction-order harmonics with tilt illumination of an exposure light and a design algorithm based on time-reversed configuration for calculating required phase shift amount were proposed and discussed. A phase-shifting mask for a blazed grating of very high chirp rate was designed to demonstrate its potential and feasibility. The grating period changes from 2.2 to 3.1 mu m gradually within 0.3mm length. Sawtooth-like optical intensity profile was confirmed by theoretical simulation as well as preliminary experimental results. (C) 2011 The Japan Society of Applied Physics
  • Naoyuki Kitamura, Kohei Fukumi, Junichi Nakamura, Tatsuo Hidaka, Takurou Ikeda, Hidekazu Hashima, Junji Nishii
    JOURNAL OF NONLINEAR OPTICAL PHYSICS & MATERIALS 19 4 753 - 759 2010年12月 [査読有り][通常論文]
     
    We have developed zinc-bismuth-phosphate glasses, which have deformation temperatures under 450 degrees C and refractive indices higher than 1.7, in order to produce an antireflection structure on the surface by a glass-imprinting process. Two-dimensionally arrayed conical cavities of sub-wavelength size were fabricated on a SiC mold by electron lithography and dry etching techniques. The sub-wavelength periodic structure was transferred onto the glass surface by a glass-imprinting process using the mold. The sub-wavelength structure suppressed the reflectance by approximately 90%. A weak maximum was observed in the reflection spectra around 400-500 nm, which decreased in intensity and shifted toward shorter wavelengths with decreasing pitch.
  • Kenji Kintaka, Katsuya Shimizu, Yuki Kita, Satoshi Kawanami, Junichi Inoue, Shogo Ura, Junji Nishii
    OPTICS EXPRESS 18 24 25108 - 25115 2010年11月 [査読有り][通常論文]
     
    A prototype free-space-wave drop demultiplexer consisting of a cavity-resonator-integrated grating input/output coupler (CRIGIC) and a different-guided-mode-coupling distributed Bragg reflector (DGM-DBR) was designed for constructing a high-density wavelength-division-multiplexing intra-board chip-to-chip optical interconnection. The CRIGIC consists of one grating coupler and two DBRs, and can vertically couple a guided wave and a free-space wave with high efficiency. A two-channel drop demultiplexer operating at around 850-nm wavelength with 5-nm channel spacing in wavelength was fabricated in a thin-film SiO2-based waveguide. The device performance was predicted theoretically, characterized experimentally, and discussed. (C) 2010 Optical Society of America
  • SiO2 off-axis diffractive focusing reflectors inside microchannels fabricated using nonlinear lithography
    西山 宏昭, 佐川 雄一, 古川 範大, 平田 好則, 西井 準治
    第27回センサマイクロマシンと応用シンポジウム論文集 1 1 247 - 250 2010年10月 [査読無し][通常論文]
  • Itsunari Yamada, Kouhei Fukumi, Junji Nishii, Mitsunori Saito
    OPTICS LETTERS 35 18 3111 - 3113 2010年09月 [査読有り][通常論文]
     
    Using two-beam interference lithography and dry etching, we fabricated a mid-IR wire-grid polarizer consisting of a 350 nm pitch WSi grating on an Y2O3 ceramic substrate, which has wider transparency than sapphire. The transmittance of TM polarization was greater than 70% in the 3-7 mu m wavelength range without antireflection films, and the extinction ratio was over 20 dB in the 2.5-5 mu m wavelength range. The wire-grid polarizer with the Y2O3 ceramic substrate provides high durability and good IR transparency. (C) 2010 Optical Society of America
  • Naoyuki Kitamura, Kentarou Ohno, Kohei Fukumi, Junichi Nakamura, Tatsuo Hidaka, Takurou Ikeda, Hidekazu Hashima, Hiromitsu Kozuka, Junji Nishii
    JAPANESE JOURNAL OF APPLIED PHYSICS 49 8 082601-1 - 082601-4 2010年08月 [査読無し][通常論文]
     
    The effect of third-additive oxides on absorption edge energy was studied in binary bismuth phosphate glass The edge energy was shifted toward lower energies by the substitution of third-additive oxides for P(2)O(5) The substitutions of glass-network-forming (NWF) oxides and glass-network-modifying (NWM) oxides resulted in distinct linear relationships between the edge energy and Duffy's ideal basicity The energy shift against the calculated basicity was larger for the substitution of NWF oxides than for that of NWM oxides Moreover, the substitution of intermediate oxides gave a similar tendency to the substitution of NWF oxides rather than to that of NWM oxides for both relationships It was deduced that electron donation is more sensitive to the substitution of NWF oxides than to that of NWM oxides On the other hand, a 238 cm(-1) Raman band, which is attributed to the Bi-O vibration mode, shifted toward higher wave numbers by the substitution of all of the oxides The 238 cm(-1) band showed a linear relationship with the ideal basicity similar to the relationship between the edge energy and the basicity Sensitivity against electron donation was consistent with both the Bi-O bond strength and the absorption edge energy (C) 2010 The Japan Society of Applied Physics
  • Kohei Kadono, Yuki Hattori, Takashi Wakasugi, Haruhisa Shiomi, Junji Nishii
    CHEMISTRY LETTERS 39 8 824 - 825 2010年08月 [査読無し][通常論文]
     
    Utilizing the difference in the size of the immiscibility regions with alkali ions, phase separation was induced at the surface of 70SiO(2)center dot 15B(2)O(3)center dot 15Na(2)O (mol %) glass by ion exchange in which Na+ ions were replaced by Li+ ions in molten LiNO3 salt at 400 degrees C. The heat treatment after the ion exchange made the phase separation proceed and formed phases which can be dissolved by acid treatment. Through the ion-exchange-induced phase separation, we prepared monolithic glasses, in which only the surface region is porous and the rest is homogeneous and transparent.
  • Kenji Kintaka, Yuki Kita, Katsuya Shimizu, Hitoshi Matsuoka, Shogo Ura, Junji Nishii
    OPTICS LETTERS 35 12 1989 - 1991 2010年06月 [査読無し][通常論文]
     
    A cavity-resonator-integrated grating input/output coupler (CRIGIC) is designed to operate at about 850 nm wavelength for high-efficiency vertical coupling of a guided wave and a free-space wave with a small aperture. The CRIGIC consists of a grating coupler and a waveguide cavity resonator constructed by two distributed Bragg reflectors. A coupling efficiency of 96% with a 3 dB bandwidth of 1: 2 nm is predicted by a theoretical calculation. An output coupling efficiency of about 60% is experimentally demonstrated on a 20 mu m aperture device, fabricated in a thin-film SiO(2)-based waveguide on a substrate with an Au reflection layer, for what we believe to be the first time. (C) 2010 Optical Society of America
  • Hironobu Hori, Keiko Tawa, Kenji Kintaka, Junji Nishii, Yoshiro Tatsu
    JOURNAL OF APPLIED PHYSICS 107 11 114702-1 - 114702-6 2010年06月 [査読無し][通常論文]
     
    The fluorescence excited by the enhanced electric field of grating-coupled surface plasmon resonance was detected on biochips. The enhancement of the electric field on a metallic grating surface was calculated using the finite difference time domain method for rectangular, trapezoidal, and sinusoidal models to clarify the grating-surface profile dependence of the enhanced fluorescence. The computational results showed that the enhancement in the trapezoidal model was stronger than that in the other models, and that the groove depth dependence of the enhancement in the trapezoidal model agreed well with the experimental data. The grating surface profile, including the groove depth, was found to be an important parameter of the grating structure for it to couple effectively with light. (C) 2010 American Institute of Physics. [doi:10.1063/1.3408446]
  • インプリント法による高機能ガラス光学素子の作製
    西井準治
    ニューガラス 25 2 7 - 10 2010年06月 [査読無し][通常論文]
  • Kenji Kintaka, Yuki Kita, Katsuya Shimizu, Hitoshi Matsuoka, Shogo Ura, Junji Nishii
    OPTICS LETTERS 35 12 1989 - 1991 2010年06月 [査読有り][通常論文]
     
    A cavity-resonator-integrated grating input/output coupler (CRIGIC) is designed to operate at about 850 nm wavelength for high-efficiency vertical coupling of a guided wave and a free-space wave with a small aperture. The CRIGIC consists of a grating coupler and a waveguide cavity resonator constructed by two distributed Bragg reflectors. A coupling efficiency of 96% with a 3 dB bandwidth of 1: 2 nm is predicted by a theoretical calculation. An output coupling efficiency of about 60% is experimentally demonstrated on a 20 mu m aperture device, fabricated in a thin-film SiO(2)-based waveguide on a substrate with an Au reflection layer, for what we believe to be the first time. (C) 2010 Optical Society of America
  • M. Saito, T. Yamamoto, I. Yamada, J. Nishii, S. Mihara, M. Urano
    Japanese Journal of Applied Physics 49 5 052503-1 - 052503-5 2010年05月 [査読有り][通常論文]
     
    An IR polarizer was fabricated by plating a Ni wire-grid on a Si substrate. The Si surface was processed by photolithography to create grooves with similar to 200 nm width, similar to 200 nm spacing, and similar to 300 nm depth. After surface treatment, the Si plate was put in a plating bath for similar to 5 min to fill the grooves with Ni. The excess Ni film that was deposited outside the grooves was removed by mechanical polishing. The fabricated wire-grid exhibited a polarization function with an extinction ratio of 15-20 dB in the 3-13 mu m wavelength range. (C) 2010 The Japan Society of Applied Physics
  • Kenji Kintaka, Junji Nishii, Shunsuke Murata, Shogo Ura
    JOURNAL OF LIGHTWAVE TECHNOLOGY 28 9 1398 - 1403 2010年05月 [査読無し][通常論文]
     
    A wavelength-division-multiplexing (WDM) optical interconnect device has been proposed and investigated in order to realize broadband signal transmission in intraboard chip-to-chip interconnection. Focusing grating couplers (FGCs) and distributed Bragg reflectors were integrated in a thin-film waveguide to form free-space-wave add/drop multi-/demultiplexers for the WDM optical interconnections. This time, FGC coupling efficiency was improved by careful fabrication with multistep deposition and measurements of reflection spectra. An eight-channel WDM interconnect device was fabricated and characterized in the wavelength dependence.
  • ガラスインプリント法によるサブ波長光学素子の形成
    西井準治
    電気硝子 43 10 - 15 2010年04月 [査読無し][通常論文]
  • サブ波長周期構造素子の開発−現状と今後の展望
    西井準治
    工業材料 58 3 29 - 32 2010年03月 [査読無し][通常論文]
  • Xiaoqiang Cui, Keiko Tawa, Kenji Kintaka, Junji Nishii
    ADVANCED FUNCTIONAL MATERIALS 20 6 945 - 950 2010年03月 [査読無し][通常論文]
     
    A two-dimensional (2D) plasmonic coupling nanostructure for enhanced fluorescence observation using a microscope is presented. The substrate contained periodically assembled nanohole arrays with a pitch of 400 nm and a depth of 25 nm. In comparison with one-dimensional (1D) gratings, this new substrate presented an excellent surface plasmon coupling ability to illuminate light from all directions. Under an optical microscope, an enhancement in the fluorescence intensity of up to 100 times compared with a plain glass slide was observed. The ability to markedly increase the fluorescence intensity means this technique has great potential for application in biodiagnostics, imaging, sensing, and photovoltaic cells.
  • Xiaoqiang Cui, Keiko Tawa, Hironobu Hori, Junji Nishii
    ADVANCED FUNCTIONAL MATERIALS 20 4 546 - 553 2010年02月 [査読無し][通常論文]
     
    The ability to precisely control the pattern of metallic structures at the micro- and nanoscale for surface plasmon coupling has been demonstrate to be essential for signal enhancement in fields such as fluorescence and surface- enhanced Raman scattering. In the present study, a series of silver coated gratings with tailored duty ratio and depth and a periodical pitch of 400 nm are designed and implemented. The influence of the grating profile on plasmonic properties and the corresponding enhancement factor are investigated by angular scanning measurement of reflectivity and fluorescence intensity and by finite difference time domain simulation. The application of the substrate in the enhanced fluorescence imaging detection of labeled protein is also investigated. This substrate has a wide rang of potential applications in areas including biodiagnostics, imaging, sensing, and photovoltaic cells.
  • Takamasa Tamura, Makoto Umetani, Kazuhiro Yamada, Yasuhiro Tanaka, Kenji Kintaka, Haruya Kasa, Junji Nishii
    APPLIED PHYSICS EXPRESS 3 11 112501-1 - 112501-3 2010年 [査読有り][通常論文]
     
    For the first time, an antireflective structure (ARS) on a convex spherical glass surface was fabricated using an imprinting process. The inverted pattern of the ARS with a 250-nm period was fabricated on a SiC mold with a concave surface using electron beam (EB) direct writing and reactive ion etching. The sample surface height was adjusted to the EB focal position along the mold curvature during the step-and-repeat EB lithography. The imprinted lens with the ARS exhibited surface reflectance of 0.2% at a wavelength of 530 nm and a spherical error magnitude of less than 500 nm. (C) 2010 The Japan Society of Applied Physics
  • M. Mizoshiri, H. Nishiyama, J. Nishii, Y. Hirata
    FRONTIERS IN ULTRAFAST OPTICS: BIOMEDICAL, SCIENTIFIC, AND INDUSTRIAL APPLICATIONS X 7589 75891E-1 - 75891E-8 2010年 [査読無し][通常論文]
     
    Refractive indices of a chemically amplified photoresist were changed by femtosecond (fs) laser irradiation without post exposure bake (PEB) treatment. We have proposed a combined process of fs nonlinear lithography and plasma etching for the fabrication of functional photonic devices with 3-D surfaces of inorganic materials. In this study, we report the nonlinear lithographic properties using fs laser pulses focused by a low-NA objective lens. Diffraction gratings were written directly inside the pre-baked resists by fs laser nonlinear absorption. From diffraction efficiencies using He-Ne laser light, refractive indices were changed by 8 x 10(-3) without PEB treatment which was required for cross-linking reaction. In contrast, no changes of refractive index were observed in the case of ultraviolet light exposure (i-line). Considering this large refractive index change and the threshold intensity of nonlinear absorption of the resist, self-guiding of fs laser pulses can occur due to the optical confinement in the radial direction. In fact, filamentary patterns which were optical-axially asymmetric and longer than the focal depth could be obtained without translating the focal spot using this lithographic property.
  • Mizue Mizoshiri, Hiroaki Nishiyama, Junji Nishii, Yoshinori Hirata
    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 98 1 171 - 177 2010年01月 [査読有り][通常論文]
     
    We report the fabrication of three-dimensional (3-D) SiO2 surfaces using femtosecond-laser lithography-assisted micromachining, which is a combined process of nonlinear lithography and plasma etching. Using pattern transfer of photoresist structures written by femtosecond laser-induced nonlinear absorption, SiO2-based Fresnel lens arrays with 3-D surfaces were obtained for this study. Using the open-aperture z-scan method, the femtosecond laser two-photon absorption coefficient of the KMPR resist was estimated as 17-23 cm/TW, assuming that single-photon absorption was negligible. By adding O-2 to the etching gas (CHF3) during pattern transfer, the surface roughness of the transferred structures was reduced to RMS 16.90 nm, which corresponds to one quarter of that without adding O-2. When 632.8-nm-wavelength light was coupled to the lenses with 3-D surfaces, the focal length was measured as 2790 mu m, which agreed well with the theoretical value.
  • N. Yamashita, T. Suetsugu, N. Kitamura, K. Fukumi, J. Nishii
    OPTICAL COMPONENTS AND MATERIALS VII 7598 2010年 [査読有り][通常論文]
     
    A one-dimensional periodic sub-wavelength structure (SWS) was fabricated on a glass plate by a glass-imprinting method. Thermal and optical properties of lithium bismuth gallium borate glasses were investigated for the development of glass suitable for the glass-imprinting method. It was found that refractive index and absorption edge energy showed additivity for glass composition and that the substitution of fluorine atoms for oxygen atoms reduced deformation temperature and increase transparency near uv region. The glass had a refractive index higher than 1.80 at 587 nm, internal transmittance higher than 80% (3 mm in thickness) at 400 nm, and deformation temperature lower than 470 degrees C was obtained. A one-dimensional SWS with a period of 300 nm on an SiC mold was transferred to the glass surface by the glass-imprinting method, which showed the phase retardation due to form birefringence.
  • Kenji Kintaka, Katsuya Shimizu, Yuki Kita, Satoshi Kawanami, Junichi Inoue, Junji Nishii
    2010 23RD ANNUAL MEETING OF THE IEEE PHOTONICS SOCIETY 411 - + 2010年 [査読有り][通常論文]
     
    An optical waveguide demultiplexer for wavelength-division-multiplexing intra-board chip-to-chip optical interconnects is proposed, designed, and fabricated by integration of cavity-resonator-integrated grating input/output couplers and distributed Bragg reflectors. Two-channel demultiplexing is successfully demonstrated for the first time.
  • 西井 準治, 金高 健二, 田和 圭子
    機能材料 29 11 35 - 42 2009年11月 [査読有り][通常論文]
  • Naoyuki Kitamura, Kohei Fukumi, Junji Nishii, Nobuhito Ohno
    JOURNAL OF NON-CRYSTALLINE SOLIDS 355 45-47 2216 - 2219 2009年11月 [査読有り][通常論文]
     
    We have studied the temperature coefficient of the refractive index of synthetic silica glasses with various hydroxyl impurities. The refractive index was measured at 15 degrees C and 35 degrees C at 1.707-0.238 mu m wavelengths. The temperature coefficient of a low-OH group (110 wt. ppm) containing glass increased from 8.0 +/- 0.2 x 10(-6)/degrees C (at 1.707 mu m) to 14.0 +/- 0.2 x 10(-6)/degrees C (at 0.238 mu m), although it increased respectively from 7.0 +/- 0.2/degrees C to 12.0 +/- 0.2 x 10(-6)/degrees C for a high-OH group (1300 wt. ppm) containing glass. The three-term Sellmeier equation, having two terms with resonance photon energies in the vacuum ultraviolet region and one term in the infrared region, was used to analyze the wavelength dispersion of the refractive index. Increasing temperatures shifted the resonance energy in the second term by -4.14 +/- 0.4 x 10(-4) eV/degrees C for low-OH (110 wt. ppm) glass and -2.64 +/- 0.4 x 10(-4) eV/degrees C for high-OH (1300 wt. ppm) glass. The fundamental absorption edge in the vacuum ultraviolet region shifted by -8.8 +/- 0.7 x 10(-4) eV/degrees C for the low-OH glass and -6.3 +/- 0.7 x 10(-4) eV/degrees C for the high-OH glass in a region of 25-100 degrees C. Both high-OH glass shift rates were lower than low-OH glass shift rates. The lower temperature coefficient for the Si-OH-related band probably explains the smaller temperature coefficient for high-OH glass: the absorption band of Si-O-H structure is located at lower energy side close to the fundamental absorption band associated with the Si-O-Si structure. (C) 2009 Elsevier B.V. All rights reserved.
  • 微細構造の創成と光学素子への応用
    西井 準治, 田和 圭子, 金高 健二
    化学工業 60 10 58 - 64 2009年10月 [査読無し][通常論文]
  • Toshiharu Mori, Naoto Yamashita, Haruya Kasa, Kohei Fukumi, Kenji Kintaka, Junji Nishii
    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 117 1370 1134 - 1137 2009年10月 [査読無し][通常論文]
     
    One-dimensional periodic sub-wavelength structures (SWSs) with a period of 300 nm were fabricated on a bismuth germanoborate glass plate by a direct glass nanoimprint method using SiC molds. The borate glass had a refractive index of 1.82 at 587.6 nm wavelength, an internal transmittance higher than 80% at a thickness of 3 mm the visible wavelength region, and a deformation temperature of 468 degrees C. SWSs with height of a few hundred nanometers were simultaneously fabricated on both surfaces of the glass plate by the glass nanoimprint at 488 degrees C for 120 s with 8 MPa in pressure. The SWSs showed form birefringence. A phase retardation of 0.23 lambda was observed between transverse electric (TE)- and transverse magnetic (TM)-polarized beams at 400 nm wavelength. (C)2009 The Ceramic society of Japan. All rights reserved.
  • Yukie Yokota, Kosei Ueno, Saulius Juodkazis, Vygantas Mizeikis, Naoki Murazawa, Hiroaki Misawa, Haruya Kasa, Kenji Kintaka, Junji Nishii
    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 207 1 126 - 134 2009年09月 [査読無し][通常論文]
     
    This work describes fabrication of three-dimensionally nano-textured silicon surface structures metalized by thin gold films,and their application for optical sensing and detection of solute molecules utilizing surface-enhanced Raman scattering (SERS) effect. Two types of sensitive surfaces were prepared by different techniques. The first of them was a checkerboard pattern of 3D nanoblocks defined in compact areas on the surface of a silicon wafer using highly accurate electron-beam lithography (EBL) technique, and fabricated by dry reactive-ion etching (RIE) technique with subsequent metalization of the surface by gold sputtering. The second type of sensitive surface consisted of a square array of nano-apertures. defined on a large area of the silicon surface by a less accurate but simpler ultraviolet holographic lithography, and subsequently fabricated in a sequence of dry and wet etching as well as gold sputtering steps. The fabricated structures were found to exhibit significant near-field enhancement, as evidenced by strong SERS signal from the sensors immersed in aqueous pyridine solutions with concentrations as low as 10(-9) M due to the presence of well-defined 3D periodic texture of the structure. (C) 2008 Elsevier BY. All rights reserved.
  • Xiaoqiang Cui, Keiko Tawa, Hironobu Hori, Junji Nishii
    APPLIED PHYSICS LETTERS 95 13 113117/1 - 113117/3 2009年09月 [査読有り][通常論文]
     
    One-dimensional gratings with different duty ratios were designed and implemented for enhanced fluorescence detection and imaging. Verified by finite difference time domain simulations, our results showed that the enhancement strongly depended on the duty ratio of the land width to pitch of the grating structure. The maximum enhancement factor was achieved when the duty ratio was equal to 0.50 in our trapezoidal gratings with pitch=400 nm and depth=20 nm. Such a facile grating mold will exert a considerable influence on microarray biosensors and fluorescence microscopy. (C) 2009 American Institute of Physics. [doi:10.1063/1.3238562]
  • Yamashita Naoto, Suetsugu Tatsuya, Einishi Toshihiko, Fukumi Kohei, Kitamura Naoyuki, Nishii Junji
    PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B 50 4 257 - 261 2009年08月 [査読有り][通常論文]
  • ガラスインプリント法によるサブ波長光学素子の形成
    西井 準治, 田中 康弘, 波多野 卓史
    応用物理 78 7 655 - 658 2009年07月 [査読有り][通常論文]
  • SiO2-based microstructures fabricated by femtosecond laser lithography
    M. Mizoshiri, H. Nishiyama, J. Nishii, Y. Hirata
    Journal of Physics: Conference Series 165 012048-1 - 012048-4 2009年07月 [査読有り][通常論文]
  • Naoko Akashi, Keiko Tawa, Yoshiro Tatsu, Kenji Kintaka, Junji Nishii
    JAPANESE JOURNAL OF APPLIED PHYSICS 48 6 06FH17-1 - 06FH17-7 2009年06月 [査読無し][通常論文]
     
    In this study, plastic grating substrates with subwavelength period were fabricated by nanoimprint lithography (NIL) and applied for the measurements of grating coupled-surface plasmon resonance (GC-SPR) field-enhanced fluorescence and fluorescence microscopic observation. Thermal and UV NIL were used for the fabrication of gratings. The grating fabricated by the latter process exhibited superior plasmon coupling characteristics to the former. The result of fluorescence detection indicated that the difference between the two structures fabricated by thermal and UV NIL affected the enhancement of fluorescence. Furthermore, the grating substrate with 39 nm groove depth fabricated by UV NIL produced an SPR dip, and it was found that the SPR of this grating substrate was dependent on duty ratio. The results of rigorous coupled wave analysis (RCWA) supported the experimental results well. The appropriate duty ratio of the grating fabricated by UV NIL with 39nm groove depth was 0.6 to 0.8. (C) 2009 The Japan Society of Applied Physics
  • Naoko Akashi, Keiko Tawa, Yoshiro Tatsu, Kenji Kintaka, Junji Nishii
    JAPANESE JOURNAL OF APPLIED PHYSICS 48 6 1 - 7 2009年06月 [査読有り][通常論文]
     
    Nanoimprint lithography (NIL) has recently been expected to be applied in the field of nanobiology. Substrates with a subwavelength grating pattern covered with metal layers can provide grating-coupled surface plasmon resonance (GC-SPR) under suitable condition. The GC-SPR field can selectively excite a fluorescent dye bound to the substrate and its fluorescence can be enhanced. In our earlier work, using a glass substrate with a grating fabricated by photolithography and dry etching, fluorescence images of labeled cells were taken with high sensitivity under a fluorescence microscope. However, this fabrication process requires a great deal of time. The replication of the subwavelength grating pattern on a polymer film by thermal NIL has an advantage in fabrication process economy. In this study, a grating substrate fabricated by NIL was applied to fluorescence microscopic observation based on GC-SPR and it provided more than six-times enhanced fluorescence images. (C) 2009 The Japan Society of Applied Physics
  • Toshiharu Mori, Yoshihisa Kimoto, Haruya Kasa, Kenji Kintaka, Norihito Hotou, Junji Nishii, Yoshihiko Hirai
    JAPANESE JOURNAL OF APPLIED PHYSICS 48 6 1 - 4 2009年06月 [査読有り][通常論文]
     
    Mold shape has been optimized to fabricate one-dimensional glass gratings with a high aspect ratio. Comparison of experimental and simulated results demonstrated that a periodic groove with a tilted sidewall, a parabolic top tooth, and a large width was preferable to imprint high-aspect-ratio gratings on a glass surface. In particular, a mold with a parabolic top tooth and a wide groove was effective to increase the aspect ratio. In the case of a mold with a 500 nm period, a grating of 540 nm height could be imprinted under the respectively optimized imprinting parameters of 430 degrees C, 5 MPa, and 5 min. (C) 2009 The Japan Society of Applied Physics
  • Naoyuki Kitamura, Kohei Fukumi, Junichi Nakamura, Tatsuo Hidaka, Hidekazu Hashima, Yoshitaka Mayumi, Junji Nishii
    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS 161 1-3 91 - 95 2009年04月 [査読有り][通常論文]
     
    Optical properties were studied on ternary zinc bismuth phosphate glasses, which have two distinct glass-forming regions; low-P2O5 region and high-P2O5 region. Orthophosphate and isolated phosphate structures are dominant in the former region and metaphosphate and pyrophosphate structures are dominant in the latter region. Refractive index of the low-P2O5 glass (n(d) > 1.82) was relatively higher than that of the high-P2O5 glass (n(d) < 1.74). Factors of additive law of the molar refraction were calculated from the refractive index, molar fraction of each component and density according to Lorentz-Lorenz formula. The factors of ZnO and P2O5 for the high-P2O5 glass were almost the same as those for the low-P2O5 glass. The factor of Bi2O3 of the low-P2O5 glass was, however, smaller than that of the high-P2O5 glass, although the refractive index of the former was higher than that of the latter. The discrepancy between the refractive index and the factor of Bi2O3 was due to the molar volume of glasses, that is, the refractive index was affected by the packing density much more than the molar refraction in zinc bismuth phosphate glasses. Absorption edge and reflection peak of the low-P2O5 glass were situated at lower energies than those of the high-P2O5 glass. which was consistent with the difference in resonance energy of the wavelength dispersion of the factor of Bi2O3 in molar refraction. The existence of a Raman band at 160 cm(-1) in the low-P2O5 glass, which was not observed in the high-P2O5 glass, suggested the difference in the Bi-O bonding state between two glasses. (C) 2009 Elsevier B.V. All rights reserved.
  • Hori Hironobu, Tawa Keiko, Kintaka Kenji, Nishii Junji, Tatsu Yoshiro
    OPTICAL REVIEW 16 2 216 - 221 2009年03月 [査読有り][通常論文]
     
    The fluorescence intensity of a sample placed on a metal grating pattern is enhanced due to excitation by the electric field of the grating-coupled surface plasmon resonance (GC-SPR). The dependence of the enhancement on groove depth and surface profile was studied with the aim of improving the sensitivity of fluorescence detection. The enhancement was found to depend on the groove depth, with intensity most enhanced on grating substrate of about 20 nm depth, which produced an intensity about 30 times greater than that on a flat borosilicate glass substrate. Rigorous coupled wave analysis calculation showed that the shape of the groove influenced GC-SPR, suggesting that controlling not only the depth but also the shape of the grating surface profile can be an important factor in improving the sensitivity of detection by fluorescence microscopy. © 2009 The Optical Society of Japan.
  • Naoyuki Kitamura, Kohei Fukumi, Junji Nishii
    PHYSICS AND CHEMISTRY OF GLASSES-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART B 50 1 59 - 62 2009年02月 [査読有り][通常論文]
     
    The optical transmittance, refractive index and reflectivity were studied for ternary (60-x)ZnO center dot xSnO center dot 40B(2)O(3) (x=20-60) glasses. The absorption edge energy varied from 3.05 to 2.82 eV with a change of SnO concentration from x=20 to 60 mol%, and the refractive index n(d) increased monotonically from 1.743 to 1.895. According to all analysis using a one-term Sellmeier equation, the resonance energy shifted from 8.2 to 6.7 eV as the SnO concentration increased. The shift of the resonance energy is quite different from that of the absorption edge energy. A broad peak was observed around 4.8 eV in the reflection spectra for all the glasses. The peak position shifted slightly from 4.8 to 4.7 eV as the SnO concentration increased. In addition, a broad shoulder ranging over 3.5-4.3 eV was observed. The intensity of the shoulder as the SnO concentration, decreased and it became imperceptible for x=20. Therefore the shift of the absorption edge energy is deduced to be due to the shift of the 4.8 eV band and the change in intensity of the shoulder. The Raman spectra show bands from 620 to 1540 cm(-1), which are assigned to vibrations of borate groups. The 180 cm(-1) band, which is assigned to Sn-O vibration, decreased in intensity as the SnO concentration decreased and disappeared at x=20. Therefore the shoulder at 3.5-4.3 eV found in the reflection spectra may be due to structure related to this band.
  • Yamada Itsunari, Kintaka Kenji, Nishii Junji, Akioka Satoshi, Yamagishi Yutaka, Saito Mitsunori
    APPLIED OPTICS 48 2 316 - 320 2009年01月10日 [査読有り][通常論文]
     
    We examined the effect of an antireflection (AR) coating to enhance the TM transmittance of the wire-grid polarizer. The polarization transmission spectra were calculated using the rigorous coupled-wave analysis. As a result, we verified that an AR film should be inserted between a wire-grid and a Si substrate as regards the TM transmittance and the polarization function. Based on the simulation results, we fabricated a tungsten silicide (WSi) wire-grid polarizer with SiO films on both sides of the Si substrate. The transmittance exceeded 80% at a 4-5 μm wavelength range, although the theoretical transmittance of Si substrate is 54% and the ratio of the TM and TE transmittances reached 24 dB at a 3 μm wavelength when the WSi grating has a 300 nm thickness, a 400 nm period, and a fill factor of 0.6. Wire-grid polarizers with higher transmittance and larger extinction ratio can be obtained by adjusting the AR film thickness, the fill factor, and the thickness of the WSi grating. © 2009 Optical Society of America.
  • Yamada I, Kintaka K, Nishii J, Akioka S, Yamagishi Y, Saito M
    Applied optics 48 2 316 - 320 2 2009年01月 [査読有り][通常論文]
     
    We examined the effect of an antireflection (AR) coating to enhance the TM transmittance of the wire-grid polarizer. The polarization transmission spectra were calculated using the rigorous coupled-wave analysis. As a result, we verified that an AR film should be inserted between a wire-grid and a Si substrate as regards the TM transmittance and the polarization function. Based on the simulation results, we fabricated a tungsten silicide (WSi) wire-grid polarizer with SiO films on both sides of the Si substrate. The transmittance exceeded 80% at a 4-5 μm wavelength range, although the theoretical transmittance of Si substrate is 54% and the ratio of the TM and TE transmittances reached 24 dB at a 3 μm wavelength when the WSi grating has a 300 nm thickness, a 400 nm period, and a fill factor of 0.6. Wire-grid polarizers with higher transmittance and larger extinction ratio can be obtained by adjusting the AR film thickness, the fill factor, and the thickness of the WSi grating. © 2009 Optical Society of America.
  • Kenji Kintaka, Xiaoqiang Cui, Keiko Tawa, Junji Nishii
    Optics InfoBase Conference Papers 2009年 
    Silver-coated two-dimensional periodic structures were fabricated for high-efficiency excitation of surface plasmon resonance. The fluorescence image of labeled proteins on the periodic structure was 100 times as bright as that on a flat glass plate. © 2009 Optical Society of America.
  • Hiroaki Nishiyama, Junji Nishii, Yoshinori Hirata
    Journal of Physics: Conference Series 165 2009年 [査読有り][通常論文]
     
    We firstly observed the surfaces of periodic structures consisting of Ge nanoparticles in channel waveguide cores of GeO2-B2O 3-SiO2 glasses. Such periodic structures were formed only by direct laser writing and subsequent annealing. Refractive index patterns were written in the glass films by irradiation with KrF excimer laser pulses. Then, the patterns were inverted by thermo-induced precipitation of Ge nanoparticles at unirradiated areas. Brown channel cores were obtained due to predominant precipitation of the nanoparticles in the cores. The periodic structures of 530 nm pitch and microchannels were directly observed by using wet-etched samples. The periodic structures were confirmed only inside the cores. © 2009 IOP Publishing Ltd.
  • M. Mizoshiri, H. Nishiyama, J. Nishii, Y. Hirata
    Journal of Physics: Conference Series 165 2009年 [査読有り][通常論文]
     
    We developed a technique for the formation of nonplanar surfaces of inorganic optical materials by a combined process of nonlinear lithography and plasma etching. This technique can be used to fabricate structures even on non-flat substrates, which is difficult using current semiconductor technology. Three-dimensional patterns were written directly inside a positive-tone photoresist using femtosecond laser-induced nonlinear optical absorption. The patterns were then transferred to underlying nonplanar substrates by the ion beam etching technique. For the lithographic process, we obtained a minimum feature size of 900 nm, which is below the diffraction limit. We demonstrated the fabrication of silica-based hybrid diffractive-refractive lenses. Fresnel zone plates with smooth surfaces were obtained on convex microlenses. When a 633-nm-wavelength He-Ne laser was coupled normally to the hybrid lens, the primary focal length was measured as 630 μm. This hybridization shifted the focal length by 200 μm, which agreed with the theoretical value. Our process is useful for the precise fabrication of nonplanar structures based on inorganic materials. © 2009 IOP Publishing Ltd.
  • Kazuhiro Yamada, Makoto Umetani, Takamasa Tamura, Yasuhiro Tanaka, Haruya Kasa, Junji Nishii
    APPLIED SURFACE SCIENCE 255 7 4267 - 4270 2009年01月 [査読有り][通常論文]
     
    An antireflective structure with two-dimensional 300-nm periodicity was fabricated on a phosphate glass surface using an imprinting process with a SiC mold. The optimized structure designed using RCWA calculation was a convex circular cone sharing the ridge line of adjacent cones. The SiC mold was fabricated using electron beam drawing and subsequent reactive ion etching with CHF(3) and O(2) gases. The glass' surface reflectance was estimated as 0.2% at 530 nm wavelength, which was approximately 1/20 that of the optically polished surface. (C) 2008 Elsevier B.V. All rights reserved.
  • Kenji Kintaka, Junji Nishii, Tomoyuki Muranishi, Katsuya Shimizu, Junichi Inoue, Kenzo Nishio, Shogo Ura
    2009 14TH OPTOELECTRONICS AND COMMUNICATIONS CONFERENCE (OECC 2009) 648 - + 2009年 [査読有り][通常論文]
     
    A 45-degree micromirror was fabricated in a SiO2-based single-mode waveguide by using liquid immersion exposure for the first time. Both output coupling and input coupling between a guided wave and a free-space wave were demonstrated experimentally.
  • Mizue Mizoshiri, Hiroaki Nishiyama, Toshio Kawahara, Junji Nishii, Yoshinori Hirata
    APPLIED PHYSICS EXPRESS 1 12 127001-1 - 127001-3 2008年12月 [査読有り][通常論文]
     
    In this study, we created nonplanar structures of inorganic optical materials by femtosecond (fs) laser lithography-assisted micromachining, which is a combined process of nonlinear lithography and plasma etching. Three-dimensional patterns, formed inside a positive-tone resist by fs laser exposure, were transferred to the underlying nonplanar substrates by plasma etching. This process enables fabrication of Si lines with a constant width of 5 mu m, even on a 65-mu m-high step. We demonstrated the fabrication Of SiO2-based micro-Fresnel zone plates on convex lenses. This hybridization shifted the focal length of the lens by 200 mu m, which was consistent with the theoretical value. (C) 2008 The Japan Society of Applied Physics
  • Hiroaki Nishiyama, Mizue Mizoshiri, Toshio Kawahara, Junji Nishii, Yoshinori Hirata
    OPTICS EXPRESS 16 22 17288 - 17294 2008年10月 [査読有り][通常論文]
     
    SiO2-based hybrid diffractive-refractive microlenses were fabricated by femtosecond laser lithography-assisted micromachining, which is a combined process of nonlinear lithography and plasma etching. The high-aspect-ratio patterns of resist were formed by laser exposure without translating the laser spot. By scanning this rod three-dimensionally, micro-Fresnel lens patterns were written directly inside resists on the convex lenses. Then, the resist patterns were transferred to the underlying lenses by CHF3 plasma. We obtained SiO2 nonplanar structures with smooth surfaces. This hybridization shifted the focal length of the lens by 216 mu m, which was consistent with theoretical value. (C) 2008 Optical Society of America
  • Naoto Kobayashi, Toshiharu Mori, Tatsuya Suetsugu, Noriyuki Wada, Junji Nishii, Takashi Wakasugi, Kohei Kaidono
    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 116 1356 875 - 879 2008年08月 [査読有り][通常論文]
     
    Glasses having a low softening temperature are desired for compression molding techniques in order to lengthen the mold life. The final goal of this research is to obtain glasses, which are suitable for the precise molding in order to fabricate micro- to submicro-structures on the glass surfaces, utilizing the ion-exchange technique, which lowers the softening temperature of only the surface regions of the glasses. We examined variations in optical and thermal properties of a soda-lime silicate glass after ion-exchange in AgNO3-NaNO3 molten salts under various conditions. The glass transition and softening temperatures were lowered after the ion-exchange by 80 K and 70 K, respectively. Molding tests were demonstrated for the ion-exchanged glasses using a glassy carbon mold having a one-dimensional periodical structure of 500 nm in frequency and 350 nm in depth within the area of 6 x 6 mm(2). It was found that the structure was successfully transferred on a part of the surface of the ion-exchanged glass at a lower temperature than that for the glass before ion-exchange. (C) 2008 The Ceramic Society of Japan. All rights reserved.
  • Toshiharu Mori, Kento Hasegawa, Takuji Hatano, Haruya Kasa, Kenji Kintaka, Junji Nishii
    Japanese Journal of Applied Physics 47 6 4746 - 4750 2008年06月13日 [査読有り][通常論文]
     
    Using direct glass imprinting with glassy carbon molds, one-dimensional surface-relief gratings with 500 nm pitch were fabricated on phosphate glasses. The maximum grating height attained in this study was 730 nm, which was formed by pressing at the softening temperature of the glass at a constant pressure of 0.4 kN/cm2. A large area pattern 6×6 mm2 with a 350-nm groove depth was also fabricated. Phase retardation of 0.1 λ was attained between transverse electric (TE)- and transverse magnetic (TM)-polarized light in the visible wavelength region. Calculated retardation using a rigorous coupled wave analysis agreed well with the experimental results. ©2008 The Japan Society of Applied Physics.
  • Yusuke Himei, Tomohiro Nagakane, Kohei Fukumi, Naoyuki Kitamura, Junji Nishii, Akihiko Sakamoto, Kazuyuki Hirao
    JOURNAL OF NON-CRYSTALLINE SOLIDS 354 27 3113 - 3119 2008年06月 [査読有り][通常論文]
     
    Reduction in the temperature coefficient of the optical path length, dS/dT of Li2O-Al2O3-SiO2 glass-ceramics with near-zero thermal expansion coefficient was attempted using control of the temperature coefficient of electronic polarizability, phi, and the thermal expansion coefficient, alpha. The dS/dT value of 2.6 mol% B2O3-doped glass-ceramic was 12.5 x 10(-6)/degrees C, which was 0.9 x 10(-6)/degrees C smaller than that of B2O3-free glass-ceramic. On the other hand, reduction in dS/dT through B2O3 doping was not confirmed in precursor glasses. Results showed that reduction in dS/dT of the glass-ceramic through B2O3 doping is caused by the reduction in phi. The reduction in phi from B2O3 doping was probably attributable to numerical reduction in non-bridging oxide ions with larger phi value by the concentration of boron ions in the residual glass phase. In addition, application of hydrostatic pressure during crystallization was effective to inhibit precipitation of beta-spodumene solid solution, which thereby decreases dS/dT. The dS/dT value of B2O3-doped glass-ceramic crystallized under 196 MPa was 11.7 x 10(-6)/degrees C. That value was slightly larger than that of silica glass. The a value of this glass-ceramic was smaller than that of silica glass. (C) 2008 Elsevier B.V. All rights reserved.
  • Keiko Tawa, Hironobu Hori, Kenji Kintaka, Kazuyuki Kiyosue, Yoshiro Tatsu, Junji Nishii
    OPTICS EXPRESS 16 13 9781 - 9790 2008年06月 [査読有り][通常論文]
     
    On the substrate carrying a sub-wavelength grating covered with a thin metal layer, a fluorescent dye-labeled cell was observed by fluorescence microscope. The fluorescence intensity was more than 20 times greater than that on an optically flat glass substrate. Such a great fluorescence enhancement from labeled cells bound to the grating substrate was due to the excitation by grating coupled surface plasmon resonance. The application of a grating substrate to two-dimensional detection and fluorescence microscopy appears to offer a promising method of taking highly sensitive fluorescence images. (c) 2008 Optical Society of America.
  • Three-dimensional surfaces of inorganic materials fabricated by femtosecond laser lithography
    H. Nishiyama, M. Mizoshiri, J. Nishii, Y. Hirata
    PIERS Proceedings 1 1322 - 1325 2008年03月 [査読有り][通常論文]
  • T. Mori, K. Hasegawa, T. Hatano, H. Kasa, K. Kintaka, J. Nishii
    OPTICS LETTERS 33 5 428 - 430 2008年03月 [査読有り][通常論文]
     
    Surface-relief gratings with high spatial frequencies were first fabricated using a direct imprinting process with a glassy carbon mold at the softening temperature of phosphate glass. A grating with maximum height of 730 nm and 500 nm period was formed on the glass surface by the pressing at the softening temperature of glass under constant pressure of 0.4 kN/cm(2). Phase retardation of 0.1 lambda was observed between TE-polarized and TM-polarized light at 600 nm wavelength. (C) 2008 Optical Society of America.
  • フェムト秒レーザリソグラフィによるシリカガラス製屈折回折複合レンズ構造の作製
    溝尻 瑞枝, 西山 宏昭, 西井 準治, 平田 好則
    「エレクトロニクスにおけるマイクロ接合・実装技術」シンポジウム論文集 1 293 - 298 2008年02月 [査読有り][通常論文]
  • Ura Shogo, Kintaka Kenji, Awazu Hideyuki, Nishio Kenzo, Awatsuji Yasuhiro, Nishii Junji
    APPLIED PHYSICS EXPRESS 1 2 22005 - 022005-3 Japan Society of Applied Physics 2008年02月 [査読有り][通常論文]
     
    A new simple interference exposure method using a phase-shifting mask was discussed on the basis of Fourier synthesis for fabricating blazed gratings. Phase-shifting mask was designed with 244 nm exposure-light wavelength to launch multiple diffraction beams so that resultant interference pattern fit to required optical intensity profile. Fine surface-relief pattern on SiO2 mask for 3-μm-period sawtooth optical-intensity profile was fabricated by electron-beam direct-writing lithography with 30 nm scanning step and relief height of 65 nm. Sawtooth-like intensity profile was demonstrated with theoretically predicted interference visibility.
  • Itsunari Yamada, Kenji Kintaka, Junji Nishii, Satoshi Akioka, Yutaka Yamagishi, Mitsunori Saito
    OPTICS LETTERS 33 3 258 - 260 2008年02月 [査読有り][通常論文]
     
    An infrared (IR) polarizer with tungsten silicide (WSi) wire grid was fabricated by two-beam interference exposure and reactive ion etching. To enhance TM transmittance, silicon monoxide was deposited between the WSi wire grid (400 nm period) and a Si substrate. The transmittance was over 80% in the 4-5 mu m wavelength range. The ratio of TM and TE transmittances was over 100 (20 dB) in the 2.5-6 mu m wavelength range. The fabricated polarizer has higher durability and bettter compatibility with microfabrication processes compared with conventional IR polarizers. (C) 2008 Optical Society of America.
  • M. Mizoshiri, H. Nishiyama, J. Nishii, Y. Hirata
    NANOENGINEERING: FABRICATION, PROPERTIES, OPTICS, AND DEVICES V 7039 70390E-1 - 70390E-8 2008年 [査読無し][通常論文]
     
    SiO2-based variable microfluidic lenses were fabricated by femtosecond laser lithography-assisted micromachining (FLAM). Optofluidic devices have attracted much interest because the adaptive nature of liquids in microfluidics enables unique optical performance that is not achievable within all solid state devices. SiO2-based microfluidic devices are, particularly, attractive due to high transparency, physical and chemical stabilities. However, it is generally rather difficult to form the microstructures in microchannels because photolithography process is limited to planar substrates. In our study, we fabricated SiO2-based variable microfluidic lenses, which had micro-Fresnel lenses inside the channels, by using FLAM, which was a combined process of nonlinear lithography and plasma etching. The resist patterns of the Fresnel lenses were directly written inside chemically amplified negative-tone photoresist on SiO2-based microchannels of 250 mu m width and 6 mu m depth using femtosecond laser-induced nonlinear optical absorption. Following that, the patterns were transferred to the bottom of the channels by using CHF3 and O-2 mixed plasma. SiO2-based Fresnel lenses with smooth surface were formed on the bottoms. When the channel was filled with the air, the focal spot was observed 2020 mu m from the tens surface. By injecting silicone oil into the channel, the incident light was switched to the dispersed.
  • H. Nishiyama, M. Mizoshiri, J. Nishii, Y. Hirata
    PHOTONIC FIBER AND CRYSTAL DEVICES: ADVANCES IN MATERIALS AND INNOVATIONS IN DEVICE APPLICATIONS II 7056 70561F-1 - 70561F-2 2008年 [査読有り][通常論文]
     
    SiO2-based diffractive/refractive hybrid microlenses were fabricated by using femtosecond laser-induced nonlinear optical processes. Recently, hybrid devices have received much attention as important components for optical pickup systems and integrated sensors. SiO2-based devices are particularly promising because of high transparency, physical and chemical stabilities. For these devices, microfabrication upon nonplanar substrates such as convex lenses, which is difficult for the semiconductor processes, is required. In this study, microFresnel lens patterns were directly written inside positive-tone resists upon convex microlenses of 240 mu m diameters by using femtosecond laser-induced nonlinear absorption. The spot diameters are primarily determined at any position inside the resist by the region volume at which the nonlinear absorption occurs. Therefore, the precise patterns could be formed even upon the nonplanar substrates. After post-exposure-bake and development treatment, the patterns were transferred onto underlying lenses by CHF3 plasma. Here, the etching depth was 1 mu m. Consequently, SiO2-based hybrid lenses with smooth surfaces were obtained. When He-Ne laser of 632.8 nm wavelength was coupled to this hybrid lens, the focal spot was 630 mu m from the lens surfaces. This focal length agreed with theoretical value of 618 mu m. More functional optical devices would be realized by improvement of fabrication processes.
  • H. Nishiyama, M. Mizoshiri, J. Nishii, Y. Hirata
    ADVANCED FABRICATION TECHNOLOGIES FOR MICRO/NANO OPTICS AND PHOTONICS 6883 68830E-1 - 68830E-8 2008年 [査読有り][通常論文]
     
    Silica-based nonplanar surface structures were fabricated by use of femtosecond laser lithography-assisted micromachining (FLAM), which is a combined process of femtosecond laser lithography and plasma etching. Diffractive optical elements (DOEs) are widely used for photonic applications such as optical pickup, interconnection and so forth. Most DOEs have been produced by semiconductor fabrication process. Although this process is useful to form complicated fine structures, there exist two problems. First, it is rather difficult to fabricate nonplanar surfaces including slopes and curves, which is effective to enhance diffraction efficiencies of DOEs. Second, microstructures cannot be fabricated onto nonplanar substrates. In the FLAM, nonplanar patterns are directly written inside resists by use of femtosecond laser-induced nonlinear optical absorption. Then, the patterns are transferred to underlying silica glasses by CHF3 plasma. By use of FLAM, we successfully fabricated silica-based microFresnel lenses including curves and slopes on planar substrates and cross-grating structures onto a convex microlens. In particular, as for the latter, uniform grating structures with smooth surfaces were observed even at top and curved regions of the lenses. The FLAM is expected to be useful for the fabrication of highly functional DOEs such as diffractive/refractive hybrid microlenses.
  • Kenji Kintaka, Junji Nishii, Shunsuke Murata, Shogo Ura
    Optics InfoBase Conference Papers 2008年 
    Eight-channel thin-film-waveguide WDM optical interconnect device with free-spacewave add-drop multiplexers consisting of focusing grating couplers (FGCs) and distributed Bragg reflectors was demonstrated for the first time by improvement of the FGC coupling efficiency. © 2008 Optical Society of America.
  • Junji Nishii
    Synthesiology 1 1 24 - 30 2008年 [査読有り][通常論文]
     
    Factors, such as production cost, which impede practical applications of "sub-wavelength optical elements" with periodic structures smaller than light wavelengths, were targeted for alleviation through a combination of advanced Japanese glass molding methods and a novel imprinting process. Collaboration between material manufacturers, consumer-electronics companies, universities, and AIST under a clear sharing of roles enabled the fabrication of functions such as polarization rotation effects and antireflection effects on glass surfaces.
  • T. Mori, K. Hasegawa, T. Hatano, H. Kasa, K. Kintaka, J. Nishii
    DEVICE AND PROCESS TECHNOLOGIES FOR MICROELECTRONICS, MEMS, PHOTONICS AND NANOTECHNOLOGY IV 6800 2008年 [査読有り][通常論文]
     
    One-dimensional surface-relief gratings were fabricated using a direct imprinting process with a glassy carbon (GC) mold at the softening temperatures of oxide glasses. The maximum grating height attained in this study was 730 nm when the grating period was 500 nm, which could be formed by the pressing at the softening temperature of glass under constant pressure of 0.4 kN/cm(2). A large area glass imprinting was attempted using a GC mold with a periodic patterned area of 6 mm x 6 mm, which has the period of 500 nm and groove depth of 350 run, respectively. Phase retardation of 0.1 lambda was recognized between TE-polarized and TM-polarized lights at 600 nm wavelength. The measured values were in excellent agreement with those calculated using a rigorous coupled wave analysis.
  • [Köchel 126] Modeling, fabrication, and characterization of tungsten silicide wire-grid polarizer in infrared region
    I. Yamada, J. Nishii, M. Saito
    Appl. Opt. 47 26 4735 - 4738 2008年 [査読有り][通常論文]
  • Junji Nishii
    OPTICAL DESIGN AND TESTING III, PTS 1 AND 2 6834 83403 - 83403 2008年 [査読有り][通常論文]
     
    Sub-wavelength periodic structures are very attractive for several optical elements with functions such as polarization-independent diffraction, isolation, antireflection, and phase control. In this paper I will review the fabrication of one- and two-dimensional periodic structures upon the surface of oxide glasses using lithograph, etching and glass imprinting. A 4-channel demultiplexer and a superprism demultiplexer were fabricated upon silica plates. The latter exhibited a precise linear relationship between the wavelength and the change of the output angle, which reached 4.8 degrees with the incident wavelength change of 1% for wavelengths of 1400-1500 nm. Fabrication of surface-relief gratings with high spatial frequencies directly on optical glasses was possible using an imprinting process. One-dimensional and two-dimensional periodic structures were formed reproducibly on a phosphate glass surface using thermally durable molds.
  • Kazuhiro Yamada, Makoto Umetani, Takamasa Tamura, Yasuhiro Tanaka, Junji Nishii
    ADVANCED FABRICATION TECHNOLOGIES FOR MICRO/NANO OPTICS AND PHOTONICS 6883 2008年 [査読有り][通常論文]
     
    Formation of a surface having a periodic. subwavelength structure (SWS) is a well-known technique for reducing the Fresnel reflection of transmissive optical elements. We fabricated an anti-reflective structured (ARS) surface with a two-dimensional periodic structure with the period of 300 nm on an optical glass by a precision molding process using a silica glass mold coated with a thin carbon film. The surface structure was formed on the mold using reactive ion etching (RIE) with fluorocarbon plasma. A thin chromium film was patterned using electron beam lithography and a wet etching process. The anti-reflective surface was formed on a phosphate glass with a deformation point of 412 degrees C and a refractive index of 1.60 at a wavelength of 462 rim. The phosphate glass was molded at 420 degrees C for 510 s under a pressure of 5 MPa. The height of the periodic structure on the mold was 550 nm and the height of that on the formed glass was 480 nm. Therefore, the filling rate of the phosphate glass to the mold was 87%. The surface reflectance of the glass was estimated as 0.56% at a wavelength of 462 nm, which was approximately 1/10 that of the optically polished surface.
  • Kenji Kintaka, Junji Nishii, Satoshi Yamaguchi, Takayuki Kobayashi, Shogo Ura
    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers 46 8 B 5499 - 5503 2007年08月23日 [査読有り][通常論文]
     
    Vertically Y-branched waveguides were designed and fabricated for constructing an intraboard chip-to-chip optical interconnection device with wavelength-division multiplexing at wavelength of 850-nm band. The vertically Y-branched waveguide is used for separating or contacting two vertically stacked waveguides, namely, a signal transmission waveguide and an add/drop waveguide. Coupling efficiency in mode splitting or combining was predicted to be 98% with a taper length of 160 μm and a splitting layer of 5-μm thickness. Two-dimensional vertical-Y-branch waveguides were fabricated on a SiO 2 substrate by plasma-enhanced chemical vapor deposition. Mode splitting and combining functions were demonstrated. © 2007 The Japan Society of Applied Physics.
  • Dong Jun Kang, Byeong-Soo Bae, Junji Nishii
    Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers 46 6 A 3704 - 3709 2007年06月06日 [査読有り][通常論文]
     
    We fabricated sub-wavelength periodic structures by thermal nano-imprinting using our original functionally modified inorganic-organic hybrid materials. The fabricated structures exhibited excellent uniformity and surface smoothness over a large imprinted area. In addition, optical transmittance is more than 90% within visible wavelength regions after heat treatment for 2h at 300°C. These nano-imprinted periodic structures showed high thermal durability without any structural changes after heating for 2h at 200°C, which is superior to commercially available organic imprinting materials. These nano-imprinted sub-wavelength periodic structures using our original inorganic-organic hybrid materials offer great potential for several applications in microphotonic and nanophotonic devices. © 2007 The Japan Society of Applied Physics.
  • N. Kitamura, K. Fukumi, J. Nishii, N. Ohno
    JOURNAL OF APPLIED PHYSICS 101 12 2007年06月 [査読有り][通常論文]
     
    The effect of impurity and density on refractive index was studied for silica glasses synthesized with direct, sol-gel, and vapor phase axial deposition (VAD) processes. Linear relationships between the refractive index and density n=C rho+D were found in a wide wavelength region from ultraviolet to infrared. The correlation coefficient C decreased from 0.081 +/- 0.007 cm(3)/g at 1.707 mu m to 0.061 +/- 0.008 cm(3)/g at 0.238 mu m. The relationship was different from those of the VAD or direct glasses formed by high-pressure densification, that is, the coefficient increased from 0.200 +/- 0.011 cm(3)/g at 1.707 mu m to 0.229 +/- 0.012 cm(3)/g at 0.238 mu m for VAD glass. Chlorine and hydroxyl impurities affected the refractive index; however, these impurities did not cause the linear relationship. After adjusting the index according to the chlorine related effect and the effect of the sample density, the difference between the sample's refractive indices Delta(n(2)-1) showed a similar dispersion relation irrespective of the synthetic process. An analysis using a two-term harmonic oscillator model suggested that the origin of the refractive index dispersion is the oxygen 2p-silicon 3s interband transition, as is the dispersion relation of silica glass. The difference in the refractive indices in these synthetic silica glasses is deduced to be due to a stoichiometric excess or deficiency of oxygen atoms of forms equivalent to Si-OH HO-Si equivalent to, equivalent to Si-Si equivalent to, equivalent to Si--SI, etc., and the density arising from these forms in these synthetic processes. (c) 2007 American Institute of Physics.
  • Hiroaki Nishiyama, Yoshinori Hirata, Isamu Miyamoto, Junji Nishii
    APPLIED SURFACE SCIENCE 253 15 6550 - 6554 2007年05月 [査読有り][通常論文]
     
    Thermally stabilized channel waveguides with Bragg gratings were fabricated by the space-selective precipitation technique of crystalline Ge nanoparticles using KrF excimer laser irradiation. The periodic structures consisting of Ge nanoparticles were formed in Ge-B-SiO2 thin glass films after exposure to an interference pattern of the laser followed by annealing at 600 degrees C. The channel waveguides with the periodic structures were fabricated by the cladding of the patterned Cr layers on the films. The diffraction peak for the TE-like mode of 11.8 dB depth was observed clearly at a wavelength of 1526.4 nm, indicating that the periodic structure also served as the optical band-pass filter in optical communication wavelength. The spectral shape, diffraction efficiency, and diffraction wavelength remained unchanged even after annealing at 400 degrees C. Furthermore, a low temperature dependence of the diffraction wavelength - as low as 8.1 pm/degrees C - was achieved. The diffraction efficiency was further enhanced after subsequent annealing at 600 degrees C. The space-selective precipitation technique is expected to be useful for the fabrication of highly reliable optical filters or durable sensing devices operating at high temperature. (C) 2007 Elsevier B.V. All rights reserved.
  • Microfabrication of nonplanar surface structures by femtosecond laser lithography
    H. Nishiyama, M. Mizoshiri, J. Nishii, Y. Hirata
    Proceedings of 8th International Symposium on Laser Precision Microfabrication 2007年04月 [査読有り][通常論文]
  • Hiroaki Nishiyama, Isamu Miyamoto, Yoshinori Hirata, Junji Nishii
    Optics Express 15 5 2047 - 2054 2007年03月05日 [査読有り][通常論文]
     
    Periodic structures consisting of Ge nanoparticles were formed in buried channel waveguides. Such periodic structures were created in GeO 2-B2O3-SiO2 thin glass films by the combination of exposure to interference patterns of ultraviolet laser light and thermally induced phase changes of the glasses. The periodic structures in the channels served as the Bragg gratings with high diffraction efficiencies in the optical communication wavelength. Transmission spectra measurements show the depths and positions of the diffraction peaks as 37.77 dB at 1536.2 nm and 38.72 dB at 1537.6 nm, respectively, for TE-like and TM-like modes. The diffraction efficiencies remain unchanged even after further annealing at temperatures as high as 500°C. © 2007 Optical Society of America.
  • Kageyama Junichi, Kintaka Kenji, Nishii Junji
    THIN SOLID FILMS 515 7-8 3816 - 3819 2007年02月26日 [査読有り][通常論文]
     
    Silicon nitride (SiN) thin films were deposited by a cathode coupling-type plasma enhanced chemical vapor deposition (PECVD) using two types of liquid sources, hexamethyldisilazane and trisdimethylaminosilane. The concentration of carbon impurities in the films could be reduced by minimizing the flow rates of these sources. The film deposited from the latter source exhibited the lowest transmission loss of 0.1 dB/cm at 1550 nm in wavelength. The deposition of SiN film from silane was also examined by an anode coupling-type PECVD. However, the scattering loss of the film was higher than those from the liquid sources, which was caused by the surface roughness of the film. © 2006 Elsevier B.V. All rights reserved.
  • Itsunari Yamada, Junji Nishii, Mitsunori Saito
    SMART STRUCTURES, DEVICES, AND SYSTEMS III 6414 2007年 [査読有り][通常論文]
     
    We fabricated an infrared wire-grid polarizer that was made of a tungsten silicide (WSi) grating on a Si substrate. The photolithography by the use of the two-beam interference was conducted for generating the short-period grating structure. This photoresist pattern was used as a mask for the reactive ion etching of the WSi coating and the Si substrate. Consequently, we could fabricate the WSi/Si grating with 400-nm period and 550-nm depth that acted as a wire-grid polarizer. The transmittance of TM polarization was 58% at 4-mu m wavelength, which exceeded the theoretical transmittance of Si (54%). This enhancement of the transmittance was caused by the reduction in the reflectance due to the subwavelength-grating structure. The extinction ratio at 2.7-mu m wavelength was 20 dB. We also measured the extinction coefficient K of WSi, and verified that WSi was a suitable polarizing material in the mid-infrared range.
  • Dong Jun Kang, Byeong-Soo Bae, Junji Nishii
    MICROMACHINING TECHNOLOGY FOR MICRO-OPTICS AND NANO-OPTICS V AND MICROFABRICATION PROCESS TECHNOLOGY XII 6462 2007年 [査読有り][通常論文]
     
    Micro- and nano-sized periodic structures are important components for wavelength dispersion, conversion, signal processing and modulation of optical signals. Thus, many micromachining technologies for the micro- and nano-sized patterns have been recently studied. Especially, nano-imprinting lithography has been rapidly developed as an attractive, low-cost alternative to photolithography and other lithographic techniques. Meanwhile, newly optimized materials for the specific nano-imprinting process have been continually required. Recently, the functionally modified inorganic-organic hybrid materials were found to have a highly efficient thermal curability, a high optical transparency in the visible and near infrared wavelength regions, and excellent mechanical and thermal properties once fully cured. In this study, we could successfully fabricate the micro- and nano-sized periodic structures by thermal nano-imprinting process using our original functionally modified hybrid materials. The fabricated structures exhibited the excellent uniformity and surface smoothness through a large imprinted area. In addition, the optical transparency is more than 90 % within visible and near infrared wavelength regions. These nano-imprinted periodic structures showed the highly thermal durability without any structural changes for 2 hours at 300 degrees C, which is much better than commercially available organic imprinting materials. Thus, these nano-imprinted sub-wavelength periodic structures using our original hybrid materials have great potentials for several applications to micro- and nano-photonic devices.
  • L. Chen, H. Nishimura, K. Fukumi, J. Nishii, K. Hirao
    Applied Surface Science 253 11 4906 - 4910 2007年 [査読有り][通常論文]
  • Se-Weon Choi, Hyeon-Taek Son, Chang-Seog Kang, Junji Nishii
    ADVANCES IN NANOMATERIALS AND PROCESSING, PTS 1 AND 2 124-126 515 - + 2007年 [査読有り][通常論文]
     
    Si and Er co-doped SiO2 films were fabricated by radio-frequency (RF) magnetron sputtering technique with a Si-Er-SiO2 target. The optical gain of 0.7 dB/cm was confirmed by the direct pumping of Er3+ using the laser diode (LD) of 980 nm in wavelength and 60 mW in output power. On the contrary, the pumping Si-nanocrystals by the Hg lamp 365 nm (1.5 W/cm(2)) induced the absorption loss above 1.48 mu m region in wavelength, which was attributed to the free carrier absorption of Si-nanocrystals.
  • Photon induced structural changes in SiO2 and related glasses by pulsed lasers
    J. Nishii, H. Nishiyama
    Proceedings of 1st International workshop on multiphoton processes in glass and glassy materials 1 49 - 63 2006年12月 [査読有り][通常論文]
  • N. Kitamura, K. Fukumi, J. Nishii, K. Takahashi, I. Mogi, S. Awaji, K. Watanabe
    Journal of Physics: Conference Series 51 1 462 - 465 2006年12月01日 [査読有り][通常論文]
     
    Flow behaviour has been observed in binary alkali phosphate glass melts (xR2O-2P2O5: R Li, K x 1, 3) under vertical magnetic field up to 3 T. The flow velocity of thermal convection decreased gradually to about one-third of the velocity at 0 T with an increase in magnetic field up to 1 T in the melt of low alkali content glass, and reached the constant value, under the condition of BdB/dz < 0. In contrast, the flow velocity was almost unchanged in the melt of high alkali content glass up to 3 T. On the other hand, the flow velocity decreased gradually to half of the velocity at 0 T with an increase in magnetic field in the melts of high alkali metal content glasses up to 3T, under the condition of BdB/dz> 0. The velocity decreased more gradually in the lithium containing melt than in the potassium containing melt. It was deduced from these observations that the flow behaviour under magnetic field was the resultant of balance between the thermomagnetic convection under the gradient of field and the electro-magnetic force by induced current. © 2006 IOP Publishing Ltd.
  • Kenji Sueyoshi, Hidenori Nagai, Shin-Ichi Wakida, Junji Nishii, Fumihiko Kitagawa, Koji Otsuka
    Measurement Science and Technology 17 12 3154 - 3161 2006年12月01日 [査読有り][通常論文]
     
    To achieve a high performance sample injection, we designed microchips with both T- and cross-type channel geometry (T-cross chip), which enables two sample solutions to be introduced into a separation channel simultaneously with desired volumes by a combination of gated and pinched injection techniques. The developed microchips were applied to microchip micellar electrokinetic chromatography (MCMEKC) using a partial filling (PF) technique. In the PF technique, to suppress the increase in the background noise due to the presence of a pseudostationary phase (PSP), e.g., ionic surfactant micelles in MCMEKC with mass spectrometric (MS) detection, in a background solution (BGS), the separation channel is partially filled with a PSP while the rest of the channel including the detection point is filled with the BGS without a PSP. As a result, both sodium dodecyl sulfate (SDS) micellar and sample solutions were simultaneously injected into the separation channel on the T-cross chip with a good repeatability of the injection lengths by applying programmed voltages, and a baseline separation of rhodamine derivatives was achieved within 40 s by MCMEKC, in which the micellar zone was partially injected with the PF technique. It was confirmed that the detection could be performed without any influence of SDS by the fluorescence imaging measurements. These results demonstrated that the developed T-cross chips will allow a combination of the MCMEKC separation with the MS detection by employing the PF technique for high performance analysis of biogenic compounds. In the PF-MCMEKC analysis, furthermore, the resolution of two rhodamines clearly increased from 1.30 to 1.73 with the increase of the injection length of PSP from 0.16 to 0.89 mm, whereas at the injection length of 1.47 mm the resolution decreased. Therefore, the selection of an optimal injection length on the T-cross chip is very important and the effects of the injection length on the separation processes in PF-MCMEKC were discussed on the basis of theoretical calculations. © 2006 IOP Publishing Ltd.
  • Hiroaki Nishiyama, Junji Nishii
    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 182 3 325 - 329 2006年09月 [査読有り][通常論文]
     
    Thermally stabilized photoinduced channel waveguides with Bragg gratings were fabricated in Ge-B-SiO2 thin glass films using the site-selective precipitation technique of Ge nanoparticles. Refractive index of the film increased after annealing longer than 10 min at 600 degrees C. Such increase of refractive index seems to be responsible for the precipitation of Ge nanoparticles in the film. However, irradiation prior to annealing suppressed the increase of refractive index. Consequently, the annealing reversed the photoinduced refractive index pattern and also enhanced its thermal stability. The stabilized channel waveguide with a Bragg grating showed diffraction efficiency of 18.0 and 18.7 dB for TE- and TM-like modes, respectively. The diffraction efficiencies and wavelengths for both modes never changed after heat treatment at 500 degrees C, whereas the conventional photoinduced grating decayed even at 200 degrees C. (c) 2006 Elsevier B.V. All rights reserved.
  • T Nagakane, Y Himei, N Kitamura, J Nishii, K Fukumi, A Sakamoto, K Hirao
    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 114 1326 180 - 183 2006年02月 [査読有り][通常論文]
     
    The optical property of Li2O-Al2O3-SiO2 glass-ceramic, with a near-zero thermal expansion coefficient, crystallized under high pressure has been studied. A hydrostatic pressure of 196 MPa was applied by a hot isostatic pressing (HIP) technique during the nucleation process and the crystal growth process. The temperature coefficient of the optical path length, 1/l.dS/dT, decreased by 0.6x10(-6) K-1, because the temperature coefficient of the refractive index, dn/dT, was decreased by the HIP treatment. The decrease in dn/dT was ascribed to the suppression of the temperature coefficient of the molar polarizability, phi, of the glass-ceramic crystallized by the HIP treatment. It was concluded that the suppression of phi occurs in the crystalline phase during the HIP treatment, based on the fact that the reduced 1/l.dS/dT was maintained even after the relaxation of the densified structure in the glass phase upon thermal annealing. The decrease in the number of lattice defects in the crystalline phase was hypothesized to be a cause of the reduced phi.
  • Seiji Sowa, Wataru Watanabe, Takayuki Tamaki, Junji Nishii, Kazuyoshi Itoh
    Optics Express 14 1 291 - 297 2006年01月09日 [査読有り][通常論文]
     
    We report on the fabrication of symmetric waveguides in bulk poly(methyl methacrylate) (PMMA) by femtosecond laser pulses. A waveguide with a circular transverse profile can be obtained by using a slit beam shaping method. The refractive index in the core increases by up to 4.6 × 10-4 and the waveguide works as single-mode waveguide at a wavelength of 632.8 nm. This writing technique is applied to the fabrication of a directional coupler to split a coupled beam with a 1:1 splitting ratio at 632.8 nm. © 2006 Optical Society of America.
  • Kenji Kintaka, Junji Nishii, Takahiro Matano, Akihiko Sakamoto
    Optics InfoBase Conference Papers 2006年 
    A F-B-SiO2 slab waveguide Bragg grating is fabricated on a multi-component crystallized glass substrate. A thermal shift of the Bragg wavelength as low as 3 pm/K, which is ~1/4 of a conventional device, is achieved. © 2005 Optical Society of America.
  • Hiroyuki Mochizuki, Toshiko Mizokuro, Kensuke Murai, Nobutaka Tanigaki, Junji Nishii
    Proceedings of SPIE - The International Society for Optical Engineering 6352 2006年 [査読有り][通常論文]
     
    We have explored a new doping method, which could disperse densely dyes into polymers, and have developed the present method into preparation of polymeric devices, such as storage media, luminescent media, switching devices, and waveguides. Preparation of the waveguide was based on dispersal of organofluorine (OF) compounds with a low refractive index in a polymer plate functioning as a cladding layer. The layer dispersed with the OF compound showed uniform concentration of the OF compound independent of the dispersal depth indicating that dispersion behavior was not governed by Fick's law. This means that the waveguide in the present study is step index. As a further development, we expanded the present method to preparation of a polymeric optical amplifier (POA) because reduction in intensity of a signal beam is clear due to driving of splitters in a short distance network using polymer optical fibers with large cores. A laser dye was dispersed densely within the core by the present method, followed by the dispersal of the OF compound to form the cladding layer resulting in the fabrication of POA with the large core. Amplification of the signal beam at 650 nm was confirmed in the waveguide upon irradiation of a pulsed laser.
  • Wataru Watanabe, Junji Nishii, Kazuyoshi Itoh
    FEMTOSECOND PHENOMENA AND NONLINEAR OPTICS III 6400 2006年 [査読有り][通常論文]
     
    When femtosecond laser pulses are tightly focused into a transparent material, the intensity in the focal volume is high enough to induce permanent structural modifications. Using these permanent structural modifications, one can micromachine structures inside the bulk of a transparent material in three-dimensions. I present the fabrication of photonic devices in transparent materials, including waveguides, couplers, diffractive lenses, and microfluidic channels in silica glass and PMMA. Applications of femtosecond laser micromachining include the joining of glass substrates by localized melting and resolidification.
  • A Sakamoto, J Nishii
    IEEE PHOTONICS TECHNOLOGY LETTERS 17 7 1462 - 1464 2005年07月 [査読有り][通常論文]
     
    A novel passive-alignment fiber Fabry-Wrot interferometer (FFPI) was developed by direct jacketing of an optical fiber with a low-expansion glass-ceramic (GC). It was first demonstrated that a transmission spectrum with no peak splitting is obtained by the FFPI developed. The polarization-dependent loss of this FFPI was also improved to one-third of the conventional FFPI fabricated with a ferrule and an organic adhesive. The transmission peak wavelength of the FFPI shows a sensitive linear temperature dependency. The FFPI with a GC jacket is expected as a promising candidate for narrow-band optical wavelength filters or temperature sensors that can be easily embedded in standard optical fiber connectors.
  • エキシマレーザ光照射によるガラスの構造変化
    西山 宏昭, 西井 準治
    レーザ加工学会誌 12 3 169 - 175 2005年06月 [査読有り][通常論文]
  • F Sato, A Sakamoto, S Yamamoto, K Kintaka, J Nishii
    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 113 1317 373 - 375 2005年05月 [査読有り][通常論文]
     
    We have fabricated a photonic crystal rod (PCR), which is a novel optical connecting component with a two-dimensional photonic crystal structure, by drawing a preform made of a multicomponent alkali-borosilicate glass. A hot vacuum (725 degrees C, 10 hPa) stacking method was developed for the fabrication of the preform, which enables self-organization of the inner structure of the preform. PCRs with sub-micrometer dimensional accuracy were successfully fabricated by drawing the preform at 820 degrees C, which is a much lower temperature than that used for the drawing of silica glass. The PCRs showed single-mode optical propagation at both wavelengths of 633 and 1550 nm with mode field diameters (MFDs) of 23.1 and 33.4 mu m, respectively. The bending strength of the PCR reached 850 MPa after ion-exchange treatment. PCR is expected to be a candidate for precision, high-strength, endlessly single-mode novel optical connecting components with large MFDs.
  • サブ波長周期構造の光デバイスへの応用
    西山 宏昭, 大家 和晃, 中澤 達洋, 西井 準治
    オプトロニクス 24 279 142 - 147 2005年03月 [査読有り][通常論文]
  • Kenji Kintaka, Junji Nishii, Atsushi Horii, Junpei Ohmori, Shogo Ura, Ryohei Satoh
    Optics InfoBase Conference Papers 2005年 
    100-Mb/s optical signals of 852 nm wavelength were transmitted for the first time through a thin-film waveguide with free-space-wave add-drop multiplexers consisting of focusing grating couplers and distributed Bragg reflectors for intra-board chip-to-chip optical interconnects. © 2005 Optical Society of America.
  • Kenji Kintaka, Junji Nishii, Takahiro Matano, Akihiko Sakamoto
    Optics InfoBase Conference Papers 2005年 
    A F-B-SiO2 slab waveguide Bragg grating is fabricated on a multi-component crystallized glass substrate. A thermal shift of the Bragg wavelength as low as 3 pm/K, which is ~1/4 of a conventional device, is achieved. © 2005 Optical Society of America.
  • Kenji Kintaka, Junji Nishii, Takahiro Matano, Akihiko Sakamoto
    Conference on Optical Fiber Communication, Technical Digest Series 1 141 - 143 2005年 
    A F-B-SiO2 slab waveguide Bragg grating is fabricated on a multi-component crystallized glass substrate. A thermal shift of the Bragg wavelength as low as 3 pm/K, which is ∼1/4 of a conventional device, is achieved. © 2005 Optical Society of America.
  • K. Oya, T. Nakazawa, S. Kittaka, K. Tsunetomo, K. Kintaka, J. Nishii, K. Hirao
    IET Conference Publications 2005 502 179 - 180 2005年 [査読有り][通常論文]
     
    We first fabricated the triangular one-dimesional Ta2O5 photonic crystal embedded in slab waveguide. Superprism effect, which was 1.7 times as large as that of our previous SiO2 photonic crystal, was attained in 100-nm wavelength region.
  • Junji Nishii, Choi Se-Weon, Hideo Hosono, Tetsuya Taguchi, Nobutaka Nakane, Hiroaki Samata, Yuma Oshitani, Mitsunori Saito
    IET Conference Publications 2005 502 2005年 [査読有り][通常論文]
     
    Loss of Er- and Si-nanocrystal co-doped waveguide increased reversibly and drastically by the top-pumping using 365-nm Hg lamp, suggesting the dense pumping even if by LED might be fatal to obtain a practical signal gain.
  • S. Kittaka, M. Nara, T. Nakazawa, K. Oya, K. Tsunetomo, J. Nishii
    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest 2005 930 - 931 2005年 [査読有り][通常論文]
     
    Channel waveguide of one-dimensional photonic crystal was fabricated and evaluated. Because of high order mode propagation on Brillouin zone boundary, light is strongly confined. Bending loss of right angle was 1.2dB.
  • Takayuki Tamaki, Wataru Watanabe, Junji Nishii, Kazuyoshi Itoh
    Japanese Journal of Applied Physics, Part 2: Letters 44 20-23 L687 - L689 2005年 [査読有り][通常論文]
     
    We report on laser welding between transparent materials without the insertion of intermediate layers such as glue by use of near-infrared femtosecond laser pulses. When femtosecond laser pulses are focused at the interface of transparent materials, the material around the focal point is melted and resolidified because of the temperature increases due to the localized nonlinear absorption of optical pulse energy. We experimentally succeeded in laser welding between two pieces of silica glass without the insertion of an intermediate layer by femtosecond laser pulses. This technique has a possible application to the joining of semiconductors such as silicon crystals. © 2005 The Japan Society of Applied Physics.
  • N Kitamura, K Fukumi, J Nishii
    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS 970 - 971 2005年 [査読有り][通常論文]
     
    Structural relaxation has been performed on the surface of high-pressure densified silica glass by the CO laser beam irradiation. Micro-bumps with Gaussian shape were formed on the glass surface after the laser irradiation. Micro-bumps were successfully arrayed at an interval of 25 mu m. This demonstrates us a novel method to produce micro-lens array.
  • H Nishiyama, Y Hirata, Miyamoto, I, J Nishii
    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS 974 - 975 2005年 [査読有り][通常論文]
     
    Crystalline Ge nanopartilces were aligned periodically in Ge-B-SiO2 waveguides. The periodic alignment structure, which was induced by irradiation with excimer laser pulses and successive annealing, served as thermally stabilized Bragg gratings with high diffraction efficiencies.
  • 微細周期構造による回折現象を利用した光導波路デバイス
    中澤 達洋, 大家 和晃, 西山 宏昭, 西井 準治
    応用物理 73 11 1418 - 1422 2004年11月 [査読有り][通常論文]
  • M Takahashi, A Sakoh, Y Tokuda, T Yoko, J Nishii, H Nishiyama, Miyamoto, I
    JOURNAL OF NON-CRYSTALLINE SOLIDS 345 323 - 327 2004年10月 [査読有り][通常論文]
     
    The photoluminescence spectra of the divalent Ge(Ge2+) center in GeO2-SiO2 glasses with different photosensitivities were investigated by means of excitation-emission energy mapping to correlate the ultraviolet light induced photorefractivity with the local structure around the Ge2+ centers. The glasses with a larger photorefractivity tended to exhibit a greater band broadening of the singlet-singlet transition to higher excitation energies accompanied by an increase in the Stokes shifts. This strongly suggests the existence of a highly photosensitive Ge2+ centers with higher excitation energies. It was also found that the introduction of a hydroxyl group or boron species modifies the local environment of Ge2+ leading to an enhanced photorefractivity. (C) 2004 Elsevier B.V. All rights reserved.
  • H Nishiyama, Miyamoto, I, S Matsumoto, M Saito, K Fukumi, K Kintaka, J Nishii
    APPLIED PHYSICS LETTERS 85 17 3734 - 3736 2004年10月 [査読有り][通常論文]
     
    Crystalline 20- to 40-nm-diam Ge nanoparticles were precipitated periodically in Ge-B-SiO2 thin glass films fabricated by the plasma-enhanced chemical vapor deposition method. Such a periodic structure was created by exposure to an interference pattern with a KrF excimer laser (248 nm wavelength) and successive annealing at 600degreesC. Nanoparticles were precipitated predominantly in the unirradiated region after photoinduced refractive index change was erased completely after annealing up to 500degreesC. (C) 2004 American Institute of Physics.
  • H Nishiyama, Miyamoto, I, S Matsumoto, M Saito, K Kintaka, J Nishii
    OPTICS EXPRESS 12 19 4589 - 4595 2004年09月 [査読有り][通常論文]
     
    Thermally stabilized photo-induced channel waveguides with Bragg gratings were fabricated in Ge-B-SiO2 thin glass films by exposure with KrF excimer laser and successive annealing at 600 degreesC. The annealing reversed the photo-induced refractive index pattern and also enhanced its thermal stability. The stabilized channel waveguide with a Bragg grating showed diffraction efficiency of 18.0 dB and 18.7 dB for TE- and TM-like modes, respectively. The diffraction efficiencies and wavelengths for both modes never changed after heat treatment at 500 degreesC, whereas the conventional photo-induced grating decayed even at 200 degreesC. (C) 2004 Optical Society of America.
  • J Nishii, K Kintaka, T Nakazawa
    APPLIED OPTICS 43 6 1327 - 1330 2004年02月 [査読有り][通常論文]
     
    Binary gratings were fabricated with high first-order diffraction efficiency by conventional electron-beam drawing and subsequent inductive coupled-plasma dry etching upon the surfaces of SiO2 glass plates. The gratings were covered with a thin SiO2 film by plasma-enhanced chemical-vapor deposition without the grooves' being filled in. The buried gratings exhibited first-order diffraction efficiencies of 84% for transverse-electric and 87% for transverse-magnetic polarized light at a wavelength of 1.55 mum when the period and the depth were 1.5 and 2.8 mum, respectively. (C) 2004 Optical Society of America.
  • J Nishii, K Hirao
    2004 INTERNATIONAL CONFERENCE ON MEMS, NANO AND SMART SYSTEMS, PROCEEDINGS 356 - 358 2004年 [査読有り][通常論文]
     
    Recent three topics of Nanotechnology Glass Project were described. (1) A proton-conducting hybrid material was fabricated using a glass plate with nano-pores. The conductivity of the hybrid glass plate was comparable to Nafion, and no corrosion or degradation observed up to 120degreesC. (2) Nano-particles of CdTe were synthesized in a water solution and embedded in the glass matrix using a sol-gel method. The emission quantum efficiency of 3% was attained. (3) Deep dry etching followed by overcladding buried the DOE with a deep groove inside a SiO2 plate, which was used for fabrication of an ultra small demultiplexer.
  • K Yamada, W Watanabe, K Kintaka, J Nishii, K Itoh
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 42 11 6916 - 6919 2003年11月 [査読有り][通常論文]
     
    A self-trapped filament of ultrashort laser pulses can induce a 10-500 mum-long region of refractive-index change in silica glass. The translation of filament perpendicular to the optical axis induces a layer of refractive-index change with a thickness of 2 mum. We stacked the layers periodically and fabricated volume gratings. We irradiated a He-Ne laser beam at the wavelength of 632.8 nm onto the gratings at the Bragg angle. The maximum diffraction efficiency was 74.8% with the grating that had the period of 3 mum and the thickness of 150 mum.
  • A Sakoh, M Takahashi, T Yoko, J Nishii, H Nishiyama, Miyamoto, I
    OPTICS EXPRESS 11 21 2679 - 2688 2003年10月 [査読有り][通常論文]
     
    The photoluminescence spectra of the divalent Ge (Ge2+) center in GeO2-SiO2 glasses with different photosensitivities were investigated by means of excitation-emission energy mapping. The ultraviolet light induced photorefractivity has been correlated with the local structure around the Ge2+ centers. The glasses with a larger photorefractivity tended to exhibit a greater band broadening of the singlet-singlet transition on the higher excitation energy side accompanied by an increase in the Stokes shifts. This strongly suggests the existence of highly photosensitive Ge2+ centers with higher excitation energies. It is also found that the introduction of a hydroxyl group or boron species in GeO2-SiO2 glasses under appropriate conditions modifies the local environment of Ge2+ leading to an enhanced photorefractivity. (C) 2003 Optical Society of America.
  • J Nishii, K Kintaka, H Nishiyama, M Takahashi
    JOURNAL OF NON-CRYSTALLINE SOLIDS 326 464 - 471 2003年10月 [査読有り][通常論文]
     
    Ge-SiO2 thin glass films photosensitive to excimer laser irradiation were fabricated by plasma enhanced chemical vapor deposition. A channel waveguide was successfully fabricated by irradiation with only an excimer laser through a Cr mask pattern, which was previously coated on the slab-waveguide by the sputtering method. Bragg gratings with high diffraction efficiency were also fabricated in the waveguide by another KrF laser irradiation through the phase mask without hydrogen loading. Channel waveguides with Bragg gratings, on the other hand, were fabricated on the glass ceramic substrates with negative thermal expansion coefficient. Doping of the B2O3 to Ge-SiO2 glass film effectively suppressed the temperature drift of the stop band (dlambda/dT) of the gratings. The dlambda/dT attained in this study was 4 pm/degreesC, which was less than one-third of those reported for commercially available waveguide gratings. Although the grating printed in the Ge-B-SiO2 film was almost erased by annealing at a temperature lower than 500 degreesC, a new type of grating with much higher diffraction efficiency than that before annealing was formed after annealing at 600 degreesC. The diffraction efficiency of the new grating was unchanged after repeated heating between room temperature and 600 degreesC. (C) 2003 Elsevier B.V. All rights reserved.
  • A Sakamoto, H Asano, M Wada, S Yamamoto, J Nishii
    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 111 9 640 - 644 2003年09月 [査読有り][通常論文]
     
    Novel silica glass single-mode optical fibers (SMFs) directly bonded with a low-expansion glass-ceramic jacket have been fabricated. Jacketing was performed by drawing a Li2O-Al2O3-SiO2 glass-ceramic preform. The SMF with glass-ceramic jacket (GC-SMF) exhibited a bending strength of 750 MPa, suitable for optical connecting components. The dimensional accuracy of GC-SMF with a 0.56-mm-thick glass-ceramic jacket was within the range of 1.4 mum in both roundness and concentricity, which are also adequate for optical connecting components. GC-SMF showed single-mode optical propagation with a small propagation loss at a wavelength of 1.3 mum. The optical performance of GC-SMF was maintained even after heat treatment at 750degreesC for 1 h, showing excellent high-temperature resistance, approximately 500degreesC higher than that of conventional SMF assemblies with organic adhesives. GC-SMF is regarded as a promising candidate for high-temperature-resistant optical connecting components, which are applicable to recently developed high-power optical communication systems.
  • M. Takahashi, A. Sakoh, K. Ichii, Y. Tokuda, T. Yoko, J. Nishii
    Applied Optics 2003年08月01日 [査読有り][通常論文]
  • Sang-Hun Jeong, Junji Nishii, Hyuk-Ryul Park, Jae-Keun Kim, Byung-Teak Lee
    Surface and Coatings Technology 168 1 51 - 56 2003年05月01日 [査読有り][通常論文]
     
    Influence of F incorporation into the SiO2 matrix was studied during SiOF film deposition using a conventional r.f. plasma enhanced chemical vapor deposition technique from a mixture of TEOS/O2/CF4. With increasing CF4 flow rate from 0 to 70 sccm, the fluorine content in the film varied from 0 to 5.5 at.% and the refractive index decreased from 1.46 to 1.41. In addition, Si-F2 bonds with hydrophile property were identified in the SiOF films deposited at CF4 flow rates above 50 sccm. In the Fourier transform infrared spectroscopy spectra of these films, however, the SiOH and OH absorption bands were hardly observed, indicating that these films have a strong resistance to water absorption. From the electron microscopy investigation and the analysis of optical spectra, it was also confirmed that all the SiOF films studied were homogeneous and had a dense and amorphous structure without micro-pores. © 2003 Elsevier Science B.V. All rights reserved.
  • 耐熱性光導波路フィルター
    西山 宏昭, 金高 健二, 西井 準治, 宮本 勇
    光アライアンス 14 4 24 - 27 2003年04月 [査読有り][通常論文]
  • K Kintaka, J Nishii, H Nishiyama, Y Kawamoto, A Sakamoto
    JOURNAL OF LIGHTWAVE TECHNOLOGY 21 3 831 - 836 2003年03月 [査読有り][通常論文]
     
    To realize athermal glass films, formation of Ge-B-SiO2 and F-B-SiO2 films by plasma-enhanced chemical vapor deposition (PECVD) was examined-on several substrates with various thermal expansion coefficients. Waveguide Bragg gratings were fabricated by irradiation with a KrF excimer laser light through a phase mask. A temperature dependence of the Bragg wavelength as low as 4 pm/degreesC was obtained in a 6GeO(2)-13B(2)O(3)-81SiO(2) (mol%) core and 13B(2)O(3)-87SiO(2) (mol %) cladding waveguide or in a 13B(2)O(3)-87SiO(2) (mol %) core, 6GeO(2)-13B(2)O(3)-81SiO(2) (mol%) grating layer and 6F(2)-10B(2) O-3-84SiO(2) (mol%) cladding waveguide on crystallized glass substrates with a thermal expansion. coefficient of -2.0 x 10(-6)/degreesC. Such temperature sensitivity is one third of conventional waveguide Bragg grating devices.
  • H Nishiyama, K Kintaka, J Nishii, T Sano, E Ohmura, Miyamoto, I
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 42 2A 559 - 563 2003年02月 [査読有り][通常論文]
     
    GeO2-B2O3-SiO2 thin films having excellent thermo- and photo-sensitivity were fabricated by the plasma enhanced chemical vapor deposition method. Bragg gratings with high diffraction efficiency:were formed in the films by irradiation with a KrF excimer laser through the phase mask without H-2 loading; The diffraction efficiency decreased rapidly by the annealing up to 500degreesC, but increased significantly at 600degreesC. Such an increase was closely related to the formation of intense absorption bands in the ultraviolet wavelength region. The growth of the thermo-induced index change was suppressed by the laser irradiation prior to the annealing. Thus the origin of the marked increase in diffraction efficiency was considered to be the formation of another type of grating with the reverse index pattern. This thermally stabilized grating was never erased by the repeated heat treatment between room temperature and 600degreesC.
  • K. Kintaka, J. Nishii, Y. Kawamoto, A. Sakamoto
    Conference on Optical Fiber Communication, Technical Digest Series 86 52 - 53 2003年 
    Waveguide Bragg gratings were fabricated using B-SiO2, Ge-B-SiO2, F-B-SiO2 films and a multi-component crystallized glass substrate. Optical characterization of the waveguide was carried out at ∼1.55 νm wavelength with a superluminescent diode or a tunable diode laser. The propagation loss of the waveguide was measured by the Fabry-Perot method. The Bragg wavelength shift against temperature as low as 4pm/K was obtained.
  • Y. Iga, W. Watanabe, T. Ishizuka, Y. Li, J. Nishii, K. Itoh
    Proceedings of SPIE - The International Society for Optical Engineering 5063 129 - 132 2003年 [査読有り][通常論文]
     
    By laser-micromachining from the rear surface that is in contact with distilled water, we can directly produce Three-dimensional micro-holes in silica glass. The micro-holes have the constant diameters of several microns and the high aspect ratios. In this paper, we present the morphological characteristics of the micro-hole. Femtosecond laser pulses (130-fs, 800 nm, 1-kHz) generated from an amplified Ti:sapphire laser were first focused onto the rear surface of the silica glass with the thickness of 1 mm by a 0.55-numerical aperture microscope objective. After 48 sequential pulses were launched into the sample, we moved the focal spot by a step of 1 micron toward the front surface. We fabricated micro-holes with the diameter of 4-8 microns by repeating the irradiation and the movement. We observed the morphology of the hole and the debris generated by the laser ablation. We also analyzed the capillary phenomenon in the dead-end micro-holes. We found two phases in the rising of the distilled water: the first phase occurred very fast within 0.1s and second phase was slow. This result agrees with the previous result (N. P. Migoun, et. al., Proc. 15th WCNDT, Roma (2000)) that used a glass capillary tube.
  • Hisami Nishi, Akira Matsumura, Junji Nishii
    Proceedings of SPIE - The International Society for Optical Engineering 4989 30 - 37 2003年 [査読有り][通常論文]
     
    Long-period fiber grating (LPFG) having grating periodicity in the hundreds of microns, functions as a band rejection filter. This device is useful for gain equalizing applications of fiber amplifiers. The transmission characteristics are mainly determined by the initial fabricating conditions such as grating periodicity and UV exposure time. Therefore, it was very difficult to tune the transmission characteristics with wide range after the LPFG was made. Many works have been reported to tune the resonant wavelength and depth of the dip point. But, tuning range of resonant wavelength was not so wide and resonant depth was not easy to control after the grating fabrication. In this paper, we have proposed, analyzed and evaluated the novel and simple method to tune the wavelength characteristics of LPFG after the grating fabrication. In this device, the grating is divided into two regions. One region is the conventional LPFG, and the other region is the modified LPFG surrounded outside the cladding with a medium having higher or lower refractive index than that of the cladding. In case of the higher refractive index, only resonant depth could be controlled over 20dB without resonant wavelength shift. In case of the lower refractive index, resonant wavelength could be moved around 40nm while resonant depth change is small. The experimental results were compared with the theoretical analysis. Both results showed good agreements.
  • Akihiko Sakamoto, Hideki Asano, Masanori Wada, Shigeru Yamamoto, Junji Nishii
    Journal of the Ceramic Society of Japan 111 1297 640 - 644 2003年 [査読有り][通常論文]
     
    Novel silica glass single-mode optical fibers (SMFs) directly bonded with a low-expansion glass-ceramic jacket have been fabricated. Jacketing was performed by drawing a Li2O-Al2O3-SiO 2 glass-ceramic preform. The SMF with glass-ceramic jacket (GC-SMF) exhibited a bending strength of 750 MPa, suitable for optical connecting components. The dimensional accuracy of GC-SMF with a 0.56-mm-thick glass-ceramic jacket was within the range of 1.4 μm in both roundness and concentricity, which are also adequate for optical connecting components. GC-SMF showed single-mode optical propagation with a small propagation loss at a wavelength of 1.3 μm. The optical performance of GC-SMF was maintained even after heat treatment at 750°C for 1 h, showing excellent high-temperature resistance, approximately 500°C higher than that of conventional SMF assemblies with organic adhesives. GC-SMF is regarded as a promising candidate for high-temperature-resistant optical connecting components, which are applicable to recently developed high-power optical communication systems.
  • Wataru Watanabe, Taishi Asano, Kazuhiro Yamada, Junji Nishii, Kazuyoshi Itoh
    Proceedings of SPIE - The International Society for Optical Engineering 4978 155 - 161 2003年 [査読有り][通常論文]
     
    Permanent refractive-index change can be induced by a self-trapped filament of infrared femtosecond laser pulses in silica glass. We present the fabrication of waveguides, couplers, and gratings by use of the self-trapped filament. The self-trapped filament with 30 μm long was found to bend from the direction of the incident laser pulses by two-dimensional translation. This technique leads to a formation of a permanent curved waveguide. We fabricate a 2-mm long directional coupler with the core diameter of 2 μm to split the coupled beam into 1:1. We also show the fabrication of gratings. Finally, we investigate the dependence of refractive-index change on polarization of incident laser pulses.
  • H Nishiyama, Miyamoto, I, K Kintaka, J Nishii
    THIRD INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION 4830 384 - 389 2003年 [査読有り][通常論文]
     
    We found out that GeO2-B2O3-SiO2 thin films fabricated by plasma enhanced chemical vapor deposition method exhibited not only large photo-induced but also thermo-induced refractive index increases, both of which were above 10(-3). The former was observed after irradiation with KrF excimer laser, and the latter was induced by annealing at 600degreesC The thermo-induced refractive index increase was closely related to the formation of thermo-induced absorption bands during the annealing, and could be suppressed by the laser irradiation prior to the, annealing. Bragg gratings were printed in the films by the laser irradiation through the phase mask without H-2 loading. The diffraction efficiency decreased rapidly by the annealing up to 500degreesC, but drastically increased after the annealing at 600degreesC. The thermo-induced gratings couldn't be erased by the repeated heat treatments between room temperature and 600degreesC at all. Considering the suppression of thermo-induced index increase by the laser irradiation, this grating was expected to have the reverse pattern of refractive index compared to that of the as-printed one, and might be applicable to the highly reliable optical and sensing devices.
  • J Nishii, K Kintaka, Y Kawamoto, A Mizutani, H Kikuta
    JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 111 1 24 - 27 2003年01月 [査読有り][通常論文]
     
    A two-dimensional microstructure with low reflectance was fabricated on the surface of an SiO2 plate by the precise regulation of its shape and surface morphology. A periodically dotted mask pattern of a positive resist was formed on SiO2 by a two-beam interference method using a He-Cd laser with a wavelength of 325 nm. The substrate was rotated by 90degrees between the first and second irradiation steps. The microstructure of SiO2 was etched using an electron cyclotron resonance plasma. The reflection loss was effectively minimized by overcoating an SiO2 thin film on the microstructure followed by chemical etching in an HF solution. Steady fabrication of subwavelength structures (SWSs) having a reflectance less than 0.1% was possible by using these surface treatment methods.
  • K Yamada, W Watanabe, K Kintaka, J Nishii, K Itoh
    FOURTH INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION 5063 474 - 477 2003年 [査読有り][通常論文]
     
    A self-trapped filament of ultrashort laser pulses can induce a several-hundred-micron-long region of refractive-index change in silica glass. The maximum refractive-index change and the diameter of refractive-index change are approximately 0.01 and 2 mum, respectively. The filament is 10-500 mum long along the pulse propagation axis and its length depends mainly on the numerical aperture of the focusing lens. In this paper, we present the fabrication experiment of volume gratings induced in silica glass by a self-trapped filament of ultrashort pulses. When the 150-mum-long filament was translated perpendicular to the optical axis by 300 mum, a layer of refractive-index change with the thickness of 2 mum was induced. We stacked the layers with a period of several microns and fabricated volume gratings. We entered a He-Ne laser beam at the wavelength of 632.8 nm to the grating with the Bragg angle to measure the diffraction efficiency. The maximum diffraction efficiency was 74.8% with the grating that had the period of 3 mum, and the thickness of 150 mum.
  • J Nishii, K Kintaka, H Nishiyama, T Sano, E Ohmura, Miyamoto, I
    APPLIED PHYSICS LETTERS 81 13 2364 - 2366 2002年09月 [査読有り][通常論文]
     
    Bragg gratings were printed in Ge-SiO2 and Ge-B-SiO2 thin glass films by KrF excimer laser irradiation through a phase mask. The diffraction efficiency of the grating printed in the Ge-B-SiO2 film was approximately one order of magnitude greater than that of the Ge-SiO2 film. Although the gratings were almost erased upon annealing at temperatures lower than 500 degreesC, a grating with much higher diffraction efficiency than before annealing was formed exclusively in the Ge-B-SiO2 film after annealing at 600 degreesC. The diffraction efficiency of the grating was unchanged upon repeated heating between room temperature and 600 degreesC. (C) 2002 American Institute of Physics.
  • Wataru Watanabe, Kazuhiro Yamada, Daisuke Kuroda, Taishi Shinagawa, Taishi Asano, Junji Nishii, Kazuyoshi Itoh
    Proceedings of SPIE - The International Society for Optical Engineering 4637 1 197 - 203 2002年06月17日 [査読有り][通常論文]
     
    When femtosecond laser pulses are tightly focused inside the bulk of transparent materials, the intensity in a focal volume becomes high enough to produce submicrometer-scale structural modifications. The modifications has been applied to fabricate three-dimensional photonic structures. Tightly-focused femtosecond laser pulses create voids, which are surrounded by densified material. In this paper we show that the shapes of voids can be controlled by the spatial profile of incident laser pulses. We also show that the diffraction intensities due to the fabricated arrays of voids depend on the polarization-states of the readout beam. Finally we demonstrate that irradiation of femtosecond laser pulses moves a void inside calcium fluoride and silica glass without any mechanical translations of the optical system. In situ observation revealed that a void moves towards incident direction of laser pulses as long as 2 micron. © 2002 SPIE - The International Society for Optical Engineering.
  • K. Kintaka, J. Nishii, Y. Kawamoto, A. Sakamoto
    European Conference on Optical Communication, ECOC 3 2002年 
    © 2002 DTU. A Ge-B-SiO2 waveguide with UV-induced Bragg grating is fabricated. A temperature dependence of the Bragg wavelength as low as 4pm/°C, which is 1/3 of a conventional device, is achieved by using multicomponent crystallized glass substrate.
  • Kazuhiro Yamada, Wataru Watanabe, Taishi Asano, Junji Nishii, Kazuyoshi Itoh
    Proceedings of SPIE - The International Society for Optical Engineering 4830 581 - 584 2002年 [査読有り][通常論文]
     
    We have already shown that the refractive-index change is induced by a self-trapped filament of ultrashort laser pulses in silica glass. In this paper, we investigate the dependence of refractive-index change on polarization of incident laser pulses in silica glass. In the experiment, we focused linearly polarized pulses inside a sample of silica glass. We polished the sample and etched by 5% HF solution to observe the cross-sectional view of the regions of refractive-index change that are perpendicular to the filament. The observation with a scanning-electron microscope shows that the cross-section is elliptical and the long axis was parallel to polarization direction of incident laser pulses. The ellipticity was 0.85. We fabricated gratings to estimate the index ellipsoid of the region of refractive-index change. We confirmed that the index ellipsoid was uniaxial and negative. The optic axis was parallel to the axis of the filament and the birefringence was 1×10-3.
  • Wataru Watanabe, Kazuhiro Yamada, Daisuke Kuroda, Taishi Shinagawa, Kazuyoshi Itoh, Junji Nishii
    Proceedings of SPIE - The International Society for Optical Engineering 4830 573 - 575 2002年 [査読有り][通常論文]
     
    When femtosecond laser pulses are tightly focused inside the bulk of transparent materials, the intensity in a focal volume becomes high enough to produce submicrometer-scale structural modifications. This damage was shown to be a cavity or a void surrounded by densified material. An array of voids can be used as optical data storages or gratings. We showed the control experiment of the positions and shapes of voids inside transparent materials with femtosecond laser pulses. We have demonstrated the experiments involving optical movement of a void along the optical axis by translation of the focal spot with femtosecond laser pulses. Irradiation of femtosecond laser pulses moves a void inside calcium fluoride and silica glass without any mechanical translations of the optical system up to 2 micron. In this paper, we show that the shapes of voids can be controlled by the spatial profile of incident laser pulses. Finally we show that the fabrication of a Fresnel lens inside silica glass.
  • Kazuyoshi Itoh, Wataru Watanabe, Yan Li, Kazuhiro Yamada, Junji Nishii
    Proceedings of SPIE - The International Society for Optical Engineering 4803 125 - 139 2002年 [査読有り][通常論文]
     
    We have been studying the refractive index changes and vacancies that are induced in silica glass by the irradiation of ultrashort laser pulses. By scanning the laser beam in the glass we can form 3-D shape of waveguides, arrays of tiny vacancies, called voids, and long holes with microscopic diameters. In this paper, we report on the asymmetry of the waveguide formed by linearly polarized ultrashort pulses. The formation of the photo-induced waveguide is normally accompanied by the filamentation, the self-trapping of laser beam due to nonlinear optical effects. The asymmetric cross-section of the waveguide structures explains properly the illusory birefringence of photo-induced waveguides observed earlier. The cross-sectional forms of the waveguides were observed by polishing and etching the cross-psections. We also report the possibility of forming asymmetric shapes of voids. The asymmetry of voids results from the beam profile. We controlled the profile by inserting apertures before the focusing lens. The asymmetry leads to the polarization dependence of diffraction from the array of voids. We also report on the formation of Bragg grating in glass. The Bragg gratings were formed in soda-lime glass. We succeeded in forming a series of three Bragg gratings. The formation of grating inside glass was confirmed by diffraction experiments and chemical etching of polished cross-sections.
  • K Kintaka, J Nishii
    INTEGRATED OPTICS: DEVICES, MATERIALS, AND TECHNOLOGIES VI 4640 149 - 157 2002年 [査読有り][通常論文]
     
    We have fabricated silica-based waveguide Bragg grating devices and have investigated temperature sensitivity of the Bragg wavelengths. Temperature sensitivity of Bragg wavelength is caused by temperature dependence of effective refractive index and thermal expansion. We examined boron-codoped germanosilicate glasses as waveguide materials in order to decrease a temperature sensitivity of refractive index. The boron-codoped germanosilicate films were fabricated by a plasma enhanced chemical vapor deposition. We adopted Si, silica, and crystallized glass as substrates in order to control the thermal expansion of the waveguides. Bragg grating with 0.53 mum period was formed by irradiation with a KrF excimer laser light through a phase mask. The Bragg wavelength shift of 9.7pm/degreesC was obtained in the B-Ge-SiO2 core waveguide on a silica substrate, while the Bragg wavelength shift was 11pm/degreesC in the with Ge-SiO2 core waveguide on a Si substrate, which was a conventional-type waveguide Bragg grating device. The Bragg wavelength shift was reduced to 7.8pm/degreesC by using B-Ge-SiO2 core and a crystallized glass substrate with zero thermal expansion coefficient, which was 2/3 of the value of the conventional waveguide Bragg grating device.
  • H Nishiyama, Miyamoto, I, K Kintaka, J Nishii
    SECOND INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION 4426 276 - 279 2002年 [査読有り][通常論文]
     
    GeO2-B2O3-SiO2 thin films were fabricated by plasma enhanced chemical vapor deposition method. Boron codoping into a GeO2-SiO2 thin film induced large absorption in the vicinity of 240nm, and OH absorption decreased compared to GeO2-SiO2 films. These films of 5mum in thickness exhibited large positive refractive index change without hydrogen loading by irradiation with ArF (193nm) excimer laser pulses. Induced refractive index change was approximately 0.002 which was measured by prism coupling method. A waveguide was written in this high photosensitive glass film by UV irradiation. The guided mode of the waveguide seems to be single and estimated refractive index change was approximately from 0.003 to 0.004. Three unique phenomena were found in 0.2mum thick films on Si substrate. First, these films exhibited large negative refractive index and positive thickness changes by irradiation with ArF laser pulses. Induced negative index change was larger than 0.01 and thickness change was more than 1%. Silica films doped only boron or germanium didn't exhibit such negative index changes. Second, the annealing before laser irradiation decreased the photosensitivity of these films remarkably. Third, these induced refractive index and thickness changes were decreased with time rapidly. These mechanisms were under investigation.
  • S. Juodkazis, S. Matsuo, H. Misawa, V. Mizeikis, A. Marcinkevicius, H-B. Sun, Y. Tokuda, M. Takahashi, T.Yoko, J. Nishii
    Appl. Surface Science, 197/198 705 - 709 2002年 [査読有り][通常論文]
  • Kazuyoshi Itoh, Wataru Watanabe, Kazuhiro Yamada, Kenn-Ichi Hayashi, Junji Nishii
    Proceedings of SPIE - The International Society for Optical Engineering 4459 118 - 125 2001年 [査読有り][通常論文]
     
    Large-scale integration of compact photonic devices may be the key technology for the future information age. If optical-waveguide structures with small radius of curvatures are integrated inside a small glass tip along with active devices, a paradigm of microphotonics inside glass may become possible. We will review the fabrication techniques for the waveguides and photonic-band structures inside glass with the ultrashort laser pulses and present our recent results of fabrication experiments. The experimental studies include fabrication of birefringent waveguides, formation of small vacancies called voids, and drilling of a narrow but long hole from the rear side of a glass. We will show the birefringence properties of waveguides that are induced by the linearly-polarized ultrashort laser pulses of approximately 100 fs duration. Birefringence of the waveguides depends on the polarization states of the fabrication beam. The experimental studies on the stabilities of a void during the fabrication process are also presented. We will show that the voids move during the fabrication process although the beam and sample are fixed. It will be shown that the void moves from pulse to pulse toward the upstream direction along the optical axis. We can currently drill a long hole of more than 200 microns with a diameter of several microns. We also present the results of numerical analysis of optical propagation through photonic structures that are based on the array of voids.
  • K. Yamada, W. Watanabe, K. Itoh, J. Nishii
    Proceedings of SPIE-The International Society for Optical Engineering 4416 344 - 347 2001年 [査読有り][通常論文]
     
    Refractive-index change is induced by a self-trapped filament of ultrashort laser pulses in a wide variety of glasses. We investigated the dependence of refractive-index change on polarization-state of incident ultrashort laser pulses in silica glass. We fabricated birefringent structures and estimated the refractive-index change.
  • W. Watanabe, K. Yamada, D. Kuroda, T. Shinagawa, K. Itoh, J. Nishii
    Proceedings of SPIE-The International Society for Optical Engineering 4416 340 - 343 2001年 [査読有り][通常論文]
     
    Many researchers have investigated the interaction of femtosecond laser pulses with a wide variety of materials. The structural modifications both on the surface and inside the bulk of transparent materials have been demonstrated. When femtosecond laser pulses are focused into glasses with a high numerical-aperture objective, voids are formed. We report first observation that a bubble, which is called void moves under irradiation of femtosecond laser pulses inside silica glass and calcium fluoride. In situ observation reveals that the void moves towards incident direction of laser pulses as long as 5 micron by successive laser pulses without any mechanical translations.
  • Hisami Nishi, Junji Nishii
    Proceedings of SPIE - The International Society for Optical Engineering 4416 166 - 169 2001年 [査読有り][通常論文]
     
    A novel temperature sensor with high sensitivity using a long-period fiber grating have been proposed, fabricated and evaluated. Temperatures are detected by shifts of resonance wavelength of the transmission spectrum. In the experiment, the temperature sensor was able to measure temperatures from 5°C through 50°C. © 2000 SPIE · 0277-786X/00/$15.00.
  • Kazuhiro Yamada, Wataru Watanabe, Tadamasa Toma, Kazuyoshi Itoh, Junji Nishii
    Optics Letters 26 1 19 - 21 2001年01月01日 [査読有り][通常論文]
     
    We investigated the relationship between the formation of filaments and local refractive-index changes induced by femtosecond laser pulses in silica glass. In situ observation revealed that the location of a filament coincided with that of the refractive-index change. Observation also showed that the region of refractive-index change was elongated toward the upstream direction of the laser pulses with increasing exposure time. The region of refractive-index change was several hundred micrometers long, and its diameter was smaller than 2 μm. The refractive-index change was confirmed by two of three different methods to be as large as 0.8 × 10-2. © 2001 Optical Society of America.
  • Fabrication of 3D Interconnected Network of Microchannels Inside Silica by fs Irradiation and Etching
    A. Marcinkevicius, S. Juodkazis, V. Mizeikis, M. Watanabe, S. Matsuo, J. Nishii, H. Misawa
    Proc. SPIE 4274 469 - 477 2001年 [査読有り][通常論文]
  • A. Marcinkevicius, S. Juodkazis, M. Watanabe, M. Miwa, S. Matso, J. Nishii, H. Misawa
    Opt. Lett. 26 5 277 - 279 2001年 [査読有り][通常論文]
  • H.-B. Sun, Y. Xu, K. Sun, S. Juodkazis, M. Watanabe, S. Matsuo, J. Nishii, H. Misawa
    Opt. Lett. 26 6 325 - 327 2001年 [査読有り][通常論文]
  • V. Mizeikis, H-B. Sun, A. Marcinkevicius, J. Nishii, S. Matsuo, S. Juodkazis, H. Misawa
    J. Photochem. Photobiol. A: Chem. 145 1/2 41 - 47 2001年 [査読有り][通常論文]
  • N Tohge, R Ueno, F Chiba, K Kintaka, J Nishii
    JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 19 1-3 119 - 123 2000年12月 [査読有り][通常論文]
     
    Diffraction gratings of arbitrary periods have been fabricated by the two-beam interference method using photosensitive ZrO2 gel films and characterized. The ZrO2 gel films were formed on Si or silica glass substrates from sols that were derived from Zr-butoxide modified chemically with benzoylacetone. The gel films were irradiated with two interference beams from a He-Cd laser (325 nm) and then leached in ethyl alcohol. The above process gave uniform surface-relief gratings of periods ranging from 1.0 to 0.5 mum, depending on the incidence angle of the interference beams. The diffraction efficiency, measured in the Littrow configuration using a He-Ne laser (633 nm), showed polarization dependence for the grating of 0.5 mum period but not for the gratings of 1.0 mum period. The maximum diffraction efficiency was 18% for the grating of 1.0 mum period and 28% for that of 0.5 mum period in the reflection mode. The present study has proved that the photosensitive gel films are versatile in fabrication of optical devices.
  • Wataru Watanabe, Tadamasa Toma, Kazuhiro Yamada, Junji Nishii, Ken-Ichi Hayashi, Kazuyoshi Itoh
    Optics Letters 25 22 1669 - 1671 2000年11月15日 [査読有り][通常論文]
     
    We demonstrate that one can seize and translate voids formed by IR femtosecond laser pulses inside silica glass and can also cause two voids to merge into one. We also present clear evidence of a void and its surrounding region by showing scanning electron microscope images of cleaved voids, which we produced by cleaving through the glass along a plane that included a thin laser-ablated line on the surface of the glass and the voids formed inside © 2000 Optical Society of America.
  • K Kintaka, J Nishii, N Tohge
    APPLIED OPTICS 39 4 489 - 493 2000年02月 [査読有り][通常論文]
     
    Photosensitive ZrO2 gel films we:re patterned with a two-beam interference method by use of a 325-nm-wavelength He-Cd laser for the first time to our knowledge. The ZrO2 gel films were prepared from Zr(O-n-C4H9)(4) chemically modified with benzoylacetone. We fabricated uniform gratings with a 0.5-mu m period on Si or SiO2 substrates by etching the gel films in ethyl alcohol after UV irradiation. A maximum diffraction efficiency of 28% was attained with the grating fabricated on Si substrate under a Littrow mounting condition by use of a 633-nm-wavelength He-Ne laser. Blazed gratings could also be fabricated. (C) 2000 Optical Society of America.
  • Kenji Kintaka, Junji Nishii
    Conference on Lasers and Electro-Optics Europe - Technical Digest 17  2000年 
    A method for the fabrication of two dimensional periodic structures for photonic crystals is proposed. The two-dimensional periodic structure was formed by photolithography and dry etching with tetrafluorocarbon. The mushroom structures were formed by selective wet etching with 5% hydrogen fluoride solution.
  • Kazuhiro Yamada, Tadamasa Toma, Wataru Watanabe, Junji Nishii, Kazuyoshi Itoh
    Proceedings of SPIE - The International Society for Optical Engineering 4088 367 - 370 2000年 [査読有り][通常論文]
     
    Recently, the structural modifications of glass by focusing femtosecond laser pulses have been demonstrated. We present photo-induced structural changes in silica glass with femtosecond laser pulses. We investigated the relationship between the formation of filaments and local refractive index changes in silica glass. In situ observation revealed the coincidence between the location of filament and that of refractive index change. The observation also showed that the region of refractive index change elongates toward the upstream direction of laser pulses with the exposure time. The region of refractive index change was several hundred-micron long and the diameter was smaller than two microns. The length of the region was dependent on the numerical aperture of focusing lenses. The refractive index change was confirmed to be as large as 0.01 by three different methods. We fabricated a 2-mm waveguide by translating the sample along the optical axis.
  • Wataru Watanabe, Tadamasa Toma, Kazuhiro Yamada, Junji Nishii, K. I. Hayashi, Kazuyoshi Itoh
    Proceedings of SPIE - The International Society for Optical Engineering 4088 44 - 47 2000年 [査読有り][通常論文]
     
    Many researchers have investigated the interaction of femtosecond laser pulses with a wide variety of materials. The structural modifications both on the surface and inside the bulk of transparent materials have been demonstrated. When femtosecond laser pulses are focused into glasses with a high numerical-aperture objective, voids are formed. We demonstrate that one can seize and move voids formed by femtosecond laser pulses inside silica glass and also merge two voids into one. We also present clear evidence that a void is a cavity by showing a scanning-electron-microscope image of cleft voids: we clove through the glass along a plane that includes the laser-ablated thin line on the surface and the voids formed inside. The optical seizing and merging of voids are important basic techniques for fabricate micro-optical dynamic devices, such as the rewritable 3-D optical storage.
  • Tadamasa Toma, Yoshio Furuya, Wataru Watanabe, Kazuyoshi Itoh, Junji Nishii, Ken-Ichi Hayashi
    Optical Review 7 1 14 - 17 2000年 [査読有り][通常論文]
     
    It is known that local refractive index change occurs when femtosecond laser pulses with extremely high peak power are launched into glass. We focused 130-femtosecond laser pulses of 800 nm into the bulk of glass and examined the shape of the induced refractive index change. We found that the length of the spot of the refractive index change along the optical axis reached about 30 μm despite the diameter being about 2 μm. To estimate the distribution of induced refractive index change, we fabricated Bragg grating by scanning the focused spot and calculated the amount of the change by applying Kogelnik's coupled mode theory to the measured diffraction efficiencies of the higher order diffracted beams.
  • MIZOGUCHI H, KITAMURA N, FUKUMI K, MIHARA T, NISHII J, NAKAMURA M, KIKUCHI N, HOSONO H, KAWAZOE H
    J. Appl. Phys. 87 9,Pt.1 4617 - 4619 2000年 [査読無し][通常論文]
  • K Kintaka, J Nishii, N Tohge
    SOL-GEL OPTICS V 3943 38 - 46 2000年 [査読有り][通常論文]
     
    Photosensitive gel films were patterned with a two-beam interference method by use of 325-nm-wavelength He-Cd laser. We fabricated two-dimensional periodic structures on photosensitive ZrO2 gel films.-The ZrO2 gel films were prepared from Zr(O-n-C4H9)(4) chemically modified by benzoylacetone. For fabrication of two-dimensional pattern, UV-irradiation process was divided into two parts and the substrate was rotated by 90 degrees between the parts. When total irradiation time was equal to the time for grating fabrication (10min), two-dimensional dotted pattern was obtained. A checked pattern was also obtained with irradiation time of 30min. We also fabricated surface-relief gratings on photosensitive Pb(Zr, Ti)O-3 (PZT) gel films. The PZT gel films were formed by dip coating with sol solution, which was prepared from Zr(O-n-C4H9)(4) chemically modified with benzoylacetone, Ti(O-n-C4H9)(4) chemically modified with benzoylacetone, Pb(CH3COO)(2), and alcohol. The gel films could be crystallized by annealing at 700 degrees C for 1h. The annealed films had a ferroelectric phase and a P-E hysteresis loop was obtained. Uniform gratings with a sub-micrometer period were formed on the gel films by two-UV-beams irradiation and etching with butanol. A maximum first-order diffraction efficiency of 28% was obtained under a Littrow mounting condition by use of a linear-polarized 633-nm-wavelength light.
  • Photonic Lattices Achieved with High Power Femtosecond Laser Microexplosion in Transparent Solid Materials
    H.-B. Sun, Y. Xu, S. Juodkazis, K. Sun, J. Nishii, Y. Suzuki, S. Matsuo, H. Misawa
    Proc. SPIE 3888 131 - 142 2000年 [査読有り][通常論文]
  • Inlayed “Atom”-like Three-dimensional Photonic Crystal Structures Created with Femtosecond Laser Microfabrication
    H.-B. Sun, Y. Xu, K. Sun, S. Juodkazis, J. Nishii, Y. Suzuki, S. Matsuo, H. Misawa
    Mat. Res. Soc. Symp. Proc. 605 85 - 90 2000年 [査読有り][通常論文]
  • H. Misawa, S. Juodkazis, H.-B. Sun, S. Matsuo, J. Nishii
    Proc. SPIE 4088 29 - 32 2000年 [査読有り][通常論文]
  • S. Juodkazis, M. Watanabe, H.-B. Sun, S. Matsuo, J. Nishii, H. Misawa
    Applied Surface Science 154/155 696 - 700 2000年 [査読有り][通常論文]
  • H.-B. Sun, S. Juodkazis, M. Watanabe, S. Matsuo, H. Misawa, J. Nishii
    J. Phys. Chem. B 104 15 3450 - 3455 2000年 [査読有り][通常論文]
  • M. Watanabe, S. Juodkazis, S. Matsuo, J. Nishii, H. Misawa
    Jpn. J. Appl. Phys. 39 12A 6763 - 6767 2000年 [査読有り][通常論文]
  • M Takahashi, H Shigemura, Y Kawamoto, J Nishii, T Yoko
    JOURNAL OF NON-CRYSTALLINE SOLIDS 259 149 - 155 1999年11月 [査読有り][通常論文]
     
    Germanosilicate glasses (10GeO(2)-90SiO(2)) were prepared by a sol-gel method and the ultraviolet-photosensitivity of glasses was investigated by optical absorption, electron spin resonance, and photoluminescence measurements. A one order larger intensity in the 5-eV absorption band was observed in the sol-gel glass sintered under an atmosphere at pressure <10(-2) Torr, compared to a fiber preform of the same composition formed by a vapor phase axial deposition method. Changes in optical absorption were observed in the sol-gel derived glass by ultraviolet laser irradiation; a decrease in 5-eV band and increases in absorption around 4.5 and >5.7 eV were also noted. Photoluminescence intensity under 248-nm excitation decreased with an increase in laser fluence and with a corresponding decrease in the 5-eV band. This result implies that an ultraviolet-induced photochemical reaction from Ge2+ to Ge EE in the glass had occurred. (C) 1999 Elsevier Science B.V. All rights reserved.
  • N Kitamura, K Fukumi, J Nishii, M Makihara, T Sasaki, N Ohno
    JOURNAL OF NON-CRYSTALLINE SOLIDS 259 68 - 72 1999年11月 [査読有り][通常論文]
     
    High pressure effects on optical properties of Ce3+ doped ternary fluoroaluminate (18BaF(2). 37CaF(2). 45AlF(3)) glass have been investigated in terms of ligand field around cerium ion. Five bands due to the 4f-5d transitions were observed in ultraviolet absorption spectra for the glass. A photoluminescence band was observed at around 300 nm under excitation at each band, The photoluminescence band shifted toward smaller energies by densifying the glass using high pressures and temperatures. An energy shift of the band was also found in in situ photoluminescence measurement under high pressure using a sapphire anvil cell. However, the shift observed under high pressure was large compared with that of the densified glass. We deduced that the large peak shift under high pressure is mainly due to a local elastic contraction around cerium ion. (C) 1999 Elsevier Science B.V. All rights reserved.
  • Byeong Ha Lee, Junji Nishii
    Applied Optics 38 16 3450 - 3459 1999年06月01日 [査読有り][通常論文]
     
    The spectral spacing of the interference fringes formed by a pair of long-period fiber gratings was investigated. The variation of the fringe spacing was measured while the separation between the gratings was changed from 22 to 500 mm. When the grating separation was much longer than the length of the individual grating, the inverse of the fringe spacing became linearly proportional to the grating separation and to the differential effective group index of the fiber. In the third stop band of the grating pair, made along a dispersion-shifted fiber centered at 1.55 μm, the differential effective group index was calculated to be ˜6.4 × 10–3, which is approximately twice the differential effective index of the fiber. The discrepancy between the two indices was observed to decrease with the band order, a phenomenon that is explained by the first-order dispersion of the fiber. The measured interference fringes were not regularly spaced in the frequency domain, but regular spacing is required in wavelengthdivision multiplexing communication systems. Analysis of the second-order dispersion of the fiber and the grating-induced nonlinear phase shift within grating regions as the factors that induce chirping on the fringe spacing is presented. © 1999 Optical Society of America.
  • H Shigemura, Y Kawamoto, J Nishii, M Takahashi
    JOURNAL OF APPLIED PHYSICS 85 7 3413 - 3418 1999年04月 [査読有り][通常論文]
     
    Germanosilicate glasses are prepared by a sol-gel method and the ultraviolet (UV) photosensitivity of the glasses is investigated by optical absorption, electron spin resonance, and photoluminescence measurements. A KrF pulsed laser and a Hg lamp are used as UV light sources. The concentrations of intrinsic germanium-related oxygen-deficient centers in the glasses are successfully controlled by sintering conditions; in air or under reduced pressure. One-order larger intensity of the 5 eV absorption band is observed in the sol-gel glass sintered under the latter condition, as compared to a fiber preform of almost the same composition, which is formed by the vapor-phase axial deposition method. The effect of irradiation with KrF laser pulses on sol-gel glass is different from that on preform glass. On the other hand, the Hg-lamp illumination has the same effect on both sol-gel glass and preform glass. Based on these results, we discuss the defect states in sol-gel-derived glass and fiber preform glass and also the mechanisms of photochemical reactions under these two UV light sources. (C) 1999 American Institute of Physics. [S0021-8979(99)06007-7].
  • Junji Nishii, Kenji Kintaka
    Physical Review B - Condensed Matter and Materials Physics 60 10 7166 - 7169 1999年 [査読有り][通常論文]
     
    Formation processes of paramagnetic centers in (Formula presented) glasses by irradiation with KrF excimer-laser pulses (5 eV) were investigated at 77 K using electron-spin resonance (ESR). The essential photochemical reaction was the pair generation of electron-trapped centers associated with fourfold coordinated Ge ion (GEC) and self-trapped hole centers of bridging oxygen (STH). This reaction proceeds by band-to-band excitation via two-photon absorption process. A part of GEC was converted to (Formula presented) center during prolonged irradiation at 77 K. The difference between ESR spectra before and after annealing at room temperature revealed that the majority of STH disappears by recombination with GEC (or (Formula presented) during annealing at room temperature. The dominant paramagnetic centers remaining after annealing were GEC and (Formula presented) and their total concentration was approximately 50% of those before annealing. The intimate relation between the generation of paramagnetic centers and the decay of emission due to (Formula presented) suggested that the hole transfer from STH to (Formula presented) is followed by their structural relaxation. © 1999 The American Physical Society.
  • M Saito, K Kikuchi, C Tanaka, H Sone, S Morimoto, T Yamashita, J Nishii
    IMAGING SPECTROMETRY V 3753 475 - 483 1999年 [査読有り][通常論文]
     
    A coherent fiber bundle for infrared image transmission was prepared by arranging 8400 chalcogenide (AsS) glass fibers. The fiber bundle, 1 m in length, is transmissive in the infrared spectral region of 1-6 mu m. A remote spectroscopic imaging system was constructed with the fiber bundle and an infrared PtSi CCD camera. The system was used for the real-time observation (frame time: 1/60 s) of gas distribution. Infrared light from a SiC heater was delivered to a gas cell through a chalcogenide fiber, and transmitted light was observed through the fiber bundle. A band-pass filter was used for the selection of gas species. A He-Ne laser of 3.4 mu m wavelength was also used for the observation of hydrocarbon gases. Gases bursting from a nozzle were observed. successfully by a remote imaging system.
  • M. Saito, K. Kikuchi, C. Tanaka, H. Sone, S. Morimoto, T. Yamashita, J. Nishii
    Rev. Sci. Instrum. 70 11 4308 - 4312 1999年 [査読有り][通常論文]
  • B. H. Lee, J. Nishii
    Electronics Letters 34 21 2059 - 2060 1998年10月15日 [査読有り][通常論文]
     
    The authors describe self-interference fringes created in a single long-period fibre grating (LPG) formed in a double-cladding fibre, one end of which is coated with a metal film. The temperature-induced fringe-shift in the reflection spectrum of the proposed LPG device was measured to be 0.055nm/°C with 0.9°C RMS deviation. Applications of such devices as filters and fine temperature sensors are expected.
  • Byeong Ha Lee, J. Nishii
    Electronics Letters 34 19 1872 - 1873 1998年09月17日 [査読有り][通常論文]
     
    A series of notch filters formed with cascaded multiple long-period gratings are discussed and experimental results presented. The free spectral range and the finesse of the filter can be tailored by adjusting the distance between gratings and the total number of gratings.
  • B. H. Lee, J. Nishii
    Electronics Letters 34 11 1129 - 1130 1998年05月28日 [査読有り][通常論文]
     
    A long period grating is presented, the resonant peak of which is not sensitive to the interface between the cladding and the surrounding media of a fibre. The spectral behaviour of the resonant peak is investigated using index matching oils and mechanical scratching on the cladding surface of the fibre.
  • Qiu, JR, K Miura, H Inouye, J Nishii, K Hirao
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 141 1-4 699 - 703 1998年05月 [査読有り][通常論文]
     
    We report on three-dimensional optical data storage inside a silica glass by using a focused 800 nm, 120 fs, 200 kHz pulsed laser. The glass is transparent in the wavelengths ranging from 250 to 1000 nm, After the irradiation of the 800 nm tightly focused femtosecond laser, a refractive-index bit was formed in the glass. The relations between the size of refractive-index bit versus average power and irradiation duration of the laser;pulse have been examined. Absorption and ESR spectra showed a significant increase in the concentration of SiE' color centers in the laser irradiated glass. A multi-photon absorption process is considered to have occurred in the glasses when irradiated by the laser pulses, We suggest that writing three-dimensional refractive-index bit inside the transparent glasses based on a multi-photon absorption process will become a promising method to fabricate optical memory with both an ultrahigh storage density and an ultrahigh recording speed. (C) 1998 Elsevier Science B.V. All rights reserved.
  • Zhao Gaoyang, Tohge Noboru, Nishii Junji
    Japanese journal of applied physics. Pt. 1, Regular papers & short notes 37 4 1842 - 1846 社団法人応用物理学会 1998年04月15日 
    A new process for the fabrication of diffraction gratings has been proposed using photosensitive Al2O3 gel films in combination with a phase mask. Photosensitive Al2O3 gel films were derived from Al(O-sec-Bu)3 chemically modified with benzoylacetone. These gel films exhibited an optical absorption band in the UV-range, which is associated with the π–π* transition of chelate rings of the β-diketonate ligand. The irradiation of these gel films with XeF and KrF excimer lasers decreased their solubility in acetone containing 1.2 vol%HNO3, simultaneously with the dissociation of the remaining chelate rings. The above findings were applied to the fabrication of Al2O3 film diffraction gratings on Si and silica substrates; the gel films were irradiated with the excimer lasers through a phase mask, leached, and then heat-treated. The diffraction efficiency of the fabricated gratings was evaluated in reflection (Si sub.) and transmission (silica sub.) modes with respect to the preparation conditions.
  • Kohei Fukumi, Akiyoshi Chayahara, Naoyuki Kitamura, Junji Nishii, Yuji Horino, Masaki Makihara, Kanenaga Fujii, Junji Hayakawa
    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms 141 1-4 620 - 624 1998年 [査読有り][通常論文]
     
    Thermal relaxation of Si-O-Si bond angle has been studied in 1 MeV B+-ion, 1 MeV O+-ion and 4 MeV Ni2+-ion implanted silica glasses by infrared reflection and visible and near-infrared reflection spectroscopy. It is found that the change in Si-O-Si bond angle is not proportional to the change in molar volume upon annealing. It is deduced that the relaxation mechanism of Si-O-Si bond angle accompanied by little density change has an activation energy of about 100 kJ mol-1. © 1998 Elsevier Science B.V. All rights reserved.
  • M. Watanabe, H.-B. Sun, S. Juodkazis, T. Takahashi, S. Matsuo, Y. Suzuki, J. Nishii, H. Misawa
    Jpn. J. Appl. Phys. 37 12B L1527 - L1530 社団法人応用物理学会 1998年 [査読有り][通常論文]
     
    To achieve high bit densities (>10 GB/cm3) in optical memory, we accomplished a three-dimensional optical data storage system using vitreous silica as the recording material. We succeeded in high-density optical recording by focusing pulsed laser beams of 532 nm (full width at half maximum [FWHM] 30 ps) and 400 nm (150 fs). A recording density of 72.9 GB/cm3 was achieved, which corresponded to that of 100 compact disks, on a glass plate of (2×2) cm2 and 2.2 mm thickness. We found that the optical damage of silica occurs within 400 ps after irradiation by a single pulse for 30 ps at 532 nm. Three photoluminescence bands were found in the photomodified silica at 283 nm, 468 nm and 558 nm. All the three bands showed similar photoluminescence excitation spectra, i.e. a peak related to oxygen vacancy absorption at 250 nm.
  • Junji Nishii, Hiroshi Yamanaka
    Applied Optics 36 27 6852 - 6856 1997年09月20日 [査読有り][通常論文]
     
    Photon-induced property changes of sputter-deposited GeO2-SiO2 thin glass films were investigated. Irradiation with ArF laser pulses induced the changes in refractive index of −10% and volume of +30% in the film without ablation. A Bragg grating with a positive sinusoid wave pattern was printed upon the film by irradiation with ArF excimer laser pulses through a phase mask. The irradiated area could be quickly etched by a HF solution. The ratio of etching rate of irradiated area to unirradiated area was higher than 30. A Bragg grating with a surface relief pattern was successfully formed on the film by irradiation with excimer laser pulses followed by chemical etching. Diffraction efficiency of the gratings increased by 25 times with the etching. © 1997 Optical Society of America.
  • J Nishii, H Yamanaka, H Hosono, H Kawazoe
    OPTICS LETTERS 21 17 1360 - 1362 1996年09月 [査読有り][通常論文]
     
    GeO2-SiO2 thin glass films were prepared by the rf sputtering deposition method. Changes in the refractive index of -3% and in the volume of +18% were induced in the film by irradiation with excimer-laser pulses. Bragg gratings a (periodic surface-relief pattern with a sinusoidal wave) have been written in the film by irradiation through a phase mask.
  • J Nishii, A Chayahara, K Fukumi, K Fujii, H Yamanaka, H Hosono, H Kawazoe
    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 116 1-4 150 - 153 1996年08月 [査読有り][通常論文]
     
    Photochemical reactions induced by ultraviolet (UV) excimer lasers were investigated for a 10GeO(2)-90SiO(2) (mol%) glass fiber preform and a SiO2 glass implanted with Ge+ ions (1 x 10(16) cm(-2)) by the electron spin resonance (ESR) and the optical absorption. Electron trapped centers associated with fourfold coordinated Ge ion (GEC) were formed in the former by irradiation with KrF laser (5 eV) or ArF (6.3 eV) laser pulses. The concentration of GECs increased as the square of the laser power, which means that the formation reaction of GEC proceeds via a two-photon absorption process. Si E' centers (. Si=O-3, full width at half maximum (FWHM) = 3 G) and peroxy radicals (PORs: Si-O-O . or O-2(-)) were formed in the SiO2 glass implanted with Ge ions, which could be bleached by UV irradiation or prolonged isochronal annealing. The exposure of the annealed glass to excimer laser pulses induced Si E' centers having identical FWHM with that observed in the as-implanted glass. No W-induced ESR signal related with Ge ion was confirmed before or after annealing. The intense UV absorption bands were induced both in fiber preform and implanted glasses, which should cause the positive index change.
  • Hideo Hosono, Hiroshi Kawazoe, Junji Nishii
    Physical Review B - Condensed Matter and Materials Physics 53 18 R11921 - R11923 1996年 [査読有り][通常論文]
     
    The formation of germanium electron centers in (Formula presented)[Ge(Formula presented)] glasses by irradiation with excimer laser light was found to occur via two-photon absorption processes for ArF, KrF, and XeCl lasers. Although the wavelength of KrF laser light corresponds to the absorption band of preexisting oxygen-deficient defects associated with Ge ions, no significant difference in the formation efficiency was seen between ArF and KrF laser lights. The efficiency for XeCl laser light was smaller by four orders of magnitude than that for ArF or KrF light, but was still larger by an order of magnitude than the formation efficiency of Si (Formula presented) centers in Si(Formula presented) glasses with ArF laser light. It was shown that defect-formation efficiencies for the case where the two-photon energy is close to the optical band gap are much lower than for that when the two-photon energy is enough to exceed the band gap. © 1996 The American Physical Society.
  • K Fukumi, A Chayahara, N Kitamura, J Nishii, K Kadono, M Makihara, K Fujii, J Hayakawa
    JOURNAL OF APPLIED PHYSICS 79 2 1060 - 1064 1996年01月 [査読有り][通常論文]
     
    Al+ ions have been implanted in silica glass at an acceleration energy of 200 eV and doses ranging from 1 x 10(13) to 1 x 10(17) ions cm(-2). Infrared reflection spectra and ultraviolet, visible, and near-infrared absorption spectra have been measured. It was found that refractive index of silica glass increased by 6%-10% after implantation of 1 x 10(17) Al+ ions cm(-2). It was deduced that this refractive index change is caused by the formation of Si-Si homobonds, but not by the decrease in Si-O-Si bond angle which leads to compaction. (C) 1996 American Institute of Physics.
  • Junji Nishii, Hiroshi Yamanaka, Hideo Hosono, Hiroshi Kawazoe
    Radiation Effects and Defects in Solids 136 1-4 133 - 136 1995年 [査読有り][通常論文]
     
    The absorption band peaking at 5.17 eV, which is due to neutral oxygen deficient vacancy, in rf-sputter deposited GeO2-SiO2 thin glass films was bleached by ultraviolet-illumination, and an intense absorption band was induced around 6.4 eV. The refractive index change calculated via Kramers-Kronig relations was of the order of 10-4, which was higher by one order of magnitude than those of bulk germanosilicate glasses prepared by VAD method. The concentration of Ge E’ centers increased with the intensity of the 6.4 eV band. The oscillator strength of the 6.4 eV band, however, exceeded unity on the assumption that Ge E’ centers exclusively induce this band. It was, therefore, concluded that not only Ge E’ center but also other photochemically induced color centers give the 6.4 eV band, which is the origin of large refractive index change. © 1995, Taylor & Francis Group, LLC. All rights reserved.
  • J NISHII, S MORIMOTO, INAGAWA, I, R IIZUKA, T YAMASHITA, T YAMAGISHI
    JOURNAL OF NON-CRYSTALLINE SOLIDS 140 1-3 199 - 208 1992年01月 [査読有り][通常論文]
     
    Sulfide, selenide and telluride glass fibers were prepared for infrared optical applications. A new crucible drawing method was developed for the drawing of fibers with glass cladding. The extrinsic losses caused by some oxide impurities were suppressed by the purification of raw elements. The transmission loss and mechanical strength, i.e., bending and tensile, of each fiber were investigated before and after the heat treatment under humid conditions. The fibers obtained were used for the power delivery of CO2 laser (10.6-mu-m) and CO laser (5.4-mu-m). The antireflection coating onto fiber ends and cooling of fiber with gas or water were examined for the improvement of power transmission efficiency. A fiber cable having ZnSe lens at the output end was prepared for medical and other applications. Temperature monitoring, thermal imaging and gas sensing were also tried using the fibers.
  • J NISHII, T YAMASHITA, T YAMAGISHI, C TANAKA, H SONE
    APPLIED PHYSICS LETTERS 59 21 2639 - 2641 1991年11月 [査読有り][通常論文]
     
    Coherent infrared (IR) image bundle was developed for the delivery of the IR thermal image. The fiber employed was the As2S3 glass core of 65-mu-m diam and Teflon (perfluoronated ethylene propylene) cladding of 75-mu-m diam, which has the transmission range in the wavelength region between 1 and 7-mu-m. Two kinds of bundles of 100 cm long were prepared, which consisted of 1550 fibers (NPB75-1550) and of 8400 fibers (NPB75-8400). The IR imaging system was constructed by coupling the bundle to an IR television camera. The performance of the system was investigated by detecting the thermal image of an operating LSI package.
  • J NISHII, T YAMASHITA, T YAMAGISHI
    JOURNAL OF MATERIALS SCIENCE 24 12 4293 - 4297 1989年12月 [査読有り][通常論文]
  • J NISHII, T YAMASHITA, T YAMAGISHI
    APPLIED OPTICS 28 23 5122 - 5127 1989年12月 [査読有り][通常論文]
  • Junji Nishii, Toshiharu Yamashita, Takashi Yamagishi
    Applied Optics 28 23 5122 - 5127 1989年 [査読有り][通常論文]
     
    GeAsSeTe, GeSeTeTl, and GeSeTe glass fibers with a core-cladding structure were prepared by one of two methods: crucible drawing or preform drawing. The diameter of the core was 340 Mm and that of the cladding was 440 μm. The transmission loss spectra of the fibers were measured by the cut-back method. The crucible drawing method was preferable to reduce the loss due to structural imperfections at the interface of the core and cladding. The lowest loss of 1.7 dB/m was achieved at 10.6 μm (the wavelength of the CO2 laser) in the fibers with a GeSeTe core and a GeAsSeTe cladding. Transmission of CO2 laser power was examined using a 1.5-m long fiber and an output power of 2 W (2.2 kW/cm2 in power density) was obtained. © 1989, Optical Society of America.
  • J NISHII, T YAMASHITA, T YAMAGISHI
    APPLIED PHYSICS LETTERS 53 7 553 - 554 1988年08月 [査読有り][通常論文]
  • H HOSONO, H KAWAZOE, J NISHII, T KANAZAWA
    JOURNAL OF NON-CRYSTALLINE SOLIDS 51 2 217 - 240 1982年 [査読有り][通常論文]
  • 微細周期構造による回折現象を利用した光導波路デバイス
    中澤 達洋, 大家 和晃, 西山 宏昭, 西井 準治
    応用物理 73 11 1418 - 1422 [査読有り][通常論文]

書籍

講演・口頭発表等

  • ケイリン酸塩ガラスのイオン伝導特性  [通常講演]
    山田 裕也, 岩﨑 秀, Khurelbaataar, Zagarzusem, メルバート ジェーム, 小野 円佳, 藤岡 正弥, 小俣 孝久, 西井 準治
    第62回ガラスおよびフォトニクス材料討論会 2021年11月 ポスター発表
  • Observation and theoretical calculation of spin transport in Ni78Fe22/molecules/Ni78Fe22 nanojunction devices  [通常講演]
    K. Hayashi, Y. Sasaki, K. Senshu, T. Misawa, J. Nishii, H. Kaiju
    The 34th International Microprocesses and Nanotechnology Conference (MNC 2021) 2021年10月 ポスター発表
  • 高圧固体電気化学法の開発と新規物質合成  [通常講演]
    藤岡 正弥, 岩﨑 秀, 星野 海大, メルバート ジェーム, 小野 円佳, 西井 準治
    第62回高圧討論会 2021年10月 口頭発表(一般)
  • 共有結合性材料NaAlB14におけるNaイオンの拡散制御  [通常講演]
    星野 海大, 岩﨑 秀, 森戸 春彦, 桂 ゆかり, 熊谷 将也, メルバート ジェーム, 小野 円佳, 藤岡 正弥, 西井 準治
    第62回高圧討論会 2021年10月 口頭発表(一般)
  • 多結晶NaAlB14の単相化と電子物性  [通常講演]
    星野 海大, 岩﨑 秀, 森戸 春彦, 熊谷 将也, 桂 ゆかり, メルバート ジェーム, 小野 円佳, 藤岡 正弥, 西井 準治
    日本金属学会 2021年秋期(第169回)講演大会 2021年09月 口頭発表(一般)
  • 高温高圧処理を施したシリカガラスの高エネルギーX線を用いた構造解析  [通常講演]
    田邊 泰人, ザガルツェム フレルバータル, メルバート ジェーム, 藤岡 正弥, 小原 真司, 小野 円佳, 西井 準治
    第82回応用物理学会秋季学術講演会 2021年09月 口頭発表(一般)
  • 高温高圧処理したシリカガラスの高エネルギーX線を用いた構造解析  [通常講演]
    田邊 泰人, フレルバータル ザガルツェム, メルバート ジェーム, 藤岡 正弥, 赤塚 公章, 小原 真司, 小野 円佳, 西井 準治
    日本セラミックス協会 第34回秋季シンポジウム 2021年09月 口頭発表(一般)
  • 共有結合性骨格を有するNaAlB14の電子伝導特性  [通常講演]
    星野 海大, 岩﨑 秀, 森戸 春彦, 藤岡 正弥, 西井 準治
    日本材料科学会 2021年度学術講演大会 2021年05月 口頭発表(一般)
  • 高圧固体電気化学法によるNaAlB14の電子物性制御  [通常講演]
    星野 海大, 岩﨑 秀, フレルバータル, ザガルツェム, メルバート ジェーム, 小野 円佳, 藤岡 正弥, 西井 準治
    第56回 応用物理学会北海道支部/第17回 日本光学会北海道支部合同学術講演会 2021年01月 口頭発表(一般)
  • NaClカプセルの水素封止能力の圧力・温度依存性  [通常講演]
    山田 裕也, 岩﨑 秀, フレルバータル, ザガルツェム, メルバート ジェーム, 小野 円佳, 藤岡 正弥, 西井 準治
    第56回応用物理学会北海道支部/第17回日本光学会北海道支部合同学術講演会 2021年01月 口頭発表(一般)
  • Ni78Fe22/Mq3(M = Al, Er)/Ni78Fe22ナノ接合素子における室温磁気抵抗効果  [通常講演]
    千秋 賀英子, 佐々木 悠馬, 中山 雄介, 三澤 貴浩, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 西井 準治, 海住 英生
    第44回日本磁気学会学術講演会 2020年12月 口頭発表(一般)
  • Deintercalation of Na+ from NaAlB14 by a high-pressure electrochemical method  [通常講演]
    S. Iwasaki, H. Morito, M. Jeem, M. Ono, M. Fujioka, J. Nishii
    The 21st RIES-HOKUDAI international symposium 2020年12月 ポスター発表
  • Synthesis and electrical conductivity of Ag-intercalated transition-metal compound AgxZrTe3  [通常講演]
    K. Sato, M. Fujioka,M. Jeem, M. Ono, J. Nishii
    The 21st RIES-HOKUDAI international symposium 2020年12月 ポスター発表
  • NaClカプセルの水素封止能力の検証および水素化物の高圧合成  [通常講演]
    山田 裕也, 岩﨑 秀, フレルバータル, ザガルツェム, メルバート ジェーム, 小野 円佳, 藤岡 正弥, 西井 準治
    令和2年度 日本セラミックス協会 東北北海道支部 研究発表会 2020年11月 ポスター発表
  • 遷移金属トリカルコゲナイド層間化合物AgxZrTe3の合成およびその電気伝導特性  [通常講演]
    佐藤 賢斗, 岩﨑 秀, フレルバータル, ザガルツェム, メルバート ジェーム, 小野 円佳, 藤岡 正弥, 西井 準治
    令和2年度 日本セラミックス協会 東北北海道支部 研究発表会 ポスター発表
  • 多価数イオン伝導体の合成と高圧固体電気化学への応用  [通常講演]
    星野 海大, 岩﨑 秀, 田邊 泰人, 佐藤 賢斗, 小野 円佳, 藤岡 正弥, 西井 準治
    令和2年度 日本セラミックス協会 東北北海道支部 研究発表会 ポスター発表
  • Spin transport properties in Ni78Fe22/Mq3 (M=Al, Er)/Ni78Fe22 nanoscale junction devices utilizing magnetic thin-film edges  [通常講演]
    K. Senshu, Y. Sasaki, Y. Nakayama, T. Misawa, T. Komine, N. Hoshino,T, Akutagawa, M. Fujioka, J. Nishii, H. Kaiju
    33rd International Microprocesses and Nanotechnology Conference (MNC 2020) 口頭発表(一般)
  • 高圧固体電気化学法の開発  [通常講演]
    藤岡 正弥, 岩﨑 秀, フレルバータル, ザガルツェム, 小峰 啓史, 森戸 春彦, メルバート ジェーム, 小野 円佳, 西井 準治
    2020年秋期日本金属学会 第167回講演大会 2020年09月 口頭発表(一般)
  • イオンの拡散制御による新規物質開発  [招待講演]
    藤岡 正弥, 岩﨑 秀, フレルバータル, ザガルツェム, 小峰 啓史, 森戸 春彦, メルバート ジェーム, 小野 円佳, 西井 準治
    第81回応用物理学会秋季学術講演会 2020年09月 口頭発表(招待・特別)
  • 磁性薄膜エッジを利用したNi78Fe22/Mq3(M = Al, Er)/Ni78Fe22ナノ接合素子の電気磁気特性  [通常講演]
    千秋 賀英子, 佐々木 悠馬, 中山 雄介, 三澤 貴浩, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 西井 準治, 海住 英生
    日本物理学会2020年秋季大会 ポスター発表
  • シリカガラスの更なる低光損失化に向けた高温高圧合成条件の探索  [通常講演]
    田邊 泰人, Khurelbaatar, Zagarzuem, メルバート ジェーム, 藤岡 正弥, 小野 円佳, 西井 準治
    セラミックス協会年会 2020年 口頭発表(一般)
  • Solid state electrochemistry for intercalation by using proton-driven ion introduction  [招待講演]
    藤岡 正弥, 佐藤 賢斗, 長尾 雅則, 出村 郷志, Sakata Hideaki, 足立 伸太郎, 高野 義彦, 海住 英生, メルバート ジェーム, 西井 準治
    Materials Research Meeting 2019 口頭発表(招待・特別)
  • Junction Area and Bias Voltage Dependence of MR Ratio in Ni78Fe22/Mq3(M=Al, Er)/Ni78Fe22 Nanoscale Junction Devices Utilizing Magnetic Thin-film Edges  [通常講演]
    Y. Sasaki, R. Msiska,T. Misawa, S. Mori, T. Komine, N. Hoshino,T, Akutagawa, M. Fujioka, M. Jeem, M. Ono, J. Nishii, H. Kaiju
    2019 International Symposium of Research Institute for Electronic Science (RIES), Hokkaido University &Center for Emergent Functional Matter Science (CEFMS)National Chiao Tung University 2019年12月 ポスター発表
  • Thermal Stability of Proton Conductive Phosphate Glasses Containing Rare Earth Elements  [通常講演]
    T. Fang, T. Tatebayashi, M. Fujioka, H. Kaiju, Y. Ren, G. Zhao, M. Jeem, M. Ono, J. Nishii
    2019 International Symposium of Research Institute for Electronic Science (RIES), Hokkaido University &Center for Emergent Functional Matter Science (CEFMS)National Chiao Tung University 2019年12月 ポスター発表
  • Controlling of Electrical Characteristics of Schottky Diode by Graphene Interlayer  [通常講演]
    Z. Khurelbaataar, S. Tsagaanchuluun, M. Fujioka, M. Jeem, M. Ono, J. Nishii
    The 20th RIES-HOKUDAI International Symposium 2019年12月 ポスター発表
  • Effect of GeO2 additive on the properties of phosphate proton conductors prepared by alkali-proton substitution approach  [通常講演]
    Y. Ren, M. Fujioka, M. Jeem, T. Kinoshita, T. Fang, Y. Tanabe, G. Zhao, J. Nishii
    The 20th RIES-HOKUDAI International Symposium 2019年12月 ポスター発表
  • 電気的イオン拡散による新規物質開発  [招待講演]
    藤岡 正弥, 西井 準治
    日本セラミックス協会東北北海道支部 第27 回北海道地区セミナー2019 2019年11月 口頭発表(招待・特別)
  • 希土類元素を含有するプロトン伝導リン酸塩ガラスの熱的安定性  [通常講演]
    Fang Tong, Ren Yang, メルバート ジェーム, 藤岡 正弥, 小野 円佳, 西井 準治
    令和元年度 日本セラミックス協会 東北北海道支部研究発表会 2019年11月 ポスター発表
  • シリカガラスの高圧合成による構造変化  [通常講演]
    田邊 泰人, 小野 円佳, 西井 準治
    令和元年度 日本セラミックス協会 東北北海道支部研究発表会 2019年11月 ポスター発表
  • Fermi Level Depinning in Metal/Germanium Junctions by Insertion of Graphene Layers  [通常講演]
    Z. Khurelbaataar, S. Tsagaanchuluun, M. Fujioka, J. Nishii
    The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13) 2019年10月 ポスター発表
  • Thermal Stability of Proton Conductive Phosphate Glasses  [通常講演]
    T. Fang, T. Tatebayashi, M. Fujioka, H. Kaiju, Y. Ren, G. Zhao, J. Nishii
    The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13) 2019年10月 ポスター発表
  • Electric and magnetic properties in Ni78Fe22/Mq3(M=Al, Er)/Ni78Fe22 nanoscale junction devices utilizing magnetic thin-film edges  [通常講演]
    Y. Sasaki, R. Msiska,T. Misawa, S. Mori, T. Komine, N. Hoshino,T, Akutagawa, M. Fujioka, J. Nishii, H. Kaiju
    The 13th Pacific Rim Conference of Ceramic Societies(PACRIM13) 2019年10月 ポスター発表
  • ZnO Nanorods Fabrication via Submerged Illumination and its optoelectrical properties  [通常講演]
    メルバート ジェーム, 藤岡 正弥, 渡辺 精一, 西井 準治
    第80回応用物理学会秋季学術講演会 2019年09月 口頭発表(一般)
  • 固体電気化学を活用したアニオンのイオンポンピング  [招待講演]
    藤岡 正弥, メルバート ジェーム, 西井 準治
    第80回応用物理学会秋季学術講演会 2019年09月 口頭発表(招待・特別)
  • 水素イオンの極性を利用した固体電気化学合成  [通常講演]
    藤岡 正弥, メルバート ジェーム, 西井 準治
    日本金属学会2019年秋期(第165回)講演大会 2019年09月 口頭発表(一般)
  • Magnetocapacitance effect in spintronic device  [招待講演]
    H. Kaiju, T. Nagahama, O. Kitakami, J. Nishii, G. Xiao
    6th Japan-Korea International Symposium on Materials Science and Technology 2019(JKMST2019) 2019年08月 口頭発表(招待・特別)
  • Experimental and Theoretical Study on Tunnel Magnetocapacitance in Fe/MgF2 Nanogranular Films  [通常講演]
    R. Msiska, S. Honjo, Y. Asai, M. Arita, A. T. Fukuchi, Y. Takahashi, N, Hoshino,T. Akutagawa, O. Kitakami, M. Fujioka, J. Nishii, H. Kaiju
    6th Japan-Korea International Symposium on Materials Science and Technology 2019 (JKMST2019) 2019年08月 ポスター発表
  • 磁気トンネル接合における室温巨大磁気キャパシタンス効果  [招待講演]
    海住 英生, 長浜 太郎, 北上 修, 西井 準治, Xiao Gang
    日本磁気学会 第224回研究会 2019年07月 口頭発表(招待・特別)
  • 磁気キャパシタンス効果の新展開とその学理  [招待講演]
    海住 英生, 長浜 太郎, 北上 修, 西井 準治, Xiao Gang
    第1回 慶大スピントロにクス研究開発センター(CSRN at Keio Univ)研究会 2019年07月 口頭発表(招待・特別)
  • 磁気キャパシタンス効果の新展開  [招待講演]
    海住 英生, 長浜 太郎, 北上 修, 西井 準治, Xiao Gang
    第7回ナノスケール磁性体研究会 2019年04月 口頭発表(招待・特別)
  • 固体電気化学を利用した物質合成  [通常講演]
    藤岡 正弥, 佐藤 賢斗, 海住 英生, 西井 準治
    日本セラミックス協会2019年年会 2019年03月 口頭発表(一般)
  • 希土類含有リン酸塩ガラスのプロトン伝導性と熱的安定性  [通常講演]
    舘林 尭, Fang Tong, Fang Xinxiong, 藤岡 正弥, 海住 英生, Zhao Gaoyang, 西井 準治
    日本セラミックス協会2019年年会 2019年03月 口頭発表(一般)
  • 固体電気化学によるイオン制御とナノ空間の利用  [招待講演]
    藤岡 正弥, 海住 英生, 西井 準治
    日本金属学会2019年春季(第164回)講演大会 2019年03月 口頭発表(基調)
  • 外部磁場に依存したランダムレーザー発振特性の解析  [通常講演]
    藤原 英樹, 海住 英生, 西井 準治, 笹木 敬司
    2019年第66回応用物理学会春季学術講演会 2019年03月 口頭発表(一般)
  • 固体電気化学反応を利用した遷移金属カルコゲナイド層間化合物の合成  [通常講演]
    佐藤 賢斗, 藤岡 正弥, 長尾 雅則, 海住 英生, 西井 準治
    化学系学協会北海道支部2019年冬季研究発表会 2019年01月 口頭発表(一般)
  • 希土類及びアルカリ土類含有リン酸塩ガラスのプロトン伝導度の長時間維持  [通常講演]
    舘林 尭, Fang Xinxiong, 藤岡 正弥, 海住 英生, Zhao Gaoyang, 西井 準治
    化学系学協会北海道支部2019年冬季研究発表会 2019年01月 口頭発表(一般)
  • Electric and magnetic properties of Ni78Fe22/Alq3/Ni78Fe22 nanoscale junction devices utilizing magnetic thin-film edges  [通常講演]
    Y. Sasaki, R. Msiska,T. Misawa, S. Mori, T. Komine, N. Hoshino,T, Akutagawa, M. Fujioka, J. Nishii, H. Kaiju
    2019 Joint MMM-Intermag Conference 2019年01月 ポスター発表
  • Voltage-induced Magnetocapacitance in Magnetic Tunnel Junctions  [通常講演]
    H. Kaiju, T. Misawa, T. Nagahama, T. Komine, O. Kitakami, M. Fujioka, J. Nishii, G. Xiao
    2019 Joint MMM-Intermag Conference 2019年01月 口頭発表(一般)
  • 磁性薄膜エッジを利用したナノ接合分子スピントロニクスデバイス  [招待講演]
    海住 英生, 藤岡 正弥, 西井 準治
    ダイナミックアライアンスG1および物質・デバイス領域共同研究拠点事業合同研究会「有機分子集積体の機能設計と精密計測」 2018年12月 口頭発表(招待・特別)
  • Thermal stability of high-proton-conductive phosphate glasses containing rare earth elements  [通常講演]
    T. Tatebayashi, X. Fang, M. Fujioka, H. Kaiju, G. Zhao, J. Nishii
    The 19th RIES-HOKUDAI International Symposium 2018年12月 ポスター発表
  • Ni78Fe22/Alq3/Ni78Fe22 nanoscale junction devices utilizing magnetic thin-film edges  [通常講演]
    Y. Sasaki, R. Msiska,T. Misawa, S. Mori, T. Komine, N. Hoshino,T, Akutagawa, M. Fujioka, J. Nishii, H. Kaiju
    The 19th RIES-HOKUDAI International Symposium 2018年12月 ポスター発表
  • Tunnel Magnetocapacitance in Single-layered Fe/MgF2 Magnetic Granular Films  [通常講演]
    R. Msiska, S. Honjo, Y. Asai, M. Arita, A. T. Fukuchi, Y. Takahashi, N, Hoshino,T. Akutagawa, O. Kitakami, M. Fujioka, J. Nishii, H. Kaiju
    The 19th RIES-HOKUDAI International Symposium 2018年12月 ポスター発表
  • Synthesis of intercalation compound AgxZrTe3 by a topotactic reaction based on solid state electrochemistry  [通常講演]
    K. Sato, M. Fujioka, M. Nagao, H. Kaiju, J. Nishii
    The 19th RIES-HOKUDAI International Symposium 2018年12月 ポスター発表
  • Magnetocapacitance effect in magnetic tunnel junctions  [招待講演]
    H. Kaiju, T. Nagahama, O. Kitakami, J. Nishii, G. Xiao
    14th Hokkaido University-Nanjing University-NIMS/MANA Joint Symposium "Designed Chemistry for Future" 2018年12月 口頭発表(招待・特別)
  • Molecular nano-spintronic devices utilizing Ni78Fe22 thin-film edges  [通常講演]
    Y. Sasaki, R. Msiska,T. Misawa, S. Mori, T. Komine, N. Hoshino,T, Akutagawa, M. Fujioka, J. Nishii, H. Kaiju
    14th Hokkaido University-Nanjing University-NIMS/MANA Joint Symposium "Designed Chemistry for Future" 2018年12月 ポスター発表
  • Ni78Fe22薄膜エッジを利用したナノ接合分子スピントロニクスデバイス  [通常講演]
    佐々木 悠馬, Msiska Robin, 三澤 貴浩, 森 澄人, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 西井 準治, 海住 英生
    平成30年度 物質・デバイス領域共同研究拠点 展開共同研究B「新機能創出に向けたスピンダイナミクスに関する研究」研究会 2018年11月 口頭発表(一般)
  • Tunnel Magnetocapacitance in Fe/MgF2 Magnetic Nanogranular Films  [通常講演]
    R. Msiska, S. Honjo, Y. Asai, M. Arita, A. T. Fukuchi, Y. Takahashi, N, Hoshino,T. Akutagawa, O. Kitakami, M. Fujioka, J. Nishii, H. Kaiju
    平成30年度 物質・デバイス領域共同研究拠点 展開共同研究B「新機能創出に向けたスピンダイナミクスに関する研究」研究会 2018年11月 口頭発表(一般)
  • 固体電気化学を用いたトポタクティック反応によるAgxZrTe3の合成と超伝導の発現  [通常講演]
    佐藤 賢斗, 藤岡 正弥, 長尾 雅則, 海住 英生, 西井 準治
    平成30年度日本セラミックス協会東北北海道支部研究発表会 2018年11月 ポスター発表
  • Nb添加リン酸塩ガラスにおける高プロトン伝導性の長時間維持  [通常講演]
    舘林 尭, Fang Xinxiong, 藤岡 正弥, 海住 英生, Zhao Gaoyang, 西井 準治
    平成30年度日本セラミックス協会東北北海道支部研究発表会 2018年11月 口頭発表(一般)
  • 薄膜エッジを利用した磁性体/分子/磁性体ナノ接合デバイスの創製  [招待講演]
    海住 英生, 藤岡 正弥, 西井 準治
    9th分子アーキテクトニクス研究会 2018年11月 口頭発表(招待・特別)
  • 固体電気化学によるイオン制御とイオンビームへの応用  [通常講演]
    藤岡 正弥, 海住 英生, 西井 準治
    第7回アライアンス若手研究交流会 2018年11月 口頭発表(一般)
  • Tunnel Magnetocapacitance in Single-layered Fe/MgF2 Granular Films  [通常講演]
    R. Msiska, S. Honjo, Y. Asai, M. Arita, A. T. Fukuchi, Y. Takahashi, N, Hoshino,T. Akutagawa, O. Kitakami, M. Fujioka, J. Nishii, H. Kaiju
    第79回応用物理学会秋季学術講演会 2018年09月 口頭発表(一般)
  • 磁性薄膜エッジを利用したNi78Fe22/Alq3/Ni78Fe22ナノ接合素子の電気磁気特性  [通常講演]
    佐々木 悠馬, Msiska Robin, 三澤 貴浩, 森 澄人, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 西井 準治, 海住 英生
    第79回応用物理学会 秋季学術講演会 2018年09月 口頭発表(一般)
  • ステージ構造を有する ステージ構造を有する ステージ構造を有する Ag xTaSTaSTaS2の超電導特性  [通常講演]
    藤岡 正弥, 久保 直紀, 出村 郷志, 坂田 英明, 足立 伸太郎, 高野 義彦, 海住 英生, 西井 準治
    第79回応用物理学会 秋季学術講演会 2018年09月 口頭発表(一般)
  • 強磁性トンネル接合における電圧誘起磁気キャパシタンス効果  [通常講演]
    海住 英生, 三澤 貴浩, 長浜 太郎, 小峰 啓史, 北上 修, 藤岡 正弥, 西井 準治, Xiao Gang
    第42回日本磁気学会学術講演会 2018年09月 口頭発表(一般)
  • Study on Tunnel Magnetocapacitance in Fe/MgF2 Nanogranular Films  [通常講演]
    R. Msiska, S. Honjo, Y. Asai, M. Arita, A. T. Fukuchi, Y. Takahashi, N, Hoshino,T. Akutagawa, O. Kitakami, M. Fujioka, J. Nishii, H. Kaiju
    日本材料科学会第4回マテリアルズ・インフォマティクス基礎研究会 2018年09月 口頭発表(一般)
  • 磁性薄膜エッジを利用した分子ナノ接合素子の作製と電気磁気特性  [通常講演]
    佐々木 悠馬, Msiska Robin, 三澤 貴浩, 森 澄人, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 西井 準治, 海住 英生
    日本材料科学会第4回マテリアルズ・インフォマティクス基礎研究会 2018年09月 口頭発表(一般)
  • Topotactic Reaction using Solid State Electrochemistry  [招待講演]
    M. Fujioka, C. Wu, N. Kubo, K. Sato, H. Kaiju, J. Nishii
    日本材料科学会 第4回 マテリアルズ・インフォマティクス基礎研究会 2018年09月 口頭発表(招待・特別)
  • Fe/AlOx/Fe3O4磁気トンネル接合における逆磁気キャパシタンス効果  [通常講演]
    海住 英生, 長浜 太郎, 佐々木 駿, 島田 敏宏, 北上 修, 三澤 貴浩, 西井 準治, Xiao Gang
    日本物理学会第73回年次大会 2018年03月 口頭発表(一般)
  • プロトン駆動イオン導入法を用いたAg1/5TaS2の結晶構造と超伝導特性  [通常講演]
    藤岡 正弥, 白川 直樹, 長尾 雅則, 久保 直紀, 海住 英生, 西井 準治
    第65回応用物理学会 春季学術講演会 2018年03月 口頭発表(一般)
  • 外部磁場によるランダムレーザー発振モード制御  [通常講演]
    藤原 英樹, 海住 英生, 西井 準治, 笹木 敬司
    第65回応用物理学会春季学術講演会 2018年03月 口頭発表(一般)
  • スピンデバイスにおける磁気誘電効果の理論とその実証  [招待講演]
    海住 英生, 長浜 太郎, 北上 修, 西井 準治, Xiao Gang
    第2回マテリアルズ・インフォマティクス基礎研究会 2018年03月 口頭発表(招待・特別)
  • リン酸塩ガラスにおけるプロトン伝導特性と含有プロトン濃度の相関  [通常講演]
    舘林 尭, Fang Xinxiong, Bian Weibai, 藤岡 正弥, 海住 英生, Zhao Gaoyang, 西井 準治
    化学系学協会北海道支部2018年冬季研究発表会 2018年01月 ポスター発表
  • イオン導入量を制御したAgxTaS2の結晶構造及び電気磁気特性の評価  [通常講演]
    久保 直紀, 藤岡 正弥, 海住 英生, 西井 準治
    第53回応用物理学会北海道支部学術講演会 2018年01月 口頭発表(一般)
  • 磁性薄膜エッジを利用したNi78Fe22/Alq3/Ni78Fe22ナノ接合素子に関する研究  [通常講演]
    佐々木 悠馬, 三澤 貴浩, Msiska Robin, 森 澄人, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 西井 準治, 海住 英生
    第53回応用物理学会北海道支部/第14回日本光学会北海道支部合同学術講演会 2018年01月 口頭発表(一般)
  • 薄膜エッジを利用したナノスケール分子接合デバイス  [招待講演]
    海住 英生, 西井 準治
    東工大化生研講演会 2017年12月 口頭発表(招待・特別)
  • 磁気トンネル接合における逆磁気キャパシタンス効果  [招待講演]
    海住 英生, 長浜 太郎, 北上 修, 西井 準治, Xiao Gang
    第22回半導体スピン工学の基礎と応用 PASPS-22 2017年12月 口頭発表(招待・特別)
  • Study of Ni78Fe22/Alq3/Ni78Fe22 nanoscale junction devices utilizing thin-film edges  [通常講演]
    Y. Sasaki, T. Misawa, R. Msiska, S. Mori, T. Komine, N. Hoshino,T, Akutagawa, J. Nishii, H. Kaiju
    The 18th RIES-HOKUDAI International Symposium 2017年11月 ポスター発表
  • Effect of alkaline-earth and rare-earth ions on proton conductivity of phosphate glass  [通常講演]
    T. Tatebayashi, T. Yamaguchi, M. Fujioka, H. Kaiju, T. Omata, J. Nishii
    The 18th RIES-HOKUDAI International Symposium 2017年11月 ポスター発表
  • Mechanism behind superconductivity in Pt-based superconductors  [通常講演]
    M. Fujioka, H. Kaiju, J. Nishii
    The 18th RIES-HOKUDAI International Symposium 2017年11月 ポスター発表
  • Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe3O4  [通常講演]
    H. Kaiju, T. Nagahama, S. Sasaki, T. Shimada, O. Kitakami, T. Misawa, M. Fujioka, J. Nishii, G. Xiao
    62nd Annual Conference on Magnetism and Magnetic Materials 2017年11月 口頭発表(一般)
  • Fe/AlOx/Fe3O4における逆トンネル磁気キャパシタンス効果  [通常講演]
    海住 英生, 長浜 太郎, 佐々木 駿, 島田 敏宏, 北上 修, 三澤 貴浩, 藤岡 正弥, 西井 準治, Xiao Gang
    第41回日本磁気学会学術講演会 2017年09月 口頭発表(一般)
  • Novel Platinum-Based Superconductor LaPt5As with Unique Crystal Structure  [通常講演]
    M. Fujioka, H. Kaiju, J. Nishii
    13th European Conference on Applied Superconductivity 2017年09月 ポスター発表
  • Ni78Fe22/Alq3/Ni78Fe22ナノ接合素子の電気伝導特性  [通常講演]
    三澤 貴浩, 森 澄人, 佐々木 悠馬, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 西井 準治, 海住 英生
    第78回応用物理学会秋季学術講演会 2017年09月 口頭発表(一般)
  • Ni78Fe22/Alq3/Ni78Fe22接合素子における量子・古典状態間遷移領域に関する研究  [通常講演]
    佐々木 悠馬, 三澤 貴浩, 森 澄人, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 西井 準治, 海住 英生
    第78回応用物理学会秋季学術講演会 2017年09月 口頭発表(一般)
  • イオン導入における新手法を用いた物質合成  [通常講演]
    藤岡 正弥, 久保 直紀, 海住 英生, 西井 準治
    第78回応用物理学会秋季学術講演会 2017年09月 口頭発表(一般)
  • 強磁性トンネル接合における磁気キャパシタンス効果  [招待講演]
    海住 英生, 長浜 太郎, 北上 修, 西井 準治, Xiao Gang
    第34回光機能磁性デバイス・材料専門研究会 2017年09月 口頭発表(招待・特別)
  • 高電界イオン導入法を用いた新規材料の合成  [招待講演]
    藤岡 正弥, 猪石 篤, 岡田 重人, 海住 英生, 西井 準治
    第五回アライアンス若手研究交流会 2017年08月 口頭発表(招待・特別)
  • リン酸塩ガラスのプロトン伝導におけるアルカリ土類及び希土類イオンの影響  [通常講演]
    舘林 尭, Bian Weibai, 山口 拓哉, 藤岡 正弥, 海住 英生, 小俣 孝久, 西井 準治
    第49回日本セラミックス協会ガラス部会夏季若手セミナー 2017年08月 ポスター発表
  • リン酸塩ガラスのプロトン伝導におけるアルカリ土類及び希土類イオンの影響  [通常講演]
    舘林 尭, Bian Weibai, 藤岡 正弥, 海住 英生, 西井 準治, 山口 拓哉, 小俣 孝久
    日本化学会北海道支部2017年夏季研究発表会 2017年07月 口頭発表(一般)
  • YBa2Cu3O7-δナノ/マイクロワイヤの低温合成と輸送現象測定  [通常講演]
    村田 陽, 神原 陽一, 海住 英生, 藤岡 正弥, 西井 準治, 松本 裕介, Chelali Imad
    平成29年度日本材料科学会学術講演会 2017年06月 口頭発表(一般)
  • 計算機科学に基づいた磁気キャパシタンス効果の発見  [招待講演]
    海住 英生, 長浜 太郎, 北上 修, 西井 準治, Xiao Gang
    平成29年度日本材料科学会学術講演会 2017年06月 口頭発表(招待・特別)
  • 希土類含有リン酸塩ガラスのプロトン伝導特性  [通常講演]
    舘林 尭, 木下 拓也, 山口 拓哉, 藤岡 正弥, 海住 英生, 小俣 孝久, 西井 準治
    日本セラミックス協会2017年年会 2017年03月 口頭発表(一般)
  • アルカリ-プロトン置換したリン酸塩ガラスの伝導特性  [通常講演]
    木下 拓也, 藤岡 正弥, 海住 英生, 西井 準治, 山口 拓哉, 小俣 孝久
    日本セラミックス協会2017年年会 2017年03月 口頭発表(一般)
  • Large Magnetocapacitance Effect at Room Temperature in Magnetic Tunnel Junctions  [招待講演]
    H. Kaiju, T. Nagahama, O. Kitakami, J. Nishii, G. Xiao
    3rd Annual World Congress of Smart Materials 2017年03月 口頭発表(招待・特別)
  • Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe3O4  [通常講演]
    H. Kaiju, T. Nagahama, S. Sasaki, T. Shimada, O. Kitakami, T. Misawa, M. Fujioka, J. Nishii, G. Xiao
    第64回応用物理学会春季学術講演会 2017年03月 ポスター発表
  • Large tunnel magnetocapacitance in magnetic tunnel junctions  [招待講演]
    H. Kaiju, T. Nagahama, O. Kitakami, J. Nishii, G. Xiao
    7th Annual Congress on Materials Research and Technology 2017年02月 口頭発表(招待・特別)
  • 希土類元素を含有したプロトン伝導ガラスの熱的安定性  [通常講演]
    木下 拓也, 舘林 尭, 山口 拓哉, 藤岡 正弥, 海住 英生, 小俣 孝久, 西井 準治
    化学系学協会北海道支部2017年冬季研究発表会 2017年01月 ポスター発表
  • プロトン導入希土類含有ガラスの伝導特性  [通常講演]
    舘林 尭, 木下 拓也, 山口 拓哉, 藤岡 正弥, 海住 英生, 小俣 孝久, 西井 準治
    化学系学協会北海道支部2017年冬季研究発表会 2017年01月 ポスター発表
  • Superconductivity and Crystal Structure of LaPt5As with Extremely Long c Lattice Parameter  [通常講演]
    M. Fujioka, H. Kaiju, J. Nishii, Y. Takano
    IWSRFM2016 (International Workshop on Superconductivity and Related Functional Materials ) 2016年12月 口頭発表(一般)
  • Fabrication of Microstructure on Soda-lime Silicate Glass Using Corona Discharge  [通常講演]
    D. Sakai, M. Abe, K. Harada, T. Omatsu, I. Yoshida, T. Nishiura,T. Takemori, J. Nishii, H. Shibata
    The Sixth Japan-Korea Workshop on Digital Holography and Information Photonics 2016年12月 ポスター発表
  • Fabrication of proton conductive phosphate glass using corona discharge treatment  [通常講演]
    T. Kinoshita, T. Yamaguchi, M. Fujioka, H. Kaiju, T. Omata, J. Nishii
    The 17th RIES-Hokudai International Symposium 2016年12月 ポスター発表
  • Synthesis of a New NASICON-structured KxNa3-x-yHyV2(PO4)3 Using a Novel Ion Substitution Method  [通常講演]
    N. Kubo, C. Wu, M. Fujioka, H. Kaiju, J. Nishii
    The 17th RIES-Hokudai International Symposium 2016年12月 ポスター発表
  • 希土類酸化物含有リン酸塩ガラスのプロトン伝導性評価  [通常講演]
    木下 拓也, 山口 拓哉, 藤岡 正弥, 海住 英生, 小俣 孝久, 西井 準治
    第42回固体イオニクス討論会 2016年12月 口頭発表(一般)
  • Electrical Nanoimprint  [招待講演]
    J. Nishii
    The 33rd International Korea-Japan Seminar on Ceramics 2016年11月 口頭発表(招待・特別)
  • Behavior of alkali and alkaline-earth ions silicate glasses under DC voltage application  [招待講演]
    J. Nishii
    CerSJ-GOMD Joint Symposium on Glass Science and Technologies co-located with The 57th Meeting on Glass and Photonic Materials & The 12th Symposium of Glass Industry Conferences of Japan 2016年11月 口頭発表(招待・特別)
  • コロナ放電処理で作製したプロトン伝導ガラスの評価  [通常講演]
    木下 拓也, 山口 拓哉, 藤岡 正弥, 海住 英生, 小俣 孝久, 西井 準治
    平成28年度日本セラミックス協会東北北海道支部研究発表会 2016年10月 口頭発表(一般)
  • 高い耐熱性とプロトン伝導を示す希土類含有リン酸塩ガラスの作製  [通常講演]
    舘林 尭, 山口 拓哉, 藤岡 正弥, 海住 英生, 西井 準治
    平成28年度日本セラミックス協会東北北海道支部研究発表会 2016年10月 ポスター発表
  • 電圧印加ガラスインプリントによる特異な微細構造形成  [通常講演]
    久保 直紀, 三澤 貴浩, 藤岡 正弥, 海住 英生, 西井 準治
    平成28年度日本セラミックス協会東北北海道支部研究発表会 2016年10月 ポスター発表
  • New Intercalation Method for Layered Materials with Nanospace  [招待講演]
    M. Fujioka, H. Kaiju, J. Nishii
    Nano S&T-2016 2016年10月 口頭発表(招待・特別)
  • Fabrication of nanoscale junctions utilizing Ni78Fe22 thin-film edges for the creation of novel spin devices  [招待講演]
    T. Misawa, S. Mori, M. Fujioka, H. Kaiju, J. Nishii
    HOKUDAI-NCTU Joint Symposium on Nano, Photo and Bio Sciences 2016年10月 ポスター発表
  • Synthesis of a new NASICON-structured KxNa3-x-yHyV2(PO4)3 Using a Novel Ion Substitution Method  [通常講演]
    C. Wu, M. Fujioka, H. Kaiju, J. Nishii
    HOKUDAI-NCTU Joint Symposium on Nano, Photo and Bio Sciences 2016年10月 ポスター発表
  • Electrical Nanoimprint on Soda-lime Silicate Glass  [通常講演]
    J. Nishii, T. Misawa, M. Fujioka, H. Kaiju
    The 7th Japan-China-Korea Joint Conference on MEMS/NEMS 2016 2016年09月 口頭発表(一般)
  • 薄膜エッジを利用したNi78Fe22/Alq3/Ni78Fe22ナノ接合の作製とその構造・電気伝導特性  [通常講演]
    三澤 貴浩, 森 澄人, 小峰 啓史, 星野 哲久, 芥川 智行, 藤岡 正弥, 海住 英生, 西井 準治
    第77回応用物理学会秋季学術講演会 2016年09月 ポスター発表
  • 強磁性トンネル接合における室温巨大磁気キャパシタンス効果  [通常講演]
    海住 英生, 武井 将志, 三澤 貴浩, 長浜 太郎, 西井 準治, Xiao Gang
    第40回日本磁気学会学術講演会 2016年09月 口頭発表(一般)
  • Approaches for transport properties of YBCO micro-wires using nano-technology  [通常講演]
    Y. Matsumoto, M. Matoba, H. Kaiju, J. Nishii, S. R. Hall, Y. Kamihara
    1st Workshop on Novel Superconducting materials and biomimetic processes 2016 2016年07月 口頭発表(一般)
  • Synthesis of Transition Metal-Based High-Tc Superconducting Micro-Wire Using Bio-Polymer  [通常講演]
    I. Chelali, Y. Matsumoto, S. Kawaguchi, R. Sakagami, S. R. Hall, M. Matoba, H. Kaiju, J. Nishii, Y. Kamihara
    平成28年度日本材料科学会学術講演大会 2016年06月 口頭発表(一般)
  • Large magnetocapacitance effect in magnetic tunnel junctions at room temperature  [招待講演]
    H. Kaiju, T. Nagahama, J. Nishii, G. Xiao
    Collaborative Conference on 3D & Materials Research 2016年06月 口頭発表(招待・特別)
  • Fine pattern formation on silicate glasses under DC voltage application  [招待講演]
    J. Nishii, T. Misawa, M. Takei, S. Ikeda, T. Suzuki, K. Uraji, K. Yamamoto
    International Congress on Glass 2016年04月 口頭発表(招待・特別)
  • Electrical imprint for fine patterning of silicate glasses  [通常講演]
    J. Nishii
    The 3rd Glass Summit and Atomistic Simulations Workshop 2016年04月 口頭発表(招待・特別)
  • Magnetic and structural properties of Ni78Fe22 thin films sandwiched between borate glasses  [通常講演]
    T. Misawa, S. Mori, H. Kasa, M. Fujioka, H. Kaiju, J. Nishii
    第63回応用物理学会春季学術講演会 2016年03月 口頭発表(一般)
  • Large magnetocapacitance effect at room temperature in magnetic tunnel junctions  [通常講演]
    H. Kaiju, M. Takei, T. Misawa, T. Nagahama, J. Nishii, G. Xiao
    第63回応用物理学会春季学術講演会 2016年03月 口頭発表(一般)
  • 生体材料鋳型によるYBa2Cu3O7-δマイクロ/ナノワイヤの合成と評価  [通常講演]
    松本 裕介, 的場 正憲, 海住 英生, 西井 準治, Simon R. Hall, 神原 陽一
    第63回応用物理学会春季学術講演会 2016年03月 口頭発表(一般)
  • 漏洩磁場を利用したスピン量子十字デバイスの構造・磁気特性  [通常講演]
    海住 英生, 森 澄人, 三澤 貴浩, 小峰 啓史, 中村 晃輔, 藤岡 正弥, 西井 準治
    第63回応用物理学会春季学術講演会 2016年03月 ポスター発表
  • 新規プラチナ系超電導体の特異な結晶構造と超電導特性  [通常講演]
    藤岡 正弥, 石丸 学, 渋谷 泰蔵, 神原 陽一, 田畑 千紘, 網塚 浩, 田中 将嗣, 高野 義彦, 海住 英生, 西井 準治
    日本物理学会第71回年次大会 2016年03月 口頭発表(一般)
  • アルカリ−プロトン置換したリン酸塩ガラスの伝導特性と熱的特性  [通常講演]
    木下 拓也, 宮崎 篤, 藤岡 正弥, 海住 英生, 西井 準治, 山口 拓哉, 小俣 孝久
    日本セラミックス協会2016年年会 2016年03月 口頭発表(一般)
  • 交流スピントロニクスの最前線  [招待講演]
    海住英生, 西井準治
    第8回 物質探索・設計セミナー 2016年02月 口頭発表(招待・特別)
  • Magnetic properties of Ni78Fe22 thin films sandwiched between glasses and nanoscale electronic conduction through Alq3 in spin quantum cross devices  [通常講演]
    S. Mori, T. Misawa, H. Kasa, K. Nakamura, H. Kaiju, J. Nishii
    The 4th Frontier Chemistry Center International Symposium 2016年02月 ポスター発表
  • ガラスナノインプリント技術(微細化の限界)  [招待講演]
    西井準治
    応用物理学会極限ナノ構造・構造物性研究会 2016年01月 口頭発表(招待・特別)
  • ランタノイド含有リン酸塩ガラスのアルカリ−プロトン置換による中温域プロトン伝導体の作製  [通常講演]
    宮崎 篤, 山口 拓哉, 海住 英生, 小俣 孝久, 西井 準治
    化学系学協会北海道支部2016年冬季研究発表会 2016年01月 口頭発表(一般)
  • 電気化学的アルカリ-プロトン置換により作製した新規プロトン伝導性リン酸塩ガラス  [通常講演]
    山口 拓哉, 西井 準治, 山下 俊晴, 川副 博司, 小俣 孝久
    2015年電気化学会秋季大会 2015年08月 ポスター発表
  • NaO₁/₂-CaO-LaO₃/₂-GeO₂-PO₅/₂ 系ガラスのアルカリ-プロトン置換とイオン伝導度  [通常講演]
    宮崎 篤, 川口 慶雅, 海住 英生, 西井 準治, 山口 拓哉, 小俣 孝久
    日本セラミックス協会2015年年会 2015年03月 口頭発表(一般)
  • Cryo-TEM-EDS によるガラス局所の組成パターンの分析  [通常講演]
    池田 定達, 裏地 啓一郎, 鈴木 俊夫, 山本 清, 西井 準治
    日本セラミックス協会2015年年会 2015年03月 口頭発表(一般)
  • Na₂O-La₂O₃-P₂O₅-GeO₂ 系ガラスの Na+-H+置換とプロトン伝導性評価  [通常講演]
    木下 拓也, 川口 慶雅, 宮崎 篤, 海住 英生, 西井 準治, 山口 拓哉, 小俣 孝久
    日本セラミックス協会2015年年会 2015年03月 口頭発表(一般)
  • スピン量子十字デバイス創製に向けたCoとNi78Fe22薄膜の磁気特性  [通常講演]
    森 澄人, 三澤 貴浩, 笠 晴也, 阿部 太郎, 海住 英生, 西井 準治
    第62回応用物理学会春季学術講演会 2015年03月 口頭発表(一般)
  • 低融点ガラスに挟まれたCo薄膜の磁気特性評価とスピン注入デバイスへの応用  [通常講演]
    三澤 貴浩, 森 澄人, 阿部 太郎, 笠 晴也, 海住 英生, 西井 準治
    第62回応用物理学会春季学術講演会 2015年03月 口頭発表(一般)
  • コロナ放電選択堆積によるガラスホログラム  [通常講演]
    酒井 大輔, 神成 邦弘, 氏家 健太郎, 原田 建治, 原 悠一郎, 池田 弘, 西井 準治
    第62回応用物理学会春季学術講演会 2015年03月 ポスター発表
  • 液体金属を用いたフレキシブルな反射型回折格子  [通常講演]
    橋本 拓也, 斉藤 光徳, 山田 逸成, 西井 準治
    第62回応用物理学会春季学術講演会 2015年03月 ポスター発表
  • 周期構造素子の作製と蛍光増強への応用  [招待講演]
    西井 準治, 田和 圭子, 三ツ石 方也
    2015年電子情報通信学会総合大会 2015年03月 口頭発表(招待・特別)
  • スピン量子十字デバイスにおける低融点ガラス上のCoとNi75Fe25薄膜の磁気特性  [通常講演]
    森 澄人, 三澤 貴浩, 笠 晴也, 阿部 太郎, 海住 英生, 西井 準治
    第50回応用物理学会北海道支部/第11回日本光学会北海道地区合同学術講演会 2015年01月 口頭発表(一般)
  • Co薄膜エッジを利用したスピン注入デバイスの創製および特性評価  [通常講演]
    三澤 貴浩, 森 澄人, 阿部 太郎, 笠 晴也, 海住 英生, 西井 準治
    第50回応用物理学会北海道支部/第11回日本光学会北海道地区合同学術講演会 2015年01月 口頭発表(一般)
  • コロナ放電処理によるリン酸塩ガラスへのプロトン導入  [通常講演]
    木下 拓也, 宮崎 篤, 海住 英生, 西井 準治, 山口 拓哉, 小俣 孝久
    日本化学会北海道支部2015年夏季研究発表会 2015年
  • コロナ放電により選択的に堆積されるSiO2の特性  [通常講演]
    酒井 大輔, 原田 建治, 原 悠一郎, 西井 準治
    第76回応用物理学会秋季学術講演会 2015年
  • コロナ放電によってアルカリ−プロトン置換したリン酸塩ガラスの構造と伝導度評価  [通常講演]
    木下 拓也, 宮崎 篤, 海住 英生, 西井 準治, 山口 拓哉, 小俣 孝久
    日本セラミックス協会第28回秋季シンポジウム 2015年
  • コロナ放電処理によるケイ酸塩およびリン酸塩ガラスへのプロトン導入  [通常講演]
    木下 拓也, 宮崎 篤, 藤岡 正弥, 海住 英生, 山口 拓哉, 小俣 孝久, 西井 準治
    第56回ガラスおよびフォトニクス材料討論会 2015年
  • 水素雰囲気コロナ放電処理によるプロトン伝導体の作製  [通常講演]
    木下 拓也, 宮崎 篤, 藤岡 正弥, 海住 英生, 山口 拓哉, 小俣 孝久, 西井 準治
    第41回固体イオニクス討論会 2015年
  • ランタノイド酸化物添加リン酸塩ガラスのプロトン伝導特性  [通常講演]
    宮崎 篤, 山口 拓哉, 海住 英生, 小俣 孝久, 西井 準治
    第41回固体イオニクス討論会 2015年
  • Magnetic properties of Co and Ni75Fe25 thin films on low-melting-point glasses in spin quantum cross devices  [通常講演]
    S. Mori, T. Misawa, H. Kasa, T. Abe, H. Kaiju, J. Nishii
    The 15th Ries-Hokudai International Symposium joined with the 3rd International Symposium of Nano-Macro Materials, Devices, and System Research Alliance Project 2014年12月 ポスター発表
  • Evaluation of proton conductivity of alkali-proton substituted NaO1/2-CaO-LaO2/3-PO2/5 glasses  [通常講演]
    A. Miyazaki, K. Kawaguchi, T. Yamaguchi, T. Omata, H. Kaiju, J. Nishii
    The 15th Ries-Hokudai International Symposium joined with the 3rd International Symposium of Nano-Macro Materials, Devices, and System Research Alliance Project 2014年12月 ポスター発表
  • Potassium ion migration between non-contacted glass plates using corona discharge treatment in H2 atmosphere  [通常講演]
    K. Kawaguchi, H. Kaiju, J. Nishii
    The 31st International Korea-Japan Seminar on Ceramics 2014年11月 口頭発表(一般)
  • ゾル-ゲル法とインプリント加工による酸化チタンのサブ波長周期構造の形成と光学評価  [通常講演]
    石原 吉朗, 山田 逸成, 秋山 毅, 西井 準治
    第55回ガラスおよびフォトニクス材料討論会 2014年11月 ポスター発表
  • Na2O-CaO-La2O3-P2O5 系ガラスのアルカリ-プロトン置換とプロトン伝導性の評価  [通常講演]
    宮崎 篤, 川口 慶雅, 山口 拓哉, 小俣 孝久, 西井 準治
    第55回ガラスおよびフォトニクス材料討論会 2014年11月 ポスター発表
  • コロナ放電および電圧印加処理したガラス表層の分析  [通常講演]
    鈴木 俊夫, 関根 朋美, 小林 大介, 山本 清, 西井 準治
    第55回ガラスおよびフォトニクス材料討論会 2014年11月 ポスター発表
  • コロナ放電によるアルミノシリケートガラスへのプロトン導入  [通常講演]
    川口 慶雅, 海住 英生, 西井 準治
    第55回ガラスおよびフォトニクス材料討論会 2014年11月 口頭発表(一般)
  • コロナ放電処理による重ね合わせガラス間のアルカリイオン移動  [通常講演]
    川口 慶雅, 海住 英生, 西井 準治
    平成26年度日本セラミックス協会東北北海道支部研究発表会 2014年11月 口頭発表(一般)
  • 電圧印加インプリント法によるガラス表面への微細構造形成  [通常講演]
    阿部 太郎, 三澤 貴浩, 生田目 直季, 海住 英生, 西井 準治
    平成26年度日本セラミックス協会東北北海道支部研究発表 2014年11月 ポスター発表
  • Structural and Magnetic Properties of Co-based Spin Quantum Cross Devices Utilizing Stray Magnetic Fields  [通常講演]
    H. Kaiju, H. Kasa, T. Komine, S. Mori, T. Misawa, T. Abe, J. Nishii
    The 59th Annual Magnetism and Magnetic Materials Conference 2014年11月 ポスター発表
  • Pressure Dependence of Fine Structure formation on Glass Surface by Electrical Nanoimprint  [通常講演]
    T. Misawa, N. Ikutame, T. Abe, H. Kaiju, J. Nishii, D. Sakai, K. Harada
    The 13th International Conference on Nanoimprint and Nanoprint Technology 2014年10月 ポスター発表
  • Electrical imprint for micro- and nano-structure fabrications on glass  [招待講演]
    西井準治
    Advanced Architectures in Photonics 2014 2014年09月 口頭発表(招待・特別)
  • 漏洩磁場を用いたスピン量子十字デバイスの磁気特性  [通常講演]
    森 澄人, 三澤 貴浩, 笠 晴也, 小峰 啓史, 阿部 太郎, 海住 英生, 西井 準治
    第75回応用物理学会秋季学術講演会 2014年09月 ポスター発表
  • 両面インプリントにより反射防止機能を付加した赤外ワイヤグリッド偏光子の作製  [通常講演]
    吉田 黎, 山田 逸成, 山下 直人, 栄西 俊彦, 斉藤 光徳, 福味 幸平, 西井 準治
    第75回応用物理学会秋季学術講演会 2014年09月 ポスター発表
  • 高効率スピン注入デバイスの創製に向けた低融点ガラス上のCo薄膜の磁気特性  [通常講演]
    三澤 貴浩, 森 澄人, 笠 晴也, 海住 英生, 西井 準治
    第75回応用物理学会秋季学術講演会 2014年09月 口頭発表(一般)
  • FeAl表面上のレーザー誘起磁気転移の波長依存性  [通常講演]
    吉田 裕, 渡辺 精一, 海住 英生, 西井 準治, 吉見 享祐
    第75回応用物理学会秋季学術講演会 2014年09月 口頭発表(一般)
  • 一次元金属回折格子上での高分子ナノ集積体中の光の伝搬特性  [通常講演]
    印藤 健也, 森田 晋平, 山本 俊介, 田和 圭子, 西井 準治, 宮下 徳治, 三ツ石 方也
    第75回応用物理学会秋季学術講演会 2014年09月 口頭発表(一般)
  • コロナ放電処理を用いた間隙を有する異種ガラス間のアルカリイオン移動  [通常講演]
    川口 慶雅, 海住 英生, 西井 準治
    第75回応用物理学会秋季学術講演会 2014年09月 口頭発表(一般)
  • Magnetic Properties of FeAl Nanopatterns Induced by Nanosecond Pulsed Laser Irradiation  [招待講演]
    H. Kaiju, Y. Yoshida, S. Watanabe, J. Nishii, K. Yoshimi
    HOKUDAI-NCTU Joint Symposium on Nano, Photo and Bio Sciences 2014年09月 口頭発表(招待・特別)
  • FeAl合金における磁気特性の照射レーザー波長依存性  [通常講演]
    吉田 裕, 渡辺 精一, 海住 英生, 西井 準治, 吉見 享祐
    第38回日本磁気学会学術講演会 2014年09月 口頭発表(一般)
  • Magnetic properties of nanostructured FeAl alloy  [通常講演]
    S. Mori, H. Kaiju, J. Nishii
    ISNOG2014 2014年08月 ポスター発表
  • Formation mechanism of fine structures using electrical imprint method  [通常講演]
    T. Misawa, N. Ikutame, D. Sakai, T. Abe, H. Kaiju, J. Nishii
    ISNOG2014 2014年08月 口頭発表(一般)
  • Spin quantum cross devices utilizing stray magnetic field  [通常講演]
    S. Mori, T. Misawa, H. Kasa, T. Komine, T. Abe, H. Kaiju, J. Nishii
    The 1st Korea–Japan Bilateral Workshop on Functional Materials Science 2014年08月 ポスター発表
  • Periodic structure optical components fabricated by nanoimprint process  [招待講演]
    西井準治
    2nd International Workshop on Ultrafast Laser Optoelectronics 2014年07月 シンポジウム・ワークショップパネル(指名)
  • Structural and magnetic transitions of an FeAl alloy induced by nanosecond pulsed laser irradiation  [招待講演]
    H. Kaiju, Y. Yoshida, S. Watanabe, J. Nishii, K. Yoshimi
    Collaborative Conference on Materials Research 2014 2014年06月 口頭発表(招待・特別)
  • Fine structure formation on glass surface using electrical imprint method  [通常講演]
    T. Misawa, N. Ikutame, D. Sakai, T. Abe, H. Kaiju, J. Nishii
    The 3rd Frontier Chemistry Center International Symposium 2014年06月 シンポジウム・ワークショップパネル(公募)
  • Fabrication of Subwavelength Optics using Glass Imprint Process  [招待講演]
    西井準治
    CLEO:2014 2014年06月 口頭発表(招待・特別)
  • 電圧勾配下でのアルカリ挙動を巧みに利用した酸化物ガラスの改質と機能発現  [招待講演]
    西井準治
    紛体粉末冶金協会平成26年度春季大会 2014年06月 口頭発表(招待・特別)
  • 鉄系超伝導体SmFeAsO1-xFxの臨界電流密度と磁場侵入長  [通常講演]
    飯原 潤, 庄司 浩一朗, 二瓶 卓也, 的場 正憲, 海住 英生, 西井 準治, 神原 陽一
    2014年春季低温工学・超電導学会 2014年05月 口頭発表(一般)
  • Magnetic properties of spin quantum cross devices utilizing stray magnetic fields  [通常講演]
    Kaiju, H. Kasa, T. Komine, T. Abe, T. Misawa, J. Nishii
    2014 Material Research Society Spring Meeting 2014年04月 ポスター発表
  • 電圧印加ガラスインプリントによる微細構造の形成機構解明  [通常講演]
    三澤 貴浩, 生田目 直季, 酒井 大輔, 阿部 太郎, 原田 建治, 西井 準治
    第61回応用物理学会春季学術講演会 2014年03月 口頭発表(一般)
  • コロナ放電処理を利用したソーダライムガラスの異方性ウェットエッチング  [通常講演]
    酒井 大輔, 西浦 崇雄, 角田 聡, 西井 準治
    第61回応用物理学会春季学術講演会 2014年03月 口頭発表(一般)
  • 電圧印加インプリントによるガラス表面への微細構造形成  [通常講演]
    三澤 貴浩, 生田目 直季, 酒井 大輔, 阿部 太郎, 西井 準治
    The 24th Meeting on Glasses for Photonics 2014 2014年02月 口頭発表(一般)
  • Plasmonic characteristics of palladium for hydrogen sensing  [通常講演]
    T. Shibata, J. Nishii
    The 14th RIES-Hokudai International symposium 2013年12月 ポスター発表
  • Introduction of Proton into Phosphate Glass under Corona Discharge Plasma in Hydrogen Atmosphere  [通常講演]
    T. Shoji, H. Ikeda, D. Sakai, J. Nishii
    The 14th RIES-Hokudai International symposium 2013年12月 ポスター発表
  • 水素雰囲気中におけるコロナ放電処理によるイオン交換  [通常講演]
    川口 慶雅, 池田 弘, 酒井 大輔, 原田 建治, 秋葉 周作, 鈴木 俊夫, 西井 準治
    第54回ガラスおよびフォトニクス材料討論会 2013年11月 ポスター発表
  • Pd金属を用いた表面プラズモンによる水素検出  [通常講演]
    柴田 智広, 西井 準治
    第54回ガラスおよびフォトニクス材料討論会 2013年11月 ポスター発表
  • コロナ放電処理されたガラス表層の深さ方向分析  [通常講演]
    鈴木 俊夫, 関根 朋美, 秋葉 周作, 山本 清, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    第54回ガラスおよびフォトニクス材料討論会 2013年11月 ポスター発表
  • Cation Exchange in Glasses Using Corona Discharge Treatment  [通常講演]
    K. Kawaguchi, H. Ikeda, D. Sakai, K. Harada, S. Akiba, T. Suzuki, J. Nishii
    The 30th Japan-Korea International Seminar on Cerami 2013年11月 口頭発表(一般)
  • Plasmonic coupling characteristics of palladium grating for hydrogen sensing  [通常講演]
    T. Shibata, H. Ikeda, J. Nishii
    The 30th Japan-Korea International Seminar on Cerami 2013年11月 口頭発表(一般)
  • Proton Injection into Phosphate Glasses by Corona Discharge Treatment  [通常講演]
    T. Shoji, H. Ikeda, D. Sakai, J. Nishii
    The 30th Japan-Korea International Seminar on Ceramic 2013年11月 口頭発表(一般)
  • 水素センシングのためのパラジウムグレーティングのプラズモン特性  [通常講演]
    柴田 智広, 西井 準治
    日本セラミックス協会東北北海道支部研究発表会 2013年10月 口頭発表(一般)
  • プロトン導入によるリン酸塩ガラス中の構造変化と伝導性評価  [通常講演]
    荘司 孝斗, 池田 弘, 酒井 大輔, 西井 準治
    日本セラミックス協会東北北海道支部研究発表会 2013年10月 口頭発表(一般)
  • Selective SiO2 Deposition on Electrically Imprinted Glass Surfaces  [通常講演]
    D. Sakai, N. Ikutame, K. Kawaguchi, J. Nishii, H. Ikeda, K. Harada
    NNT2013 2013年10月 ポスター発表
  • Fabrication of fine structures on a glass using electrical nanoimprint process  [通常講演]
    Ikutame, D. Sakai, J. Nishii, H. Ikeda, K. Harada
    NNT2013 2013年10月 ポスター発表
  • コロナ放電を用いたガラスホログラムの潜像記録及び顕在化  [通常講演]
    酒井 大輔, 原田 建治, 原 悠一郎, 池田 弘, 山本 清, 山本 雄一, 舩津 志郎, 西井 準治
    ホログラフィック・ディスプレイ研究会 2013年10月 口頭発表(一般)
  • Visualizing Method of Index Modulated Hologram in Glass Using Corona Discharge  [招待講演]
    D. Sakai, K. Harada, J. Nishii
    IWH2013 2013年10月 口頭発表(招待・特別)
  • コロナ放電を用いたガラスへの潜像記録及び顕在化  [通常講演]
    酒井 大輔, 原田 建治, 原 悠一郎, 池田 弘, 山本 清, 山本 雄一, 舩津 志郎, 西井 準治
    第14回情報フォトニクス研究グループ研究会 2013年09月 口頭発表(招待・特別)
  • Fluorescence Imaging of Neuron Cells Cultured on a Plasmonic Dish  [通常講演]
    K. Tawa, T. Yasui, C. Hosokawa, J. Nishii, H. Aota
    2013 JSAP-MRS Joint Symposia 2013年09月 口頭発表(一般)
  • 電圧印加ガラスインプリントによる高アスペクト比構造の形成  [通常講演]
    生田目 直季, 池田 弘, 酒井 大輔, 原田 建治, 秋葉 周作, 鈴木 俊夫, 西井 準治
    第74 回応用物理学会秋季学術講演会 2013年09月 口頭発表(一般)
  • 表面プラズモン共鳴/ 導波モード励起を利用した発光ナノデバイスによる偏光識別  [通常講演]
    印藤 健也, 森田 晋平, 山本 俊介, 田和 圭子, 西井 準治, 三ツ石 方也, 宮下 徳治
    第74 回応用物理学会秋季学術講演会 2013年09月 口頭発表(一般)
  • コロナ放電選択堆積によって形成した周期構造  [通常講演]
    酒井 大輔, 池田 弘, 原田 建治, 原 悠一郎, 山本 清, 山本 雄一, 西井 準治
    第74 回応用物理学会秋季学術講演会 2013年09月 口頭発表(一般)
  • コロナ放電処理によるガラス中のアルカリイオン交換  [通常講演]
    川口 慶雅, 池田 弘, 酒井 大輔, 原田 建治, 秋葉 周作, 鈴木 俊夫, 西井 準治
    第74 回応用物理学会秋季学術講演会 2013年09月 口頭発表(一般)
  • Selective chemical vapor deposition for electrically pretreated glass  [通常講演]
    D. Sakai, H. Ikeda, K. Harada, Y. Hara, K. Yamamoto, J. Nishii
    Optics in Engineering 2013 2013年09月 ポスター発表
  • 人々が光を操ろうとした訳  [通常講演]
    西井準治
    夢・化学-21「北海道大学化学系への二日間体験入学」 2013年08月 公開講演,セミナー,チュートリアル,講習,講義等
  • 電圧印加ガラスインプリントによる微細構造の形成機構解明  [通常講演]
    生田目 直季, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    日本化学会北海道支部2013年夏季研究発表会 2013年07月 口頭発表(一般)
  • コロナ放電処理によるシリケートガラス中のアルカリ−プロトン置換  [通常講演]
    川口 慶雅, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    日本化学会北海道支部2013年夏季研究発表会 2013年07月 口頭発表(一般)
  • 川口 慶雅, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    第48回応用物理学会北海道支部学術講演会 2013年 口頭発表(一般)
  • 電圧印加インプリントによるガラス表面への微細構造形成  [通常講演]
    生田目 直季, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    第48回応用物理学会北海道支部学術講演会 2013年
  • コロナ放電処理によるアルカリ含有ガラスの赤外吸収スペクトル変化  [通常講演]
    川口 慶雅, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    日本セラミックス協会The23th Meeting on Glasses for Photonics 2013年
  • BaO-Nb2O5-P2O5ガラスの光学特性とラマン散乱  [通常講演]
    北村 直之, 西井 準治
    日本セラミックス協会2013年年会 2013年
  • 電圧印加インプリントによる ガラス表面への微細構造形成  [通常講演]
    生田目 直季, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    日本セラミックス協会2013年年会 2013年
  • 高屈折率BaO-Nb2O5-P2O5 ガラスの光学特性  [通常講演]
    北村 直之, 西井 準治
    第60回応用物理学会春季学術講演会 2013年
  • アルカリ含有アルミノケイ酸塩ガラスへのプロトン注入  [通常講演]
    川口 慶雅, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    第60回応用物理学会春季学術講演会 2013年
  • 電圧印加インプリントによるガラス表面への微細構造形成  [通常講演]
    生田目 直季, 池田 弘, 酒井 大輔, 原田 建治, 西井 準治
    第60回応用物理学会春季学術講演会 2013年
  • プラズモン回折格子  [通常講演]
    西井 準治, 田和 圭子, 金高 健二
    ナノインプリント研究会 2012年
  • テーパファイバ結合トロイド共振器を介した局在プラズモンの高効率励起  [通常講演]
    北嶋 千誉, 高島 秀聡, 藤原 英樹, 西井 準治, 笹木 敬司
    第47回応用物理学会北海道支部/第8回日本光学会北海道地区合同学術講演会 2012年
  • 金属周期構造を用いた高感度プラズモニックチップの研究  [通常講演]
    西山 宏昭, 西井 準治
    応用物理学会北海道支部学術講演会 2012年
  • プラズモン回折格子の金属膜質と光学特性  [通常講演]
    柴田 智広, 西山 宏昭, 西井 準治
    The 22nd Meeting on Glasses for Photonics 2012年
  • 表面プラズモン/導波モード共存条件を満たした高分子ナノ集積体による発光変調と旋光識別  [通常講演]
    森田 晋平, 三ツ石 方也, 田和 圭子, 西井 準治, 宮下 徳治
    第59回応用物理学関係連合講演会 2012年
  • プラズモン回折格子の光学特性  [通常講演]
    西井 準治, 柴田 智広, 西山 宏昭, 田和 圭子, 池田 弘
    第59回応用物理学関係連合講演会 2012年
  • 平板モールドプレスによるガラスの離型挙動  [通常講演]
    池田 弘, 笠 晴也, 眞山 博幸, 西山 宏昭, 西井 準治
    日本セラミックス協会2012年年会 2012年
  • プラズモニックチップ上で培養した神経細胞の高感度蛍光顕微鏡観察  [通常講演]
    安井 力, 田和 圭子, 細川 千恵, 西井 準治, 青田 浩幸, 松本 昭
    日本化学会第92春季年会(2012) 2012年
  • Sensitive fluorescence microscopic observation of neurons cultured on a plasmonic chip  [通常講演]
    K. Tawa, J. Nishii
    International Conference on the Nanostructure-Enhanced Photo-Energy Conversion 2012年
  • Plasmon Gratings for Fluorescence Imaging  [通常講演]
    J. Nishii, K. Tawa
    International Conference on the Nanostructure-Enhanced Photo-Energy Conversion 2012年
  • Plasmonic band structures and enhanced fluorescence on periodic silver structures  [通常講演]
    Y. Sugawara, J. Nishii, K. Tawa
    International Conference on the Nanostructure-Enhanced Photo-Energy Conversion 2012年
  • “Guiding mode generation in chemicaly amplified resists induced by femtosecond laser direct polymerization  [通常講演]
    H. Nishiyama, M. Mizoshiri, J. Nishii
    13th International Symposium on Laser Precision Microfabrication 2012年
  • Switchable SiN microfluidic lenses fabricated using femtosecond laser nonlinear lithography  [通常講演]
    H. Nishiyama, J. Nishii
    13th International Symposium on Laser Precision Microfabrication 2012年
  • Fluorescence Enhancement using Grating-Coupled Surface Plasmon Resonance  [通常講演]
    J. Nishii, K. Tawa
    International Symposium on Non-Oxide and New Optical Glasses 2012年
  • Investigation of deformation and demolding behaviors for precision glass molding  [通常講演]
    H. Ikeda, H. Kasa, H. Mayama, H. Nishiyama, J. Nishii
    4th International Congress on Ceramics 2012年
  • 有機‐無機コンポジット法による 階層構造を有した多孔質体の作製  [通常講演]
    池田 弘, 眞山 博幸, 西井 準治
    日本化学会北海道支部2012年夏季研究発表会 2012年
  • プラズモン回折格子の形状パラメータおよび金属膜質の最適化  [通常講演]
    西山 宏昭, 光波制御材料, 担当者, 池田 弘, 西井 準治
    第73回応用物理学会学術講演会 2012年
  • 金属構造がフェムト秒レーザ二光子還元に与える影響  [通常講演]
    西山 宏昭, 光波制御材料, 担当者, 西井 準治
    第73回応用物理学会学術講演会 2012年
  • OPTIMIZATION OF METAL QUALITY FOR GRATING COUPLED SURFACE PLASMON RESONANCE  [通常講演]
    T. Shibata, H. Ikeda, H. Nishiyama, K. Tawa, J. Nishii
    XIII International Conference on Physics of Non-Crystalline Solids 2012年
  • COORDINATION STATES OF W AND Nb IN PHOSPHATE GLASSES  [通常講演]
    T. Shoji, H. Ikeda, H. Nishiyama, J. Nishii
    XIII International Conference on Physics of Non-Crystalline Solids 2012年
  • Glass-imprinting for Optical Device Fabrication  [通常講演]
    J. Nishii
    XIII International Conference on Physics of Non-Crystalline Solids 2012年
  • Deformation and demolding behavior of glasses by parallel mold pressing  [通常講演]
    H. Ikeda, H. Kasa, H. Mayama, H. Nishiyama, J. Nishii
    XIII International Conference on Physics of Non-Crystalline Solids 2012年
  • ガラスナノインプリントにおける離型評価と微細構造形成  [通常講演]
    池田 弘, 笠 晴也, 西山 宏昭, 西井 準治
    日本セラミックス協会東北北海道支部研究発表会 2012年
  • インプリント法を用いた長距離伝搬型プラズモン回折格子の作製  [通常講演]
    柴田 智広, 池田 弘, 西山 宏昭, 西井 準治
    日本セラミックス協会東北北海道支部研究発表会 2012年
  • コロナ放電によるタングステンリン酸塩ガラスへのプロトン注入  [通常講演]
    荘司 孝斗, 池田 弘, 西山 宏昭, 西井 準治
    日本セラミックス協会東北北海道支部研究発表会 2012年
  • Glass-imprinting for Optical Device Fabrication  [通常講演]
    J. Nishii
    The 29th International Korea-Japan Seminar on Ceramics 2012年
  • 微細構造を用いたフォトニクス機能とその応用  [通常講演]
    西山 宏昭, 西井 準治
    北大-理研連携研究分野セミナー 2011年
  • 光−分子強結合反応場のための 微細光学素子の創成と集積化  [通常講演]
    西井 準治
    特定領域研究「光−分子強結合反応場の創成」第8回公開シンポジウム 2011年
  • 次世代光学素子の製造のためのナノインプリント技術  [通常講演]
    西井 準治
    第2回 ナノインプリント技術フェア(ファインテックジャパン) 2011年
  • サブ波長光学による高効率フォトン利用デバイスの研究 −非線形光リソグラフィーによるり立ち的表面加工−  [通常講演]
    西山 宏昭, 眞山 博幸, 西井 準治
    ナノマクロ物質・デバイス・システム創製アライアンス第2回新エネルギー材料・デバイスグループ研究会 2011年
  • 金属ナノ構造と微小共振器を結合した高効率光反応システムの構築  [通常講演]
    藤原 英樹, 田中 嘉人, 高島 秀聡, 西井 準治, 笹木 敬司
    「新エネルギー材料・デバイス」グループ研究会 2011年
  • Photonic functions induced by subwavelength structure  [通常講演]
    J. Nishii
    2011 RIES-CIS Symposium 2011年
  • Thermodynamics and dynamics in wetting  [通常講演]
    H. Mayama, H. Nishiyama, J. Nishii
    The 12th RIES-Hokudai International Symposium "観" 2011年
  • Glass imprint process for optical device fabrication  [通常講演]
    N. Kitamura, K. Fukumi, J. Nishii
    Photonics West 2011 2011年
  • 表面プラズモン増強蛍光観察のための回折格子形状の最適化  [通常講演]
    西井 準治, 柴田 千尋, 田和 圭子, 金高 健二
    春季第58回応用物理学関係連合講演会 2011年
  • 高分子ナノシート/CdSeナノ粒子ハイブリッドナノ集積体の格子結合型導波モードによる発光制御  [通常講演]
    森田 晋平, 三ツ石 方也, 宮下 徳治, 田和 圭子, 西井 準治
    春季第58回応用物理学関係連合講演会 2011年
  • プラズモニックチップを用いた新しい高感度蛍光顕微鏡システムの開発  [通常講演]
    安井 力, 田和 圭子, 西井 準治, 青田 浩幸, 松本 昭
    春季第58回応用物理学関係連合講演会 2011年
  • フェムト秒レーザ直接重合による光閉じ込め効果の検討  [通常講演]
    西山 宏昭, 溝尻 瑞枝, 平田 好則, 西井 準治
    春季第58回応用物理学関係連合講演会 2011年
  • いま求められている次世代光学素子  [通常講演]
    西井 準治
    大阪府立大学工学研究科マテリアル工学分野講演会 2011年
  • 表面プラズモン共鳴による蛍光増強のための回折格子の形状最適化  [通常講演]
    柴田 千尋, 田和 圭子, 金高 健二, 西井 準治
    日本化学会北海道支部2011年夏季研究発表会(室蘭大会) 2011年
  • ビスマスリン酸塩ガラスにおける光学特性への第三成分の影響  [通常講演]
    北村 直之, 福味 幸平, 西井 準治
    2011年秋季第72回応用物理学会学術講演会 2011年
  • 格子状周期構造を用いた高分子ナノシート/CdSeナノ粒子ハイブリッド集積による発光素子の作製  [通常講演]
    森田 晋平, 三ツ石 方也, 宮下 徳治, 田和 圭子, 西井 準治
    2011年秋季第72回応用物理学会学術講演会 2011年
  • 金コートAFMチップとファイバ結合トロイド共振器のカップリング  [通常講演]
    北嶋 千誉, 高島 秀聡, 藤原 英樹, 西井 準治, 笹木 敬司
    2011年秋季第72回応用物理学会学術講演会 2011年
  • カルコゲナイドガラスへのインプリント加工による赤外用ワイヤグリッド偏光子の製作  [通常講演]
    山田 逸成, 山下 直人, 谷 邦彦, 栄西 俊彦, 斉藤 光徳, 福味 幸平, 西井 準治
    2011年秋季第72回応用物理学会学術講演会 2011年
  • 集光型回折格子内装マイクロ流体素子による屈折率センシング  [通常講演]
    西山 宏昭, 西井 準治
    第72回応用物理学会学術講演会 2011年
  • フェムト秒レーザ直接重合による露光部での導波モード生成  [通常講演]
    西山 宏昭, 西井 準治
    第72回応用物理学会学術講演会 2011年
  • Femtosecond laser nonlinear lithography for 3D nanoimprint molds  [通常講演]
    H. Nishiyama, J. Nishii
    The 2nd Japan-China-Korea Joint Conference on MEMS/NEMS 2011年
  • オフアクシス集光型回折格子を内装したマイクロ流体素子による屈折率センシング  [通常講演]
    西山 宏昭, 西井 準治
    第28回「センサ・マイクロマシンと応用システム」シンポジウム 2011年
  • Sensitive Fluorescence Microscopic Observation of Neurons Cultured on a Plasmonic Chip  [通常講演]
    T. Yasui, K. Tawa, C. Hosokawa, J. Nishii, A. Matsumoto
    Nanoimprint and Nanoprint Technology, 2011年
  • Three-dimensional imprint molds fabricated using femtosecond laser nonlinear lithography  [通常講演]
    H. Nishiyama, J. Nishii
    24th International Microprocesses and Nanotechnology Conference 2011年
  • Guiding mode generation of phtooresists using femtosecond laser induced direct polymerization  [通常講演]
    H. Nishiyama, J. Nishii
    The 12th RIES-Hokudai International Symposium 2011年
  • Fabrication of microfluidic devices with off-axis diffraction focusing reflectors  [通常講演]
    H. Nishiyama, J. Nishii
    The 12th RIES-Hokudai International Symposium 2011年
  • 平板モールドプレスによるガラスの変形・離型特性  [通常講演]
    西山 宏昭, 池田 弘, 眞山 博幸, 西井 準治
    第52回ガラスおよびフォトニクス材料討論会 2011年
  • SiO2-based microfluidic devices with off-axis diffractive focusing lenses for refractive index sensing  [通常講演]
    H. Nishiyama, J. Nishii
    The 28th Japan-Korea International Seminar on Ceramics 2011年
  • Imprint process for optical device with periodic structure  [通常講演]
    J. Nishii
    Smart Nano-Micro Materials and Devices(SPIE) 2011年
  • Glass-imprinting for Optical Device Fabrication  [通常講演]
    J. Nishii
    The 1st Japan-China-Korea joint seminar on MEMS/NEMS 2010年
  • Off-axis diffractive focusing reflectors inside microchannels fabricated using femtosecond laser lithography  [通常講演]
    H. Nishiyama, Y. Sagawa, Y. Hirata, J. Nishii
    The 1st Japan-China-Korea joint seminar on MEMS/NEMS 2010年
  • Fluorescence Imaging by Two-Dimensional-Grating-Coupled Surface Plasmon Resonance  [通常講演]
    J. Nishii, K. Kintaka, K. Tawa
    The 27th Korea-Japan International Seminar on Ceramics 2010年
  • Critical temperature of fractal spin system  [通常講演]
    H. Mayama, J. Nishii
    International Symposium of Joint Research Network on Advanced Materials and Devices "Chou" 2010年
  • Young's law, hysteresis and pinning effect in wetting phenomena  [通常講演]
    H. Mayama, J. Nishii
    International Symposium of Joint Research Network on Advanced Materials and Devices "Chou" 2010年
  • 表面ナノ構造を利用した光波制御材料  [通常講演]
    西山 宏昭, 西井 準治
    ナノマクロ物質デバイスシステム創製アライアンス 2010年
  • SiO2 off-axis diffractive focusing reflectors inside microchannels fabricated using nonlinear lithography  [通常講演]
    西山 宏昭, 佐川 雄一, 古川 範大, 平田 好則, 西井 準治
    第27回センサマイクロマシンと応用シンポジウム 2010年
  • Fabrication and integration of nano-structured optical devices for strong photons-molecules coupling fields  [通常講演]
    J. Nishii, K. Kintaka, K. Tawa
    Pacifichem 2010 Congress 2010年
  • Three-dimensional silica surfaces fabricated using femtosecond laser lithography  [通常講演]
    西山 宏昭, 溝尻 瑞枝, 西井 準治, 平田 好則
    Photonics West 2010 2010年
  • フェムト秒レーザ露光による化学増幅型レジストでの特異的な屈折率増加  [通常講演]
    西山 宏昭, 溝尻 瑞枝, 西井 準治, 平田 好則
    第30回レーザー学会 2010年
  • CdSeナノ粒子を含む高分子ナノ集積体からなる微小共振器の発光特性  [通常講演]
    森田 晋平, 三ツ石 方也, 宮下 徳治, 田和 圭子, 西井 準治
    第57回応用物理学関係連合講演会 2010年
  • Molded glass lens with anti-reflective structure  [通常講演]
    T. Tamura, Y. Tanaka, J. Nishii
    International Conference on Optical Design and Fabrication 2010年
  • 高分子ナノシートを用いた微小共振器の発光特性  [通常講演]
    森田 晋平, 三ツ石 方也, 宮下 徳治, 田和 圭子, 西井 準治
    第71回高分子学会年次大会 2010年
  • Glass-imprinting for Optical Device Fabrication  [通常講演]
    J. Nishii
    17th International Symposium on Non-Oxide and New Optical Glasses(XVII ISNOG) 2010年
  • Enhanced emission from CdSe nanoparticle array organized in structurally well-defiend polymer-nanosheet microcavity  [通常講演]
    S. Morita, M. Mitsuishi, T. Miyashita, K. Tawa, J. Nishii
    JSPS/NRF 3rd Joint Seminar for nanomaterials 2010年
  • Glass-imprinting for Optical Device Fabrication  [通常講演]
    J. Nishii
    The 3rd Asian Symposium on Nano Imprint Lithography (ASNIL 2010) 2010年
  • Emission Control of CdSe Nanoparticles Organized with Polymer Nanosheets Assembly  [通常講演]
    S. Morita, M. Mitsuishi, K. Tawa, J. Nishii
    Korea-Japan Joint Forum 2010 2010年
  • 格子基板上に作製した高分子ナノ集積体によるCdSeナノ粒子の発光制御  [通常講演]
    森田 晋平, 三ツ石 方也, 宮下 徳治, 田和 圭子, 西井 準治
    第71回応用物理学会学術講演会 2010年
  • インプリント法による光学素子形成技術  [通常講演]
    西井 準治
    第71回応用物理学会学術講演会シンポジウム(サブ波長表面構造をもつ光学素の最前線) 2010年
  • 高分子ナノ集積体を用いた微小共振器におけるCdSe ナノ 粒子の発光増強  [通常講演]
    森田 晋平, 三ツ石 方也, 宮下 徳治, 田和 圭子, 西井 準治
    高分子ナノ集積体を用いた微小共振器におけるCdSe ナノ 粒子の発光増強 (東北大多元研・産総研・北大電子研) 2010年
  • フェムト秒レーザリソグラフィによる微小流路内へのオフアクシス・グレーティング集光器の形成  [通常講演]
    西山 宏昭, 佐川 雄一, 平田 好則, 西井 準治
    2010年秋季精密工学会 2010年
  • 非線形レーザリソグラフィーによるSiO2立体的表面構造形成  [通常講演]
    西山 宏昭, 光波制御材料, 担当者, 平田 好則, 西井 準治
    日本セラミックス協会北海道東北支部講演会 2010年
  • 回折格子結合型表面プラズモン共鳴場を利用した高感度蛍光検出  [通常講演]
    柴田 千尋, 田和 圭子, 金高 健二, 西井 準治
    回折格子結合型表面プラズモン共鳴場を利用した高感度蛍光検出 2010年
  • Off-axis dffractive focusing reflectors inside microchannels fabricated using femtosecond laser nonlinear lithography  [通常講演]
    H. Nishiyama, Y. sagawa, Y. Hirata, J. Nishii
    23th International Microprocesses and Nanotechnology Conference 2010年
  • Three-dimensional SiO2 surfaces fabricated using nonlinear lithography  [通常講演]
    H. Nishiyama, Y. Hirata, J. Nishii
    3rd International Congress on Ceramics 2010年
  • Glass Imrinting for Highly-functional Optical Devices  [通常講演]
    J. Nishii, H. Hashima, Y. Tanaka
    The 3rd International Congress on Ceramics (ICC3) 2010年
  • Plasmon Enhanced Fluorescence Microscopy using Silver Coated Grating  [通常講演]
    J. Nishii, K. Kintaka, K. Tawa
    The 3rd International Congress on Ceramics (ICC3) Oral 2010年
  • Three-dimensional SiO2 surface structures fabricated using femtosecond laser lithography  [通常講演]
    H. Nishiyama, M. Mizoshiri, Y. Hirata, J. Nishii
    the 27th International Korea-Japan Seminar on Ceramics 2010年
  • SiO2オフアクシス・グレーティング集光器による微小流体の屈折率測定  [通常講演]
    西山 宏昭, 佐川 雄一, 平田 好則, 西井 準治
    第51回ガラスおよびフォトニクス材料討論会 2010年
  • インプリント法によるガラス光学素子の成形  [通常講演]
    西井 準治
    平成21年度 第2回GIC材料技術部会 2009年
  • Three-dimensional surfaces of inorganic materials fabricated by femtosecond laser lithography  [通常講演]
    H. Nishiyama, M. Mizoshiri, J. Nishii, Y. Hirata
    Progress In Electromagnetics Research Symposium 2009年
  • Silica-based optical elements in microchannel fabricated by femtosecond laser lithography assisted micromachining  [通常講演]
    M. Mizoshiri, H. Nishiyama, J. Nishii, Y. Hirata
    The 5th International Congress on Laser Advanced Materials Processing 2009年
  • Three-dimensional surfaces of high-refractive-index materials fabricated by femtosecond laser lithography  [通常講演]
    A. Sugawara, H. Nishiyama, M. Mizoshiri, H. kasa, J. Nishii, Y. Hirata
    the 5th International Congress on Laser Advanced Materials Processing 2009年
  • Femtosecond laser induced nonlinear lithographic properties for micro-optical elements of inorganic materials  [通常講演]
    M. Mizoshiri, H. Nishiyama, J. Nishii, Y. Hirata
    5th Handai Nanoscience and Nanotechnology International Symposium 2009年
  • Fluorescence imaging using grating coupled surface plasmon field  [通常講演]
    J. Nishii, K. Tawa, K. Kintaka
    International Symposium of Postsilicon Materials and Devices Research Alliance Project 2009年
  • 表面プラズモン励起増強 蛍光イメージング  [通常講演]
    西井 準治, 金高 健二, 田和 圭子
    化学者のためのプラズモン講座 ? 光と物質の究極的な相互作用実現に向けて ? 2009年
  • ガラスナノインプリント技術の現状と課題  [通常講演]
    西井 準治
    オプトメカトロニクス協会セミナー 2009年
  • ガラスインプリント法によるサブ波長光学素子の形成  [通常講演]
    西井 準治
    応用物理学会ナノインプリント研究会 2009年
  • ナノ構造を金型で作る  [通常講演]
    西井 準治
    日本光学会光設計研究会 2009年
  • デジタルカメラやブルーレイに使われる最新光学レンズ  [通常講演]
    西井 準治
    関西学院大学シンポジウム 2009年
  • フェムト秒レーザリソグラフィによるマイクロ流路内へのSiO2製微小光学素子の作製  [通常講演]
    溝尻 瑞枝, 西山 宏昭, 西井 準治, 平田 好則
    第29回レーザー学会 2009年
  • 紫外レーザ光照射によるナノ粒子パターニングとその光素子応用  [通常講演]
    西山 宏昭, 平田 好則, 西井 準治
    第2回グローバルCOEシンポジウム 2009年
  • ガラスインプリント用反射防止構造モールドの形状の最適化  [通常講演]
    笠 晴也, 西井 準治, 梅谷 誠, 山田 和宏, 田村 隆正, 田中 康弘
    第70回 応用物理学会学術講演会 2009年
  • フェムト秒レーザリソグラフィにおけるレジスト露光部での屈折率変化  [通常講演]
    溝尻 瑞枝, 西山 宏昭, 西井 準治, 平田 好則
    第70回秋季応用物理学関係連合講演会 2009年
  • ガラスインプリント法による周期構造の形成  [通常講演]
    坂本 太地, 山崎 新, 西井 準治
    日本セラミックス協会 秋期シンポジウム 2009年
  • モールド法によるガラス成型における離型特性の評価  [通常講演]
    大向 啓正, 茶谷原 昭義, 杢野 由明, 西井 準治
    日本セラミックス協会 秋期シンポジウム 2009年
  • ガラス成型による反射防止構造の作製  [通常講演]
    笠 晴也, 梅谷 誠, 山田 和宏, 田村 隆正, 田中 康弘, 西井 準治
    日本セラミックス協会 秋期シンポジウム 2009年
  • Three-dimensional surfaces fabricated using fs laser nonlinear lithography  [通常講演]
    H. Nishiyama, M. Mizoshiri, J. Nishii, Y. Hirata
    35th International Conference on Micro&Nano Engineering 2009年
  • フェムト秒レーザ支援マイクロマシニングによるマイクロ流路内への無機材料製微小光学素子の作製  [通常講演]
    溝尻 瑞枝, 西山 宏昭, 西井 準治, 平田 好則
    第25回「センサ・マイクロマシンと応用システム」シンポジウム 2008年
  • Silica-based diffractive-refractive hybrid lenses fabricated by femtosecond laser lithography  [通常講演]
    H. Nishiyama, J. Nishii, Y. Hirata
    International Conference on Advanced Structural and Functional Materials Design 2008 2008年
  • Periodic porous structures in GeO2-B2O3-SiO2 glass films fabricated using ultraviolet laser pulses  [通常講演]
    H. Nishiyama, J. Nishii, Y. Hirata
    International Conference on Advanced Structural and Functional Materials Design 2008年
  • フェムト秒レーザリソグラフィーによる無機高屈折率材料での微小光学素子形成  [通常講演]
    菅原 晃佳, 西山 宏昭, 溝尻 瑞枝, 西井 準治, 笠 晴也, 平田 好則
    第69回秋季応用物理学関係連合講演会 2008年

その他活動・業績

  • 山田裕也, 岩崎秀, KHURELBAATAR Zagarzusem, JEEM Melbert, 小野円佳, 藤岡正弥, 西井準治 応用物理学会北海道支部/日本光学会北海道支部合同学術講演会講演予稿集 56th-17th (CD-ROM) 2021年
  • 星野海大, 岩崎秀, 森戸春彦, JEEM Melbert, 小野円佳, 藤岡正弥, 西井準治 応用物理学会北海道支部/日本光学会北海道支部合同学術講演会講演予稿集 56th-17th (CD-ROM) 2021年
  • IWASAKI Suguru, MORITO Haruhiko, JEEM Melbert, ONO Madoka, FUJIOKA Masaya, NISHII Junji Abstracts. RIES-Hokudai International Symposium 21st (CD-ROM) 2020年
  • SATO Kento, FUJIOKA Masaya, JEEM Melbert, ONO Madoka, ONO Madoka, NISHII Junji Abstracts. RIES-Hokudai International Symposium 21st (CD-ROM) 2020年
  • 田邊泰人, KHURELBAATAR Zagarzuem, JEEM Melbert, 藤岡正弥, 小野円佳, 西井準治, 小野円佳, 小野円佳, 西井準治 日本セラミックス協会年会講演予稿集(CD-ROM) 2020 2020年
  • 藤岡正弥, 岩崎秀, KHURELBAATAR Zagarzuem, 小峰啓史, 森戸春彦, JEEM Melbert, 小野円佳, 小野円佳, 西井準治 応用物理学会秋季学術講演会講演予稿集(CD-ROM) 81st 2020年
  • 海住英生, 長浜太郎, 北上修, 西井準治, XIAO Gang 日本磁気学会研究会資料 224th 2019年
  • JEEM Melbert, FUJIOKA Masaya, WATANABE Seiichi, NISHII Junji 応用物理学会秋季学術講演会講演予稿集(CD-ROM) 80th 2019年
  • 藤岡正弥, JEEM Melbert, 西井準治 応用物理学会秋季学術講演会講演予稿集(CD-ROM) 80th 2019年
  • REN Yang, REN Yang, FUJIOKA Masaya, JEEM Melbert, KINOSHITA Takuya, FANG Tong, FANG Tong, TANABE Yasuhito, ZHAO Gaoyang, NISHII Junji Abstracts. RIES-Hokudai International Symposium 20th 2019年
  • ナノピラーデバイスを用いたDNAのサイズ分離と無標識検出
    阿尻 大雅, 安井 隆雄, 笠 晴也, 真栄城 正寿, 石田 晃彦, 谷 博文, 西井 準治, 馬場 嘉信, 渡慶次 学 日本分析化学会講演要旨集 67年会 125 -125 2018年08月 [査読無し][通常論文]
  • 藤原英樹, 海住英生, 西井準治, 笹木敬司 応用物理学会春季学術講演会講演予稿集(CD-ROM) 65th ROMBUNNO.20a‐B203‐3 2018年03月05日 [査読無し][通常論文]
  • 山口拓哉, 佃諭志, 小俣孝久, 片岡拓也, 斎藤泰久, 桑原泰隆, 山下弘巳, 石山智大, 西井準治, 山下俊晴, 川副博司 日本セラミックス協会年会講演予稿集(CD-ROM) 2018 2018年
  • 海住英生, 長浜太郎, 佐々木駿, 島田敏宏, 北上修, 三澤貴浩, 藤岡正弥, 西井準治, XIAO Gang 日本物理学会講演概要集(CD-ROM) 73 (1) 2018年
  • 海住英生, 三澤貴浩, 長浜太郎, 小峰啓史, 北上修, 藤岡正弥, 西井準治, XIAO Gang 日本磁気学会学術講演概要集 42nd 2018年
  • 阿尻大雅, 安井隆雄, 安井隆雄, 笠晴也, 真栄城正寿, 石田晃彦, 谷博文, 西井準治, 馬場嘉信, 馬場嘉信, 渡慶次学, 渡慶次学 キャピラリー電気泳動シンポジウム講演要旨集 37th 2017年
  • 海住英生, 長浜太郎, 佐々木駿, 島田敏宏, 北上修, 三澤貴浩, 藤岡正弥, 西井準治, XIAO Gang 日本磁気学会学術講演概要集 41st 2017年
  • 海住英生, 長浜太郎, 北上修, 西井準治, XIAO Gang 日本材料科学会学術講演大会講演予稿集 2017 2017年
  • 山口拓哉, 片岡拓也, 斎藤泰久, 西井準治, 山下俊晴, 川副博司, 石山智大, 山地克彦, 小俣孝久 固体イオニクス討論会講演要旨集 42nd 208‐209 2016年12月05日 [査読無し][通常論文]
  • 三澤貴浩, 森澄人, 小峰啓史, 星野哲久, 芥川智行, 藤岡正弥, 海住英生, 西井準治 応用物理学会秋季学術講演会講演予稿集(CD-ROM) 77th ROMBUNNO.16p‐P6‐21 2016年09月01日 [査読無し][通常論文]
  • 海住英生, 武井将志, 三澤貴浩, 長浜太郎, 西井準治, XIAO Gang 日本磁気学会学術講演概要集 40th 210 2016年08月22日 [査読無し][通常論文]
  • 藤岡正弥, 石丸学, 渋谷泰蔵, 神原陽一, 田畑千紘, 網塚浩, 田中将嗣, 高野義彦, 海住英生, 西井準治 日本物理学会講演概要集(CD-ROM) 71 (1) ROMBUNNO.19ABN‐13 2016年03月22日 [査読無し][通常論文]
  • 三澤貴浩, 森澄人, 笠晴也, 藤岡正弥, 海住英生, 西井準治 応用物理学会春季学術講演会講演予稿集(CD-ROM) 63rd ROMBUNNO.21A-W241-1 2016年03月03日 [査読無し][通常論文]
  • 松本裕介, 的場正憲, 海住英生, 西井準治, HALL Simon R, 神原陽一 応用物理学会春季学術講演会講演予稿集(CD-ROM) 63rd ROMBUNNO.19A-W833-1 2016年03月03日 [査読無し][通常論文]
  • 海住英生, 森澄人, 三澤貴浩, 小峰啓史, 中村晃輔, 藤岡正弥, 西井準治 応用物理学会春季学術講演会講演予稿集(CD-ROM) 63rd ROMBUNNO.19P-P1-22 2016年03月03日 [査読無し][通常論文]
  • 木下拓也, 宮崎篤, 藤岡正弥, 海住英生, 西井準治, 山口拓哉, 小俣孝久 日本セラミックス協会年会講演予稿集(CD-ROM) 2016 ROMBUNNO.3K01 2016年03月01日 [査読無し][通常論文]
  • 本庄周作, 横野示寛, 有田正志, 福地厚, 海住英生, 西井準治, 高橋庸夫 応用物理学会北海道支部・日本光学会北海道地区合同学術講演会講演予稿集 51st-12th 28 2016年01月09日 [査読無し][通常論文]
  • 森澄人, 三澤貴浩, 笠晴也, 中村晃輔, 海住英生, 西井準治 応用物理学会北海道支部・日本光学会北海道地区合同学術講演会講演予稿集 51st-12th 23 2016年01月09日 [査読無し][通常論文]
  • 西井 準治, 田和 圭子, 三ツ石 方也 電子情報通信学会総合大会講演論文集 2015 (2) "SS -78"-"SS-79" 2015年02月24日 [査読無し][通常論文]
  • 本庄周作, 横野示寛, 有田正志, 福地厚, 海住英生, 西井準治, 高橋庸夫 日本磁気学会学術講演概要集 39th 2015年
  • 田和圭子, 藤田剛, 細川千絵, 西井準治 高分子学会予稿集(CD-ROM) 64 (1) 2015年
  • 印藤健也, 森田晋平, 山本俊介, 田和圭子, 西井準治, 宮下徳治, 三ツ石方也 高分子学会予稿集(CD-ROM) 63 (1) ROMBUNNO.1PF090 2014年05月09日 [査読無し][通常論文]
  • 藤田剛, 藤田剛, 細川千絵, 西井準治, 柿沼憲宏, 尾池真, 田和圭子, 田和圭子 高分子学会予稿集(CD-ROM) 63 (1) 2014年
  • INDO Kenya, MORITA Simpei, YAMAMOTO Shunsuke, MITSUISHI Masaya, MIYASHITA Tokuji, TAWA Keiko, NISHII Junji 化学系学協会東北大会プログラムおよび講演予稿集 2013 304 2013年09月28日 [査読無し][通常論文]
  • 石山智大, 鈴木翔悟, 西井準治, 山下俊晴, 川副博司, 小俣孝久 電気化学秋季大会講演要旨集 2013 142 2013年09月27日 [査読無し][通常論文]
  • 石山智大, 鈴木翔悟, 西井準治, 山下俊晴, 川副博司, 小俣孝久 電気化学秋季大会講演要旨集 2013 142 2013年09月27日 [査読無し][通常論文]
  • 小俣孝久, 石山智大, 鈴木翔悟, 西井準治, 山下俊晴, 川副博司 電気化学秋季大会講演要旨集 2013 141 2013年09月27日 [査読無し][通常論文]
  • 池田弘, 酒井大輔, 原田建治, 秋葉周作, 鈴木俊夫, 西井準治 電気化学秋季大会講演要旨集 2013 62 2013年09月27日 [査読無し][通常論文]
  • 印藤健也, 森田晋平, 山本俊介, 田和圭子, 西井準治, 三ツ石方也, 宮下徳治 応用物理学会秋季学術講演会講演予稿集(CD-ROM) 74th ROMBUNNO.19P-C4-6 2013年08月31日 [査読無し][通常論文]
  • 生田目直季, 池田弘, 酒井大輔, 原田建治, 秋葉周作, 鈴木俊夫, 西井準治 応用物理学会秋季学術講演会講演予稿集(CD-ROM) 74th ROMBUNNO.19P-A13-6 2013年08月31日 [査読無し][通常論文]
  • 酒井大輔, 池田弘, 原田建治, 原悠一郎, 山本清, 山本雄一, 西井準治 応用物理学会秋季学術講演会講演予稿集(CD-ROM) 74th ROMBUNNO.18P-C13-7 2013年08月31日 [査読無し][通常論文]
  • 川口慶雅, 池田弘, 酒井大輔, 原田建治, 秋葉周作, 鈴木俊夫, 西井準治 応用物理学会秋季学術講演会講演予稿集(CD-ROM) 74th ROMBUNNO.19A-A2-2 2013年08月31日 [査読無し][通常論文]
  • 藤田剛, 藤田剛, 細川千絵, 西井準治, 田和圭子, 田和圭子 高分子学会予稿集(CD-ROM) 62 (2) ROMBUNNO.2PA111 2013年08月28日 [査読無し][通常論文]
  • 印藤健也, 森田晋平, 山本俊介, 田和圭子, 西井準治, 三ツ石方也, 宮下徳治 高分子学会予稿集(CD-ROM) 62 (2) ROMBUNNO.2R06 2013年08月28日 [査読無し][通常論文]
  • 藤田剛, 藤田剛, 安井力, 安井力, 細川千絵, 西井準治, 青田浩幸, 田和圭子, 田和圭子 高分子学会予稿集(CD-ROM) 62 (1) 2013年
  • 田和圭子, 安井力, 細川千絵, 西井準治, 青田浩幸 関西大学先端科学技術シンポジウム講演集 16th 2012年
  • 柴田千尋, 田和圭子, 金高健二, 西井準治 日本化学会北海道支部夏季研究発表会講演要旨集 2011 141 2011年07月01日 [査読無し][通常論文]
  • 西井準治, 柴田千尋, 田和圭子, 金高健二 応用物理学関係連合講演会講演予稿集(CD-ROM) 58th ROMBUNNO.25P-BJ-3 2011年03月09日 [査読無し][通常論文]
  • 田中 康弘, 田村 隆正, 西井 準治 光学 40 (1) 30 -32 2011年01月10日 [査読無し][通常論文]
  • 西井 準治 New glass 25 (2) 7 -10 2010年06月 [査読無し][通常論文]
  • 野宮 佑介, 小林 直人, 若杉 隆, 西井 準治, 角野 広平 材料 59 (6) 423 -429 2010年06月 [査読無し][通常論文]
     
    It has been reported that a sub-wavelength structure can be formed at the surface of glass, into which silver ions are incorporated through ion-exchange, by means of imprint molding at a lower temperature than softening temperature of the glass. In order to apply this technique to practical glass systems used in mold processing, we investigated ion-exchange behaviors, variation in softening temperature and optical transmission spectra after the ion-exchange and post-heat-treatment for various kinds of glasses. The results were discussed from the viewpoint of the glass composition and struct...
  • 田和圭子, CUI Xiaoqiang, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集(CD-ROM) 57th ROMBUNNO.17P-ZF-6 2010年03月03日 [査読無し][通常論文]
  • 西井準治, 金高健二, 田和圭子 応用物理学関係連合講演会講演予稿集(CD-ROM) 57th ROMBUNNO.17P-ZL-4 2010年03月03日 [査読無し][通常論文]
  • 西井 準治 工業材料 58 (3) 29 -32 2010年03月 [査読無し][通常論文]
  • 荒木剛, 西島喜明, 村澤尚樹, 上野貢生, 上野貢生, 西井準治, 三澤弘明 応用物理学関係連合講演会講演予稿集(CD-ROM) 57th 2010年
  • 蝦名渉, 西島喜明, MIZEIKIS Vygantas, 上野貢生, 西井準治, 三澤弘明 日本化学会講演予稿集 90th (3) 2010年
  • 荒木剛, 村澤尚樹, 上野貢生, 横田幸恵, 西島喜明, 西井準治, 三澤弘明 日本化学会講演予稿集 90th (3) 2010年
  • 治田将, 三澤弘明, 上野貢生, 横田幸恵, 西井準治, 田和圭子, 奥津哲夫, 奥津哲夫 光化学討論会講演要旨集 2010 2010年
  • 治田将, 三澤弘明, 上野貢生, 西井準治, 横田幸恵, 山下卓勇, 奥津哲夫 日本化学会講演予稿集 90th (2) 2010年
  • 金高健二, CUI Xiaoqiang, 堀博伸, 田和圭子, 西井準治 Optics & Photonics Japan講演予稿集 2009 146 -147 2009年11月24日 [査読無し][通常論文]
  • 西井準治, 金高健二, 田和圭子 化学工業 60 (10) 794 -800 2009年10月01日 [査読無し][通常論文]
  • Hiroaki Nishiyama, Junji Nishii, Mizue Mizoshiri, Yoshinori Hirata APPLIED SURFACE SCIENCE 255 (24) 9750 -9753 2009年09月 [査読無し][通常論文]
     
    Microlens arrays of high-refractive-index glass GeO(2)-SiO(2) were fabricated by femtosecond laser lithography assisted micromachining. GeO(2)-SiO(2) thin glass films, which were deposited by plasma-enhanced chemical vapor deposition, have a refractive index of 1.4902 and exhibit high transparency at wavelengths longer than 320 nm. Using a femtosecond laser, three-dimensional patterns were written inside resists on GeO(2)-SiO(2) films, and then the patterns were transferred to the underlying films by CHF(3) and O(2) plasma treatments. This combined process enabled us to obtain uniform microlens structures with a diameter of 38 mu m. The heights of the transferred lenses were approximately one-quarter the height of the resist patterns, due to differences in the plasma etching rates between GeO(2)-SiO(2) and the resist. The lens surfaces were smooth. When 632.8-nm-wavelength He-Ne laser light was normally coupled to the lenses, focal spots with a diameter of 3.0 mm were uniformly observed. The combined process was effective in fabricating three-dimensional surfaces of inorganic optical materials. (C) 2009 Elsevier B.V. All rights reserved.
  • 田和圭子, 堀博伸, 達吉郎, 西井準治, 金高健二, 清末和之 産総研TODAY 9 (9) 6 2009年09月01日 [査読無し][通常論文]
  • 西井 準治, 田中 康弘, 波多野 卓史 應用物理 78 (7) 655 -658 2009年07月10日 [査読無し][通常論文]
  • 堀博伸, 田和圭子, 金高健二, 達吉郎, 西井準治 応用物理学関係連合講演会講演予稿集 56th (3) 1398 2009年03月30日 [査読無し][通常論文]
  • 粟津英行, 金高健二, 西尾謙三, 粟辻安浩, 裏升吾, 西井準治 応用物理学関係連合講演会講演予稿集 56th (3) 1027 2009年03月30日 [査読無し][通常論文]
  • 堀博伸, 田和圭子, 金高健二, 西井準治, 達吉郎 日本化学会講演予稿集 89th (2) 1540 2009年03月13日 [査読無し][通常論文]
  • 粟津英行, 金高健二, 西尾謙三, 粟辻安浩, 裏升吾, 西井準治 電気学会電磁界理論研究会資料 EMT-09 (1-5.7-10.13-21) 1 -6 2009年01月29日 [査読無し][通常論文]
  • Keiko Tawa, Hironobu Hori, Yoshiro Tatsu, Junji Nishii, Kenji Kintaka, Kazuyuki Kiyosue AIST Today (International Edition) (34) 9 -10 2009年 
    A study was conducted to demonstrate fluorescent microscopic imaging using a substrate with a sub-wavelength grating. Enhanced fluorescence detection was carried out using grating-coupled (GC)-surface plasmon resonance (SPR) to overcome the challenges associated with conventional prism coupled SPR-design. A thin metal coated grating substrate with a rectangular or trapezoidal surface profile in GC-SPR allowed the resonance angle to be reduced. The periodic structure was fabricated using two-beam interference and dry etching or UV-nanoprint lithography. It was also demonstrated that a periodical structure of 400 nm created on the substrate surface was covered with Ag and SiO layers to be used as a chip. 2
  • 田和圭子, 西澤祐次, 西澤祐次, 堀博伸, 西井準治, 中沖隆彦 高分子学会予稿集(CD-ROM) 58 (2 Disk1) 2009年
  • 田和圭子, 西澤祐次, 堀博伸, 西井準治, 中沖隆彦 高分子学会予稿集(CD-ROM) 58 (1 Disk1) 2009年
  • 明石直子, 田和圭子, 達吉郎, 金高健二, 西井準治 応用物理学会学術講演会講演予稿集 69th (2) 616 2008年09月02日 [査読無し][通常論文]
  • 山田 和宏, 森 登史晴, 笠 晴也, 西井 準治 精密工学会誌 74 (8) 785 -788 2008年08月05日 [査読無し][通常論文]
  • 笠晴也, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 55th (3) 1030 2008年03月27日 [査読無し][通常論文]
  • 田和圭子, 堀博伸, 金高健二, 清末和之, 明石直子, 達吉郎, 西井準治 応用物理学関係連合講演会講演予稿集 55th (0) 19 2008年03月27日 [査読無し][通常論文]
  • 裏升吾, 金高健二, 粟津英行, 西尾謙三, 粟辻安浩, 西井準治 応用物理学関係連合講演会講演予稿集 55th (3) 1036 2008年03月27日 [査読無し][通常論文]
  • 森登史晴, 長谷川研人, 波多野卓史, 笠晴也, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 55th (3) 1037 2008年03月27日 [査読無し][通常論文]
  • 堀博伸, 田和圭子, 金高健二, 西井準治, 達吉郎 日本化学会講演予稿集 88th (1) 383 2008年03月12日 [査読無し][通常論文]
  • 笠晴也, 金高健二, 西井準治 日本化学会講演予稿集 88th (1) 644 2008年03月12日 [査読無し][通常論文]
  • 西井準治, 田和圭子, 金高健二 日本化学会講演予稿集 88th (1) 780 2008年03月12日 [査読無し][通常論文]
  • 笠晴也, 西井準治, 森登史晴, 波多野卓史, 木元慶久, 平井義彦 精密工学会大会学術講演会講演論文集 2008 2008年
  • 笠晴也, 金高健二, 西井準治 ガラスおよびフォトニクス材料討論会講演要旨集 48th 104 -105 2007年11月29日 [査読無し][通常論文]
  • 金高健二, 西井準治, 山口智史, 裏升吾 電子情報通信学会論文誌 C J90-C (11) 767 -774 2007年11月01日 [査読無し][通常論文]
  • 西井 準治 ITUジャーナル 37 (10) 17 -19 2007年10月 [査読無し][通常論文]
  • 山田逸成, 金高健二, 西井準治, 斉藤光徳 応用物理学会学術講演会講演予稿集 68th (3) 1001 2007年09月04日 [査読無し][通常論文]
  • 金高健二, 西井準治, 篠田浩司, 伊藤宝, 仁井大輔, 西尾謙三, 裏升吾 応用物理学会学術講演会講演予稿集 68th (3) 1197 2007年09月04日 [査読無し][通常論文]
  • 笠晴也, 金高健二, 西井準治, 森登史晴, 長谷川研人, 波多野卓史 応用物理学会学術講演会講演予稿集 68th (3) 1006 2007年09月04日 [査読無し][通常論文]
  • 森登史晴, 波多野卓史, 笠晴也, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 54th (3) 1052 2007年03月27日 [査読無し][通常論文]
  • 金高健二, 西井準治, 山口智史, 裏升吾 応用物理学関係連合講演会講演予稿集 54th (0) 49 2007年03月27日 [査読無し][通常論文]
  • 山田逸成, 金高健二, 西井準治, 斉藤光徳 応用物理学関係連合講演会講演予稿集 54th (3) 1048 2007年03月27日 [査読無し][通常論文]
  • 笠晴也, 金高健二, 西井準治, 森登史晴, 波多野卓史 応用物理学関係連合講演会講演予稿集 54th (2) 955 2007年03月27日 [査読無し][通常論文]
  • 金高健二, 西井準治, 山口智史, 小林貴之, 裏升吾 エレクトロニクス実装学会講演大会講演論文集 21st 65 -66 2007年02月26日 [査読無し][通常論文]
  • Kageyama Junichi, Kintaka Kenji, Nishii Junji 旭硝子研究報告 57 163 -166 2007年
  • Kenji Kintaka, Junji Nishii, Kouji Shinoda, Shogo Ura IEEE PHOTONICS TECHNOLOGY LETTERS 18 (21-24) 2299 -2301 2006年11月 [査読無し][通常論文]
     
    Wavelength-division-multiplexing (WDM) optical interconnection was investigated for future on-board system integration. Free-space-wave add-drop multiplexers consisting of focusing grating couplers and distributed Bragg reflectors were designed and integrated for two-channel WDM parallel signal transmission in a thin-film waveguide. Signal wavelengths were 857 and 852 nm, and each channel length was 15 mm. Insertion loss was 17 dB for each channel, and the maximum crosstalk noise was -11 dB. WDM parallel signal transmission of 1.0 Gb/s per channel was demonstrated.
  • Kazuaki Oya, Tatsuhiro Nakazawa, Shigeo Kittaka, Keiji Tsunetomo, Kenji Kintaka, Junji Nishii, Kazuyuki Hirao JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS 45 (37-41) L1001 -L1003 2006年10月 [査読無し][通常論文]
     
    We first embedded a triangular one-dimensional photonic crystal in a slab waveguide of a Ta2O5 core with SiO2 cladding. The change in the output angle was 4.8 degrees with the incident wavelength change of 1% for wavelengths of 1400-1500 nm. This value was 1.7 times larger than that of our previous photonic crystal with a SiO2 core. In addition, the maximum diffraction efficiency of 25% was achieved, which was a considerable improvement over the efficiency of our previous one.
  • 笠晴也, 金高健二, 西井準治 日本セラミックス協会秋季シンポジウム講演予稿集 19th 106 2006年09月19日 [査読無し][通常論文]
  • 笠晴也, 金高健二, 西井準治 応用物理学会学術講演会講演予稿集 67th (2) 817 2006年08月29日 [査読無し][通常論文]
  • Wataru Watanabe, Seiji Sowa, Takayuki Tamaki, Kazuyoshi Itoh, Junji Nishii JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS 45 (29-32) L765 -L767 2006年08月 [査読無し][通常論文]
     
    Three-dimensional waveguides are fabricated in poly(methyl methacrylate) (PMMA) by use of femtosecond pulses from a Ti: sapphire amplifier. Waveguides can be fabricated at depths of similar to 1 nun inside a bulk PMMA, demonstrating the capability of micromachining in three-dimension. The realization of three-dimensional directional couplers is demonstrated. Observations of time-lapse cross-sectional images show the distribution of refractive index change gradually vary after irradiation of laser pulses. After the fabrication of the waveguide, refractive index in central region of the waveguide decreased. After 20 min, the symmetrical waveguide with positive refractive index change was formed.
  • Takayuki Tamaki, Wataru Watanabe, Hiroyuki Nagai, Makoto Yoshida, Junji Nishii, Kazuyoshi Itoh OPTICS EXPRESS 14 (15) 6971 -6980 2006年07月 [査読無し][通常論文]
     
    We report on structural modification in fused silica by a novel commercial femtosecond fiber laser with a fundamental wavelength of 1558 nm. The refractive- index change was induced by laser pulses at a repetition rate of 173 kHz and pulse duration of 870 fs. The refractive index change with a magnitude of 1.2 x 10(-3) was estimated from the diffraction efficiencies of an internal grating. (c) 2006 Optical Society of America.
  • Wataru Watanabe, Satoshi Onda, Takayuki Tamaki, Kazuyoshi Itoh, Junji Nishii APPLIED PHYSICS LETTERS 89 (2) 021106- 2006年07月 [査読無し][通常論文]
     
    We report on the joining of dissimilar transparent materials based on localized melting and resolidification of the materials only around the focal volume due to nonlinear absorption of focused femtosecond laser pulses. We demonstrate the joining of borosilicate glass and fused silica, whose coefficients of thermal expansion are different. The joint strength and the transmittance through joint volume were investigated by varying the translation velocity of the sample and the pulse energy of the irradiated laser pulses. (c) 2006 American Institute of Physics.
  • A Saitoh, S Matsuishi, SW Choi, J Nishii, M Oto, M Hirano, H Hosono JOURNAL OF PHYSICAL CHEMISTRY B 110 (15) 7617 -7620 2006年04月 [査読無し][通常論文]
     
    The codoping effect mechanism of Al and P on the solubility enhancement of Er3+ ion in SiO2 glass was clarified by electron spin-echo envelope modulation spectroscopy. It turned out that doped P ions preferentially coordinate to the Er3+ ion to form a "solvation shell structure", and the environment is similar to that in phosphate glass, while doped Al ions do not form such a selective solvation structure, taking octahedral coordination. This striking difference indicates that the primary roles of the P-doping and the M-doping are attributed to "enthalpy of mixing" and to "entropy of mixing", respectively.
  • N Kitamura, K Fukumi, J Nishii JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 45 (3A) 1725 -1728 2006年03月 [査読無し][通常論文]
     
    Surface modification was performed oil high-pressure densified silica glass by CO laser irradiation. Microbumps were formed oil the silica glass Surface due to the relaxation of the compacted structure by the irradiation. The relaxed area reached a depth of about 40 mu m, and the Volume expansion estimated from the relaxed area was consistent with the volume expansion at the surface. The microbumps were arrayed at a minimum interval of 15 mu m, which acted as a microlens array. Moreover, microbumps were formed successfully on both sides of the thin glass plate by irradiation from one side.
  • 笠晴也, 秋田陽介, 金高健二, 福味幸平, 西井準治, 平尾一之 セラミックス基礎科学討論会講演要旨集 44th 258 -259 2006年01月19日 [査読無し][通常論文]
  • L. Chen, K. Kintaka, H. Nishimura, K. Fukumi, J. Nishii, K. Hirao Proceedings of SPIE - The International Society for Optical Engineering 6149 2006年 [査読有り][通常論文]
     
    A hydrofluoric acid (HF) bonding method has been applied for the thin film filters integration. The quality of bonding was examined by the evaluation of bonding strength and the observation of bonding interface. The bonding strength depends on the applied pressure and temperature during bonding. The maximum bonding strength was more than 10 MPa. High quality bonding interface was observed by scanning electron microscope and transmission electron microscope. A color filer array of red, green and blue (RGB) was designed to separate the white light. The filters were integrated into a glass body successfully by HF bonding. Its transmittance spectra were unchanged after heating at 450° C for 20 hours. In addition, integration of filters was carried out to fabricate an optical demutiplexer for coarse wavelength division multiplexing system. It was confirmed that the integrated filter array acted as a demutiplexer.
  • Surface and Inner Modification of Densified Silica Glass by Infrared Laser Irradiation
    Proceedings of 6th Pacific Rim Conference on Ceramics and Glass Technology 2006年 [査読無し][通常論文]
  • 西井 準治 ニュ-ガラス 21 (1) 69 -71 2006年 [査読無し][通常論文]
  • 西井 準治 ニュ-ガラス 21 (4) 61 -63 2006年 [査読無し][通常論文]
  • 北村 直之, 福味 幸平, 西井 準治 ニュ-ガラス 21 (2) 25 -30 2006年 [査読無し][通常論文]
  • 北村 直之, 福味 幸平, 西井 準治 東北大学金属材料研究所強磁場超伝導材料研究センター年次報告 2006 (0) 173 -175 2006年 [査読無し][通常論文]
  • 永金 知浩, 姫井 裕助, 北村 直之, 西井 準治, 福味 幸平, 坂本 明彦, 平尾 一之 日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi 114 (1326) 180 -183 2006年 [査読無し][通常論文]
     
    The optical property of Li_2O-Al_2O_3-SiO_2 glass-ceramic, with a near-zero thermal expansion coefficient, crystallized under high pressure has been studied. A hydrostatic pressure of 196 MPa was applied by a hot isostatic pressing (HIP) technique during the nucleation process and the crystal growth process. The temperature coefficient of the optical path length, 1/l・dS/dT, decreased by 0.6×10^<-6>K^<-1>, because the temperature coefficient of the refractive index, dn/dT, was decreased by the HIP treatment. The decrease in dn/dT was ascribed to the suppression of the temperature coefficient...
  • S Sowa, W Watanabe, J Nishii, K Itoh APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING 81 (8) 1587 -1590 2005年12月 [査読無し][通常論文]
     
    A single femtosecond laser pulse creates a filamentary structural change along the optical axis inside bulk poly(methyl methacrylate). The filamentary structural change was revealed to be a cylindrical cavity based on scanning electron microscope examination, the presence of capillary action, and analysis of diffraction by an embedded diffraction grating. The cavity had a diameter of 0.8 mu m and a length of 125 mu m.
  • S Onda, W Watanabe, K Yamada, K Itoh, J Nishii JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 22 (11) 2437 -2443 2005年11月 [査読無し][通常論文]
     
    Different filamentary tracks in synthesized silica were induced by varying both the pulse duration and the incident energy of chirped laser pulses under slow-focusing conditions. Short-duration pulses induced filamentary refractive-index change, whereas longer pulses produced scattering damage in filamentary tracks. We report a systematic study on the morphology and birefringence of filamentary refractive-index change and scattering damage. (c) 2005 Optical Society of America.
  • Y Iga, W Watanabe, YD Li, L Yan, J Nishii, K Itoh JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 44 (11) 8013 -8015 2005年11月 [査読無し][通常論文]
     
    We report on the generation of debris in the femtosecond laser drilling of silica glass in water. The morphology of the debris ejected from the amorphous synthesized silica is examined by scanning electron microscopy and the chemical structures are investigated by X-ray diffraction analysis and Fourier transform infrared spectroscopy.
  • 笠晴也, 秋田陽介, 金高健二, 西井準治, 福味幸平, 平尾一之 応用物理学会学術講演会講演予稿集 66th (2) 769 2005年09月07日 [査読無し][通常論文]
  • YD Li, W Watanabe, T Tamaki, J Nishii, K Itoh JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 44 (7A) 5014 -5016 2005年07月 [査読無し][通常論文]
     
    The Dammann grating is one kind of useful binary optical elements. We fabricated a single-layer birefringence-free 5 x 5 Dammann grating in silica glass using the filamentation of 800 nm femtosecond laser pulses. The diffraction efficiency of the Dammann grating reached 56%, which is close to the theoretical value of 77%.
  • 大家和晃, 中沢達洋, 橘高重雄, 常友啓司, 金高健二, 西井準治, 平尾一之 応用物理学関係連合講演会講演予稿集 52nd (3) 1116 2005年03月29日 [査読無し][通常論文]
  • 西山宏昭, 宮本勇, 平田好則, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 52nd (2) 1010 2005年03月29日 [査読無し][通常論文]
  • 坂本 明彦, 西井 準治, 浅野 秀樹, 和田 正紀, 竹内 宏和 電子情報通信学会総合大会講演論文集 2005 (1) 216 -216 2005年03月07日
  • 秋田陽介, 笠晴也, 陰山淳一, 金高健二, 福味幸平, 西井準治, 平尾一之 セラミックス基礎科学討論会講演要旨集 43rd 190 -191 2005年01月20日 [査読無し][通常論文]
  • Fumio Sato, Akihiko Sakamoto, Shigeru Yamamoto, Kenji Kintaka, Junji Nishii Journal of the Ceramic Society of Japan 113 (1317) 373 -375 2005年 [査読無し][通常論文]
     
    We have fabricated a photonic crystal rod (PCR), which is a novel optical connecting component with a two-dimensional photonic crystal structure, by drawing a preform made of a multicomponent alkali-borosilicate glass. A hot vacuum (725°C, 10 hPa) stacking method was developed for the fabrication of the preform, which enables self-organization of the inner structure of the preform. PCRs with sub-micrometer dimensional accuracy were successfully fabricated by drawing the preform at 820 C, which is a much lower temperature than that used for the drawing of silica glass. The PCRs showed single-mode optical propagation at both wavelengths of 633 and 1550 nm with mode field diameters (MFDs) of 23.1 and 33.4 μm, respectively. The bending strength of the PCR reached 850 MPa after ion-exchange treatment. PCR is expected to be a candidate for precision, high-strength, endlessly single-mode novel optical connecting components with large MFDs.
  • Y Himei, T Nagakane, A Sakamoto, N Kitamura, K Fukumi, J Nishii, K Hirao Optical Components and Materials II 5723 71 -78 2005年 [査読無し][通常論文]
     
    An attempt has been conducted to develop multicomponent transparent glass-ceramics which have athermal property PP better than silica glass. Transparent Li2O-Al2O3-SiO2 (LAS) glass-ceramics with small thermal expansion coefficient was chosen as a candidate. Athermal property of the glass-ceramics was improved by the independent control of temperature coefficients of electronic polarizability (phi) and thermal expansion coefficient (alpha), both of which govern the temperature coefficient of optical path length. It was found that alpha and phi of the LAS glass-ceramics were controllable by the additives and crystallization conditions. The doping of B2O3 and the crystallization under a hydrostatic pressure of 196 MPa were very effective to reduce 0 without a remarkable increase in a. It was deduced that the reduction in 0 by the crystallization under 196 MPa resulted from the inhibition of the precipitation of beta-spodumene solid solution. The relative temperature coefficients of optical path length of B2O3-doped glass-ceramic crystallized under 196 MPa was 11.7 x 10(-6)/degrees C, which was slightly larger than that of silica glass. Nevertheless, the a value of this lass-ceramic was smaller than that of silica glass.
  • K Oya, T Nakazawa, S Kittaka, K Tsunetomo, K Kintaka, J Nishii, K Hirao OPTICS LETTERS 30 (2) 192 -194 2005年01月 [査読無し][通常論文]
     
    Silica-based one-dimensional photonic crystal (1D-PC) is fabricated by use of a high-spatial-frequency grating with input and output surfaces tilted with respect to its periodic direction. An incident beam is coupled with the first photonic band in the second Brillouin zone of the 1D-PC. The output beam angle changes 3degrees with a wavelength change of 1%. A prototype of an ultrasmall demultiplexer is demonstrated by use of a silica slab waveguide with 1D-PC. (C) 2005 Optical Society of America.
  • 西山宏昭, 宮本勇, 金高健二, 西井準治 ガラスおよびフォトニクス材料討論会講演要旨集 45th 6 -7 2004年11月25日 [査読無し][通常論文]
  • K Kintaka, J Nishii, T Matano, A Sakamoto JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS 43 (10A) L1315 -L1317 2004年10月 [査読無し][通常論文]
     
    A boron and fluorine doped SiO2 slab waveguide with a surface-relief Bragg grating of 0.53 mum period was fabricated on a crystallized glass substrate with a thermal expansion coefficient of -2.8 x 10(-6)/degreesC by plasma-enhanced chemical vapor deposition. A thermal shift of the Bragg wavelength as low as 3 pm/degreesC was obtained for TE0 mode in a 13B(2)O(3)-87SiO(2) (mol %) core and 3F(2)-11B(2)O(3)-86SiO(2) (mol %) cladding waveguide, which was about one-fourth of the value obtained for a conventional Ge-SiO2 waveguide. The polarization dependence of the temperature sensitivity of the Bragg wavelength was theoretically analyzed.
  • 秋田陽介, 陰山淳一, 金高健二, 西井準治, 平尾一之 日本セラミックス協会秋季シンポジウム講演予稿集 17th 187 2004年09月17日 [査読無し][通常論文]
  • 金高健二, 西井準治, 俣野高宏, 坂本明彦 応用物理学会学術講演会講演予稿集 65th (3) 1040 2004年09月01日 [査読無し][通常論文]
  • K Yamada, W Watanabe, YD Li, K Itoh, J Nishii OPTICS LETTERS 29 (16) 1846 -1848 2004年08月 [査読無し][通常論文]
     
    Multilevel phase-type diffractive lenses were fabricated by translating a filament of a femtosecond laser pulse into three-dimensional space inside synthesized silica. The profile of the lenses was designed by use of a multilevel approximation to a kinoform lens. Two-level diffractive lenses with multiple layers along the optical axis provided a maximum efficiency of 37.6% at a wavelength of 632.8 nm. A four-level diffractive lens provided a maximum efficiency of 56.9%. The lenses fabricated with filamentation were free from birefringence. (C) 2004 Optical Society of America.
  • Y Iga, T Ishizuka, W Watanabe, K Itoh, Y Li, J Nishii JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 43 (7A) 4207 -4211 2004年07月 [査読無し][通常論文]
     
    Femtosecond laser pulses are used to drill high-aspect-ratio microchannels from the rear surface of silica glass, which is in contact with water. The relationship between the diameter of the channel and the incident energy of laser pulses is investigated. The diameter of the channel was varied from 2 pm to 50 pm by increasing the energy. The morphology of the entrance and inner walls of the channels was analyzed by scanning electron microscopy. The capillary phenomena in the dead-end microchannels in contact with water are investigated. The realization of circular three-dimensional channels is demonstrated.
  • K Kintaka, J Nishii, J Ohmori, Y Imaoka, M Nishihara, S Ura, R Satoh, H Nishihara OPTICS EXPRESS 12 (14) 3072 -3078 2004年07月 [査読無し][通常論文]
     
    Optical waveguide demultiplexer was designed and fabricated by integration of two types of gratings, namely, guided-mode-selective focusing grating couplers (GMS-FGCs) and different-guided-mode-coupling distributed Bragg reflectors (DGM-DBRs) in a slab waveguide for constructing a wavelength-division-multiplexing chip-to-chip optical interconnecting board. In the waveguide demultiplexer, guided signal waves were separated wavelength-selectively by DGM-DBRs, and coupled out by GMS-FGCs to focused free space waves. Two-channel demultiplexing with 5-nm-wavelength spacing was demonstrated at around 850-nm wavelength. (C) 2004 Optical Society of America.
  • T Nakazawa, S Kittaka, K Tsunetomo, K Kintaka, J Nishii, K Hirao OPTICS LETTERS 29 (11) 1188 -1190 2004年06月 [査読無し][通常論文]
     
    A compact and monolithic four-channel demultiplexer with 20-nm spacing was fabricated by use of a high-spatial-frequency transmission grating buried in a silica waveguide. The grating was successfully buried in a silica slab waveguide by overcladding by plasma-enhanced chemical-vapor deposition. The device's size was approximately 5.1 mm x 9.2 mm. The average insertion loss was 13 dB. The average cross talk was -15 dB for adjacent channels and -19 dB for nonadjacent channels. The polarization-dependent loss was estimated to be as low as 0.7 dB. (C) 2004 Optical Society of America.
  • 西山宏昭, 宮本勇, 松本慎一, 斉藤光徳, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 51st (3) 1335 2004年03月28日 [査読無し][通常論文]
  • 陰山淳一, 金高健二, 西井準治, 平尾一之 応用物理学関係連合講演会講演予稿集 51st (2) 998 2004年03月28日 [査読無し][通常論文]
  • 松本慎一, 斉藤光徳, 西山宏昭, 宮本勇, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 51st (2) 984 2004年03月28日 [査読無し][通常論文]
  • 大家和晃, 中沢達洋, 橘高重雄, 常友啓司, 金高健二, 西井準治, 平尾一之 応用物理学関係連合講演会講演予稿集 51st (3) 1089 2004年03月28日 [査読無し][通常論文]
  • 大家和晃, 中沢達洋, 橘高重雄, 常友啓司, 金高健二, 西井準治, 平尾一之 電子情報通信学会技術研究報告 103 (667(OPE2003 270-284)) 13 -16 2004年02月20日 [査読無し][通常論文]
     
    我々は、CWDMネットワーク用分波素子として、石英導波路に埋め込まれた高い空間周波数を持った透過型回折格子を検討した。光信号は、第1の凹面ミラーによってコリメートされて回折格子へ入射し、波長ごとに異なる角度に回折した後に第2の凹面ミラーによって出力チャネル導波路上に集光され、波長ごとに出力される。これら全ての光コンポーネントは9.2×5.1mmサイズの石英基板上に集積できた。隣接クロストーク、挿入損失はそれぞれ-14dB,14dBであった。偏波依存損失は0.7dB以下であった。
  • 西山宏昭, 宮本勇, 金高健二, 西井準治 Symp Microjoining Assem Technol Electron 10th 393 -398 2004年02月05日 [査読無し][通常論文]
  • K Kintaka, J Nishii, Y Imaoka, J Ohmori, S Ura, R Satoh, H Nishihara IEEE PHOTONICS TECHNOLOGY LETTERS 16 (2) 512 -514 2004年02月 [査読無し][通常論文]
     
    Guided-mode-selective focusing grating coupler, which couples out not TE0 mode but TE1 mode to a free space wave,,was designed at around 850-nm wavelength for constructing a wavelength-division-multiplexing chip-to-chip optical interconnection board. The coupler was fabricated in a slab waveguide consisting of a Ge-SiO2 main-guiding core, a SiO2 subguiding core, a Si-N grating layer, and a high-reflection layer. Coupling efficiencies for TE0 and TE1 modes were obtained to be 5% and 46%, respectively, with 0.1-mm interaction length. The focus spot size of 3 x 1 mum was obtained for TE1 mode.
  • K. Oya, T. Nakazawa, S. Kittaka, K. Tsunetomo, K. Kintaka, J. Nishii, K. Hirao Proceedings - 2004 International Conference on MEMS, NANO and Smart Systems, ICMENS 2004 366 -368 2004年 [査読有り][通常論文]
     
    Binary gratings with high first-order transmission diffraction efficiency were covered with a thin SiO 2 film without the filling in the grooves by plasma enhanced chemical vapor deposition. The diffraction efficiencies of about 90 % were attained for transverse-electric (TE) and transverse-magnetic (TM) polarized lights at a wavelength of 1.55 um when the period and depth were 1.5 and 2.8 μm, respectively. The grating was used for the integrated spectrographic chip. A four-channel demultiplexer with 20-nm spacing was fabricated on a silica substrate of 5.1 × 9.2 mm 2, in which a buried grating, a pair of parabolic mirrors and channel waveguides were integrated. It was confirmed by the numerical calculation that the angular dispersion of the grating was increased drastically if the input and output surfaces were tilted against its grating vector, which should be effective to minimize the device size. © 2004 IEEE.
  • NISHII J, KINTAKA K, NAKAZAWA T APPLIED OPTICS 43 (6) 1327 -1330 2004年 [査読無し][通常論文]
  • K Fukumi, A Chayahara, H Kageyama, N Kitamura, K Kadono RADIATION EFFECTS AND ION-BEAM PROCESSING OF MATERIALS 792 99 -104 2004年 [査読無し][通常論文]
     
    Structure of Cu ions in (Cl+Cu)-, (Br+Cu)-, (I+Cu)-, (S+Cu)- and (Se+Cu)-ion implanted silica glasses has been studied by x-ray absorption and optical absorption spectroscopies. Cu ions formed Cu-O bonds in the as-implanted glasses, due to the homogeneous distribution of Cu ions and the low local concentration of halogen and chalcogen ions in silica glass. Heat treatment at about 600degreesC caused the formation of bonds between Cu ions and halogen/chalcogen ions without forming Cu halide or chalcogenide crystals. It was deduced that the formation of these bonds was controlled by the diffusion of Cu ions in silica glass. On the other hands, it was inferred that the formation of Cu halide and chalcogenide crystals was controlled not only by the diffusion of halogen/chalcogen ions but also by the diffusion of matrix ions.
  • JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 112 (5) S1210-S1213 2004年 [査読無し][通常論文]
  • H Nishiyama, Miyamoto, I, K Kintaka, J Nishii FIFTH INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION 5662 135 -140 2004年 [査読無し][通常論文]
     
    High-temperature-resistant laser-induced Bragg gratings were formed in Ge-B-SiO2 thin glass films fabricated by the plasma enhanced chemical vapor deposition method. Such gratings were induced by exposure of an interference pattern with KrF excimer laser and subsequent annealing at 600degreesC. The SEM observation of the grating after HF etching revealed that the origin of the grating was the periodic precipitation of crystalline 20-40-nm-diameter Ge nanoparticles. Nanoparticles precipitated predominantly in the unirradiated region after laser-induced refractive index change completely erased after annealing up to 500degreesC. The maximum value of refractive index modulation Deltan was 6.8 x 10(-3) at 632.8 nm, which corresponds to the Deltan nearly 10 times as large as that before annealing. A channel waveguide with high-temperature-resistant-grating exhibited high diffraction efficiency and excellent thermal stability.
  • 永金 知浩, 北村 直之, 西井 準治 ニュ-ガラス 19 (1) 60 -64 2004年 [査読無し][通常論文]
  • 北村 直之, 福味 幸平, 西井 準治 東北大学金属材料研究所強磁場超伝導材料研究センター年次報告 2004 (0) 173 -175 2004年 [査読無し][通常論文]
  • 西井 準治 日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi 112 (1308) 413 -420 2004年 [査読無し][通常論文]
     
    Fundamental studies of the formation of periodic structures in oxide glasses were reviewed. High spatial frequency gratings and two-dimensional sub-wavelength structures were fabricated using a combination of lithography and dry etching processes. An ultra-small demultiplexer was realized on a SiO_2 tip in which gratings, a pair of parabolic reflecting mirrors, and channel waveguides were integrated. Adopting a precisely regulated sub-wavelength structure achieved low reflectance of the SiO_2 surface. Ultraviolet laser induced structural change was useful for creating diffraction functional...
  • T Fujiwara, T Sawada, T Honma, Y Benino, T Komatsu, M Takahashi, T Yoko, J Nishi JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 42 (12) 7326 -7330 2003年12月 [査読無し][通常論文]
     
    The origin, and properties of second-harmonic generation (SHG) from crystalline particles and their crystalline phases in GeO2-SiO2 glass films were investigated. GeO2-SiO2 glass films with a thickness of approximately 5 pin were fabricated by the chemical vapor-phase deposition (CVD) method. Heat treatments in the temperature range of 1100-1260degreesC for durations of 2-8 h have been performed to crystallize the glass films. X-ray diffraction (XRD) peaks at around 2theta = 22degrees in the crystallized GeO2-SiO2 films were observed, and the obtained XRD patterns in the glass films are exactly the same as those in ultraviolet (UV) poled GeO2-SiO2 glasses with a large second-order, optical nonlinearity comparable to that in LiNbO3 crystals. Using a SHG microscopic technique, it has been found that the intensity of SHG emission from crystalline particles is clearly dependent on stress-induced optical retardation which is accompanied by the formation of crystalline particles of the pseudo-beta-cristobalite containing GeO2. In addition, a new technique for enhancing the intrinsic SHG by means of modification of defect states is demonstrated.
  • W Watanabe, T Asano, K Yamada, K Itoh, J Nishii OPTICS LETTERS 28 (24) 2491 -2493 2003年12月 [査読無し][通常論文]
     
    Refractive-index changes can be induced by filamentation of 800-nm, 1-kHz femtosecond laser pulses in silica glass. Two-dimensional translation of a 40-mum-long filament leads to the formation of a curved waveguide because of bending by the previously induced refractive-index change. The fabrication of 2-mm directional couplers to split the coupled beam into 1:1 at a wavelength of 632.8 am is demonstrated. The realization of three-dimensional directional couplers and wavelength division in the output from the couplers is also demonstrated. (C) 2003 Optical Society of America.
  • 陰山淳一, 金高健二, 西井準治, 平尾一之 ガラスおよびフォトニクス材料討論会講演要旨集 44th 71 -72 2003年11月20日 [査読無し][通常論文]
  • 福味 幸平, 北村 直之, 西井 準治 化学と工業 56 (11) 1229 -1232 2003年11月 [査読無し][通常論文]
  • 北村 直之, 福味 幸平, 西井 準治 セラミックス 38 (11) 888 -892 2003年11月 [査読無し][通常論文]
  • 福味 幸平, 北村 直之, 西井 準治 化学と工業 = Chemistry and chemical industry 56 (11) 1229 -1232 2003年11月01日 [査読無し][通常論文]
  • 北村 直之, 福味 幸平, 西井 準治 セラミックス 38 (11) 888 -892 2003年11月01日 [査読無し][通常論文]
  • 瀬崎文康, 南村清之, 鎌田賢司, 金高健二, 西井準治 マイクロエレクトロニクスシンポジウム論文集 13th 92 -95 2003年10月16日 [査読無し][通常論文]
  • 北村 直之, 福味 幸平, 西井 準治, 高橋 弘紀, 茂木 巌, 淡路 智, 渡辺 和雄 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 27 (0) 533 -533 2003年09月01日 [査読無し][通常論文]
  • 陰山淳一, 金高健二, 西井準治, 平尾一之 応用物理学会学術講演会講演予稿集 64th (2) 823 2003年08月30日 [査読無し][通常論文]
  • 松本慎一, 斉藤光徳, 西山宏昭, 宮本勇, 金高健二, 西井準治 応用物理学会学術講演会講演予稿集 64th (2) 816 2003年08月30日 [査読無し][通常論文]
  • 西山宏昭, 宮本勇, 松本慎一, 斉藤光徳, 金高健二, 西井準治 応用物理学会学術講演会講演予稿集 64th (3) 1108 2003年08月30日 [査読無し][通常論文]
  • 中沢達洋, 橘高重雄, 常友啓司, 金高健二, 西井準治, 平尾一之 応用物理学会学術講演会講演予稿集 64th (3) 884 2003年08月30日 [査読無し][通常論文]
  • 瀬崎文康, 南村清之, 鎌田賢司, 金高健二, 西井準治 応用物理学会学術講演会講演予稿集 64th (3) 1166 2003年08月30日 [査読無し][通常論文]
  • 中澤 達洋, 植田 牧子, 西井 準治 ディスプレイ 9 (8) 78 -82 2003年08月
  • T Fujiwara, T Sawada, Y Benino, T Komatsu, M Takahashi, T Yoko, J Nishii OPTICS EXPRESS 11 (14) 1598 -1606 2003年07月 [査読無し][通常論文]
     
    The authors report what is, to our best knowledge, the first observation of second-harmonic generation (SHG) directly from the crystalline particles in Ge-doped SiO2 (Ge:SiO2) glass films. Ge:SiO2 glass films with approximately 5 mum thickness were fabricated by chemical vapor-phase deposition. X-ray diffraction ( XRD) peaks at around 2theta=22degrees in thermally crystallized Ge:SiO2 films were observed, and obtained XRD patterns are exactly the same as those in ultraviolet-laser-poled Ge: SiO2 glasses. Using SHG microscopic technique with a Nd:YAG laser, it has been successfully found that SH emitting with 532 nm wavelength is observed directly from the crystalline particles induced in the crystallized films. (C) 2003 Optical Society of America.
  • N Kitamura, K Fukumi, J Nishii, T Kinoshita, N Ohno JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 42 (6B) L712 -L714 2003年06月 [査読無し][通常論文]
     
    We have demonstrated the formation of microdots on the surface of densified silica glass by thermal relaxation. Silica glass was densified by approximately 4% with a hot isostatic pressing technique. A small area on the glass surface was heated to sufficiently high temperatures under an ambient pressure to induce structural relaxation by repeated irradiation of focused beam pulses from a CO2 laser. A bump with a Gaussian shape was formed in the small area on the glass Surface after the irradiation. The distribution of temperature on the irradiated surface due to the laser beam profile, optical absorption and thermal diffusion was inferred as the origin of the bump shape. This process provides us a new method of producing components for microoptics consisting of only silica glass. [DOI: 10.1143/JJAP.42.L712].
  • 西井 準治, 中澤 達洋, 植田 牧子 マテリアルインテグレ-ション 16 (6) 24 -28 2003年06月 [査読無し][通常論文]
  • DJ Kang, JU Park, BS Bae, J Nishii, K Kintaka OPTICS EXPRESS 11 (10) 1144 -1148 2003年05月 [査読無し][通常論文]
     
    Inorganic-organic hybrid materials prepared by a sol-gel process showed a large photoinduced negative refractive-index change (2x10(-2)) and a volume change. Diffraction gratings were made directly by irradiation with a KrF excimer laser (248 nm) through a phase mask without any etching process. The dependence of diffraction efficiency on irradiation conditions was investigated. The maximum diffraction efficiency, measured by the Littrow configuration with a He-Ne laser (633 nm), was 3.4% in reflection mode. (C) 2003 Optical Society of America.
  • K Fukumi, A Chayahara, H Kageyama, A Kinomura, Y Mokuno, N Kitamura, K Kadono, Y Horino, J Nishii NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 206 353 -356 2003年05月 [査読無し][通常論文]
     
    Halogen ions (Cl, Br and 1) and copper ions have been implanted in silica glass at the same dose and at energies of the order of MeV, sequentially. The coordination structure of implanted copper atoms has been studied by X-ray absorption fine structure spectroscopy. It was found that implanted Cu atoms were coordinated with two oxygen atoms in all the as-implanted glasses. Heat treatment in air caused the formation of copper-halogen bonds without the formation of halide crystals. Further heat-treatment caused the formation of halide crystals in the glasses. (C) 2003 Elsevier Science B.V. All rights reserved.
  • K Fukumi, A Chayahara, A Kinomura, H Kageyama, K Kadono, N Kitamura, J Nishii, Y Horino JOURNAL OF MATERIALS RESEARCH 18 (4) 885 -894 2003年04月 [査読無し][通常論文]
     
    The valence and coordination structure of implanted Cu and Br ions were investigated by x-ray absorption fine structure spectroscopy in (2.4 MeV 6 X 10(16) Br2+ ions cm(-2) + 2 MeV 6 x 10(16) Cu+ ions cm(-2))-implanted silica glass. It was found that the implanted Cu and Br atoms were coordinated by oxygen atoms and silicon atoms, respectively, in as-implanted glass. After heating at 600 degreesC, at, least two-thirds of the Cu atoms were coordinated by Br atoms without the formation of crystals. The gamma-CuBr crystal was formed after heating to 1100 degreesC. It was deduced that the Coordination structure of Cu and Br atoms depends on defects as well as thermochemical stability and mass transport processes.
  • 陰山淳一, 井本克之, 田中修平, 金高健二, 西井準治, 平尾一之 応用物理学関係連合講演会講演予稿集 50th (2) 989 2003年03月27日 [査読無し][通常論文]
  • 山田和宏, 渡辺歴, 金高健二, 西井準治, 伊東一良 応用物理学関係連合講演会講演予稿集 50th (3) 1216 2003年03月27日 [査読無し][通常論文]
  • 西山宏昭, 佐野智一, 大村悦二, 宮本勇, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 50th (3) 1296 2003年03月27日 [査読無し][通常論文]
  • 中沢達洋, 植田牧子, 橘高重雄, 常友啓司, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 50th (3) 1053 2003年03月27日 [査読無し][通常論文]
  • 佐藤 史雄, 坂本 明彦, 和田 正紀, 常岡 貴士, 竹内 宏和, 西井 準治 電子情報通信学会総合大会講演論文集 2003 (1) 235 -235 2003年03月03日
  • 西井 準治, 金高 健二 マテリアルステージ 2 (11) 68 -71 2003年02月
  • K Yamada, W Watanabe, J Nishii, K Itoh JOURNAL OF APPLIED PHYSICS 93 (4) 1889 -1892 2003年02月 [査読無し][通常論文]
     
    Permanent refractive-index change can be induced by a self-trapped filament of intense ultrashort laser pulses in silica glass. We investigated the dependence of refractive-index change on polarization of incident laser pulses. As the region of refractive-index change can be selectively etched by hydrofluoric acid (HF), we first polished the sample and etched the cross section of the regions. The HF-etched cross section of refractive-index change that was induced by linearly polarized pulses was seen to be elliptical when observed with a scanning-electron microscope. By polarimetric analysis of diffraction from gratings fabricated by polarized ultrashort laser pulses, the index ellipsoid of refractive-index change was confirmed to be uniaxial and negative. (C) 2003 American Institute of Physics.
  • H Nishiyama, T Sano, E Ohmura, Miyamoto, I, S Matsumoto, M Saito, K Kintaka, J Nishii FOURTH INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION 5063 491 -494 2003年 [査読無し][通常論文]
     
    Waveguide filters with extremely thermally stabilized KrF laser-induced gratings were fabricated in the highly photosensitive Ge-B-SiO2 thin films. It was discovered that a completely new-type grating with high diffraction efficiency and thermal stability could be formed by annealing a conventional laser-induced grating at 600degreesC. Such thermally induced gratings couldn't be erased after repeated heat treatment alternating between room temperature and 600degreesC. We printed a grating in slab waveguide by irradiation with a KrF excimer laser followed by the annealing at 600degreesC, and then formed the channel in the region of the grating using standard photolithography process. The diffraction peak of 17 dB in depth at 1535.04 nm wavelength was observed after repeated heat treatment alternating between room temperature and 400degreesC. These thermally stabilized waveguide filters are promising candidate for the highly reliable optical and sensing devices.
  • J Nishii, K Kintaka, Y Kawamoto, M Takahashi THIRD INTERNATIONAL SYMPOSIUM ON LASER PRECISION MICROFABRICATION 4830 361 -366 2003年 [査読無し][通常論文]
     
    Ge-SiO2 thin films with extremely high photosensitivity against excimer laser light were fabricated by plasma enhanced chemical vapor deposition method. Direct formation of channel waveguide was successfully confirmed only by irradiation with excimer laser through a Cr mask pattern, which was previously coated on the slab-waveguide by sputtering method. Bragg gratings with high diffraction efficiency were also printed in the waveguide by another laser irradiation through the phase mask. Channel waveguides with Bragg gratings, on the other hand, were fabricated on the glass ceramic substrates with negative thermal expansion coefficient. Doping of B2O3 to Ge-SiO2 glass film, was effectively suppressed the temperature-drift of the stop band (dlambda/dT)of the grating. The dlambda/dT attained in this study was 5pm/degreesC, which was less than 1/2 of those for commercially available waveguide gratings. The wavegides with gratings using the photosensitive oxide thin films should be a promising candidate for future low cost and reliable optical access network.
  • N Tohge, M Hasegawa, N Noma, K Kintaka, J Nishii JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 26 (1-3) 903 -907 2003年01月 [査読無し][通常論文]
     
    Two-dimensional (2D) surface-relief gratings have been fabricated by the two-beam interference method on photosensitive gel films, which are derived from chemically modified metal-alkoxides, and characterized with respect to surface morphology and antireflection effect. Photosensitive ZrO2 gel film was deposited on a silica glass substrate using the sol that was prepared from Zr-tetrabutoxide chemically modified with benzoylacetone. The gel film was exposed to two-beam interference fringe (1.0 mum period) of He-Cd laser and then rotated by 90degrees in its own plane, followed by an additional exposure. Leaching of the gel film with ethanol gave lattice or island types of 2D-gratings depending on the dose of laser irradiation. The morphology of the gratings changed with irradiation time of laser, leaching conditions and so on. The formation of 2D-grating of island type on a silica glass substrate substantially reduced the reflection at its surface in a wavelength range of 1.3 to 2.6 mum.
  • Junji Nishii, Kenji Kintaka, Yasushi Kawamoto, Akio Mizutani, Hisao Kikuta Journal of the Ceramic Society of Japan 111 (1289) 24 -27 2003年 [査読無し][通常論文]
     
    A two-dimensional microstructure with low reflectance was fabricated on the surface of an SiO2 plate by the precise regulation of its shape and surface morphology. A periodically dotted mask pattern of a positive resist was formed on SiO2 by a two-beam interference method using a He-Cd laser with a wavelength of 325 nm. The substrate was rotated by 90° between the first and second irradiation steps. The microstructure of SiO2 was etched using an electron cyclotron resonance plasma. The reflection loss was effectively minimized by overcoating an SiO2 thin film on the microstructure followed by chemical etching in an HF solution. Steady fabrication of subwavelength structures (SWSs) having a reflectance less than 0.1% was possible by using these surface treatment methods.
  • T Fujiwara, R Ogawa, Y Benino, T Komatsu, J Nishii INTERNATIONAL SYMPOSIUM ON PHOTONIC GLASS (ISPG 2002) 5061 114 -122 2003年 [査読無し][通常論文]
     
    We propose and demonstrate gratings and two-dimensional (2D) photonic structure of nanometer-scale crystals/particles in glass surface created by one of the most simple way ever reported. Grating structures consisting of nanocrystals have been fabricated on surface of tellurite-based glasses, with a composition of 15K(2)O-15Nb(2)O(5)-70TeO(2) (mol%), using photoinduced nano-crystallization. A conventional phase mask technique was performed for the grating fabrication with a XeCl excimer laser operating at 308 nm. Periodic structure with 400 nm pitch constructed by lines of regularly ordered nanoparticles having a diameter up to about 100 nm was confirmed by atomic force microscopy and scanning electron microscopy. It is strongly suggested from measurement of X-ray diffraction that the photoinduced nanoparticles have a crystalline phase, and also suggested from measurement of optical frequency doubling that the periodic nanoparticle structure exhibits second harmonic generation (SHG) with an unique polarization dependence of SHG based on nano-structures of dielectric polarization. In addition, such a simple method of phase mask usage was applied to formation of 2D array, and the 2D structures of nano-particles/holes were. successfully obtained by laser irradiations.
  • 西井準治, 金高健二, 西山宏昭, 宮本勇 レーザ加工学会論文集 57th 20 -25 2002年12月04日 [査読無し][通常論文]
  • K Fukumi, A Chayahara, N Kitamura, Y Horino, S Sodeoka, H Yamanaka, J Nishii JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 41 (12) 7447 -7452 2002年12月 [査読無し][通常論文]
     
    The chemical state of implanted Mg atoms has been studied in 2.48 x 10(17) Mg+ ions cm(-2)-implanted silica glass by X-ray photoelectron spectroscopy. It was found that Mg atoms were coordinated with oxygen atoms, irrespective of the heat treatment at 900degreesC in an argon gas atmosphere. Mg ion implantation caused oxygen deficient species (SiOx) and increased the refractive index by about 5%. The oxygen deficient species and the refractive index change were stable against the heat treatment.
  • 西山宏昭, 佐野智一, 大村悦二, 宮本勇, 金高健二, 西井準治 ガラスおよびフォトニクス材料討論会講演要旨集 43rd 20 -21 2002年11月21日 [査読無し][通常論文]
  • S Ojima, T Hatano, K Kintaka, J Nishi JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 41 (11A) 6390 -6393 2002年11月 [査読無し][通常論文]
     
    The refractive index of polyimide can be changed by irradiation with ultraviolet light. The amount of change in refractive index is > 10(-3). The Kramers-Kronig model can explain the mechanism. Utilizing this phenomenon, Bragg gratings can be fabricated in a polyimide waveguide by irradiation with an ultraviolet laser beam. It has a possibility of application in tunable wavelength filters because polyimide has a birefringent characteristic and a large thermooptical constant.
  • M Takahashi, K Ichii, Y Tokuda, T Uchino, T Yoko, J Nishii, T Fujiwara JOURNAL OF APPLIED PHYSICS 92 (7) 3442 -3446 2002年10月 [査読無し][通常論文]
     
    The photochemical reaction of Ge2+ in 10GeO(2)-90SiO(2) optical fiber preform and the origin of the 5.7 eV optical absorption band induced by intense ultraviolet laser excitation have been investigated using a near-ultraviolet XeF excimer laser (3.7 eV) as the main excitation source. Based on the previous and present experimental results, it is concluded that the 5.7 eV optical absorption band does not originate from the Ge(2) electron trapped center. In place of this model, we have proposed an alternative structural model for the origin of the 5.7 eV band taking into account the experimental fact that the corresponding center is diamagnetic. In addition, it is found that the site selective excitation of the Ge2+ center can be achieved by using laser sources with different photon energies. (C) 2002 American Institute of Physics.
  • 西山宏昭, 佐野智一, 大村悦二, 宮本勇, 金高健二, 西井準治 応用物理学会学術講演会講演予稿集 63rd (3) 859 2002年09月24日 [査読無し][通常論文]
  • 小島誠司, 波多野卓史, 金高健二, 西井準治 応用物理学会学術講演会講演予稿集 63rd (3) 1012 2002年09月24日 [査読無し][通常論文]
  • 金高健二, 西井準治, 川本泰, 坂本明彦 応用物理学会学術講演会講演予稿集 63rd (3) 1038 2002年09月24日 [査読無し][通常論文]
  • W Watanabe, D Kuroda, K Itoh, J Nishii OPTICS EXPRESS 10 (19) 978 -983 2002年09月 [査読無し][通常論文]
     
    We fabricated the Fresnel zone plate by embedding voids in silica glass. We investigated the focusing properties by launching a He-Ne laser beam into the zone plate. The spot size of the primary focal point was 7.0 mum and agreed with the theoretical value of 6.1 mum. The diffraction efficiency was 2.0 %. This technique enables us to make alignment free micro-scale lenses inside bulk materials. (C) 2002 Optical Society of America.
  • 永井秀典, 宮道隆, 金高健二, 西井準治, 脇田慎一, 伊永隆史, 二木鋭雄 化学とマイクロシステム研究会講演要旨集 6th 84 2002年08月06日 [査読無し][通常論文]
  • K Kintaka, J Nishii, Y Kawamoto, A Sakamoto, PG Kazansky OPTICS LETTERS 27 (16) 1394 -1396 2002年08月 [査読無し][通常論文]
     
    Waveguide Bragg gratings were fabricated by plasma-enhanced chemical-vapor deposition followed by irradiation with KrF excimer laser light through a phase mask. The period of the Bragg grating was 0.53 mum, and the Bragg wavelength was similar to1.53 mum. The temperature dependence of the Bragg wavelength was 11 pm/degreesC for a 10GeO(2)-90SiO(2) (mol.%) core waveguide on a Si substrate, and the Bragg wavelength shift was successfully reduced to 5.0pm/degreesC by use of a 14GeO(2)-12B(2)O(3)-74SiO(2) (mol.%) core and a crystallized glass substrate with a thermal-expansion coefficient of -2.0 x 10(-6) (/degreesC). (C) 2002 Optical Society of America.
  • J Nishii, K Kintaka, N Tohge, N Noma, M Hasegawa, A Mizutani, H Kikuta JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 41 (8) 5210 -5213 2002年08月 [査読無し][通常論文]
     
    Low-reflection microstructures were formed by the use,of a two-beam interference patterning on a photosensitive ZrO2 gel film. Gel films coated on SiO2 glass were exposed to an interference fringe of 325 nm He-Cd laser beams. The substrate was rotated by 90degrees between the first and second irradiation steps. Island and lattice type periodic two-dimensional structures with a pitch of 1 mum were formed after the irradiation followed by leaching with ethanol. Reflectance of 0.1% for an optically polished SiO2 surface was attained at around a 1750 nm wavelength by the formation of an island-type microstructure. The transmission spectrum was successfully simulated by the rigorous coupled wave analysis. The heat treatment of the microstructure up to a temperature of 200degreesC was possible in an ambient. atmosphere without a conspicuous increase in reflectance.
  • N Kitamura, K Fukumi, J Nishii, M Makihara, T Sasaki, N Ohno JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 63 (4) 691 -694 2002年04月 [査読無し][通常論文]
     
    The effect on transmittance and reflectance in the vacuum ultraviolet (VUV) region by doping alkali fluorides (LiF, NaF and KF) has been investigated in a ternary fluoroaluminate (18BaF(2)-37CaF(2)-45AlF(3)) glass. The absorption edge of the glass obeys the Urbach rule and was shifted monotonically towards higher energies by increasing the concentration of each alkali fluoride. The VUV reflection peak at 11.3 eV was not sensitive to the change of the concentration of dopants. The magnitude of the edge shift was 10-20 times larger than that expected from the additive law on the magnitude of absorption coefficients of the glass and alkali fluorides. An excitonic interaction similar to that observed in mixed crystals of alkali halides is suggested from the monotonic shift toward the absorption edges of the dopants. The weak sensitivity of the reflection peak upon doping supports that the excitonic state lies predominantly around the edge energies. (C) 2002 Elsevier Science Ltd. All rights reserved.
  • 西 壽巳, 松村 晶, 西井 準治 電子情報通信学会論文誌. C, エレクトロニクス 85 (4) 302 -303 2002年04月01日 [査読無し][通常論文]
     
    長周期ファイバグレーティング(LPFG)は数百μmのグレーティング周期をもち,帯域阻止フィルタとして機能する.LPFGは紫外線露光後に行うアニール処理により波長特性が大きく変化するため,紫外線露光時にフィルタ特性を正確に予測することが容易ではない.本論文では作製後のLPFG外周部に光ファイバクラッド部と異なる屈折率をもつ媒質を部分的に装荷することによって,共振特性を可逆的に制御する方法を提案する.実験により共振深さがチューニングできることが確かめられた.
  • 川本泰, 堀尾浩司, 金高健二, 西井準治, 水谷彰夫, 菊田久雄 応用物理学関係連合講演会講演予稿集 49th (3) 954 2002年03月27日 [査読無し][通常論文]
  • 川本泰, 堀尾浩司, 金高健二, 西井準治, 坂本明彦 応用物理学関係連合講演会講演予稿集 49th (2) 910 2002年03月27日 [査読無し][通常論文]
  • 大岸厚文, 本山慎一, 立田利明, 辻理, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 49th (2) 628 2002年03月27日 [査読無し][通常論文]
  • 小島誠司, 波多野卓史, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 49th (3) 1173 2002年03月27日 [査読無し][通常論文]
  • 西山宏昭, 宮本勇, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 49th (2) 918 2002年03月27日 [査読無し][通常論文]
  • 長嶋達雄, 近藤裕己, 武信省太郎, 杉本直樹, 伊藤節郎, 田部勢津久, 花田禎一, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 49th (3) 1178 2002年03月27日 [査読無し][通常論文]
  • 金高健二, 西井準治, 川本泰, 坂本明彦 応用物理学関係連合講演会講演予稿集 49th (3) 1177 2002年03月27日 [査読無し][通常論文]
  • 杉本尚矢, 峠登, 金高健二, 西井準治 日本セラミックス協会年会講演予稿集 2002 90 2002年03月24日 [査読無し][通常論文]
  • Y Li, W Watanabe, K Yamada, T Shinagawa, K Itoh, J Nishii, YY Jiang APPLIED PHYSICS LETTERS 80 (9) 1508 -1510 2002年03月 [査読無し][通常論文]
     
    Gratings have been holographically fabricated inside soda-lime glass by two-beam interference of a single 130 fs laser pulse at a wavelength of 800 nm. Because the grating was localized in the focal volume and the depth at which the grating was formed can be controlled by translation of the sample, multiple layers of grating can be fabricated. As an example, three layers of grating have been recorded at depths of similar to200, similar to400, and similar to600 mum, respectively. These gratings can be read by either of the two recording beams with reduced energy, which demonstrates their potential applications in integrated optics and optical storage. (C) 2002 American Institute of Physics.
  • 西井準治, 金高健二, 川本泰, 水谷彰夫, 菊田久雄 セラミックス基礎科学討論会講演要旨集 40th 14 -15 2002年01月22日 [査読無し][通常論文]
  • 松村 晶, 西 壽巳, 西井 準治 電子情報通信学会技術研究報告. PS, 光スイッチング 101 (583) 95 -100 2002年01月17日 [査読無し][通常論文]
     
    長周期ファイバグレーティング(LPFG)は数百μmのグレーティング周期を持ち、帯域阻止フィルターとして機能する。LPFGは紫外線露光後に行うアニール処理により波長特性が大きく変化するため、紫外線露光時にフィルター特性を正確に予測することが容易ではない。そこで我々はアニーリング後のファイバ外周部にクラッド部と異なる屈折率を持つ媒質を局所的に装荷することによって、共振特性を制御する方法を提案する。実験の結果、共振波長と共振深さ(Q値)を独立にチューニンクできることか確かめられた。
  • 松村 晶, 西 壽巳, 西井 準治 電子情報通信学会技術研究報告. OFT, 光ファイバ応用技術 101 (586) 95 -100 2002年01月17日 [査読無し][通常論文]
     
    長周期ファイバグレーティング(LPFG)は数百μmのグレーティング周期を持ち、帯域阻止フィルターとして機能する。LPFGは紫外線露光後に行うアニール処理により波長特性が大きく変化するため、紫外線露光時にフィルター特性を正確に予測することが容易ではない。そこで我々はアニーリング後のファイバ外周部にクラッド部と異なる屈折率を持つ媒質を局所的に装荷することによって、共振特性を制御する方法を提案する。実験の結果、共振波長と共振深さ(Q値)を独立にチューニングできることか確かめられた。
  • 松村 晶, 西 壽巳, 西井 準治 電子情報通信学会技術研究報告. OPE, 光エレクトロニクス 101 (589) 95 -100 2002年01月17日 [査読無し][通常論文]
     
    長周期ファイバグレーティング(LPFG)は数百μmのグレーティング周期を持ち、帯域阻止フィルターとして機能する。LPFGは紫外線露光後に行うアニール処理により波長特性が大きく変化するため、紫外線露光時にフィルター特性を正確に予測することが容易ではない。そこで我々はアニーリング後のファイバ外周部にクラッド部と異なる屈折率を持つ媒質を局所的に装荷することによって、共振特性を制御する方法を提案する。実験の結果、共振波長と共振深さ(Q値)を独立にチューニングできることか確かめられた。
  • 松村 晶, 西 壽巳, 西井 準治 電子情報通信学会技術研究報告. LQE, レーザ・量子エレクトロニクス 101 (592) 95 -100 2002年01月17日 [査読無し][通常論文]
     
    長周期ファイバグレーティング(LPFG)は数百μmのグレーティング周期を持ち、帯域阻止フィルターとして機能する。LPFGは紫外線露光後に行うアニール処理により波長特性が大きく変化するため、紫外線露光時にフィルター特性を正確に予測することが容易ではない。そこで我々はアニーリング後のファイバ外周部にクラッド部と異なる屈折率を持つ媒質を局所的に装荷することによって、共振特性を制御する方法を提案する。実験の結果、共振波長と共振深さ(Q値)を独立にチューニングできることか確かめられた。
  • 西井 準治, 金高 健二, 川本 泰 ニュ-ガラス 17 (4) 17 -20 2002年
  • Mitsuru Watanabe, Saulius Juodkazis, Junji Nishii, Shigeki Matsuo, Hiroaki Misawa Proceedings of SPIE - The International Society for Optical Engineering 159 -168 2002年01月01日 [査読無し][通常論文]
     
    We report the observation of 3/2-frequency generation during an Optically-induced failure of silica under femtosecond laser pulse irradiation. The origin of 3/2-frequency generation is due to a two-plasmon decay instability, which occurs at the quarter critical density of free charge carriers. We observed this emission during the optical damaging of glasses by tightly focused (numerical aperture of the objective lens was 0.5-1.35) femtosecond laser pulses. The pulse duration at the irradiation spot was about 0.35 ps, the energy 25-250 nJ, and the damage was recorded in a single shot event inside the glass. The emission at about 530 nm was only present in the spectra measured during an optical damage by 795 nm irradiation with the pulse energy 9 times and more higher than the threshold. We observed a new phenomenon applicable for microstructuring of glass. The high energy fs pulses (50-200 μJ) were focused by a piano-convex lens (focal length 2-10 cm) on the exit surface of a glass plate. The surface was ablated and the ablation was transferred into a volume of glass by translation of a "plasma spark". The length of such a channels can by up to few-cm and with a diameter of tens-of-micrometers. The mechanism and application of high-fluence fs fabrication in dielectrics is discussed. ? 2002 SPIE ? 0277-786X/02/$15.00.
  • Y. Kondo, T. Nagashima, S. Takenobu, N. Sugimoto, S. Ito, S. Tanabe, T. Hanada, K. Kintaka, J. Nishii Conference on Optical Fiber Communication, Technical Digest Series 70 11 -12 2002年 [査読有り][通常論文]
     
    The fabrication of Bi2O3-based Er-doped waveguide for integrated optical amplifiers was discussed. The fluorescence spectrum width of the Bi2O3 based glass film due to the Er3+ transition was found to be broader than that of conventional host glass such as SiO2 and phosphate glass. The optical signal enhancement was observed with a forward pump power of 160 mW.
  • T Kawahara, Y Konishi, H Tada, N Tohge, J Nishii, S Ito ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 41 (15) 2811 -+ 2002年 [査読無し][通常論文]
  • Laser induced photonic periodic structure in tellurite based glass ceramics
    PHYSICS AND CHEMISTRY OF GLASSES 43c 213 -216 2002年 [査読無し][通常論文]
  • 中澤 達洋, 植田 牧子, 西井 準治 ニュ-ガラス 17 (3) 32 -36 2002年 [査読無し][通常論文]
  • Y Li, K Itoh, W Watanabe, K Yamada, D Kuroda, J Nishii, YY Jiang OPTICS LETTERS 26 (23) 1912 -1914 2001年12月 [査読無し][通常論文]
     
    By moving silica glass in a preprogrammed structure, we directly produced three-dimensional holes with femtosecond laser pulses in single step. When distilled water was introduced into a hole drilled from the rear surface of the glass, the effects of blocking and redeposition of ablated material were greatly reduced and the aspect ratio of the depth of the hole was increased. Straight holes of 4-mum diameter were more than 200 mum deep. Three-dimensional channels can be micromachined inside transparent materials by use of this method, as we have demonstrated by drilling a square-wave-shaped hole inside silica glass. (C) 2001 Optical Society of America.
  • K Kintaka, J Nishii, A Mizutani, H Kikuta, H Nakano OPTICS LETTERS 26 (21) 1642 -1644 2001年11月 [査読無し][通常論文]
     
    Two-dimensional periodic structures were fabricated upon a fluorine-doped SiO2 film in which the fluorine content changed gradually in the direction of film thickness. The films were deposited by plasma-enhanced chemical-vapor deposition. The film was periodically patterned into a 1-mum period and an similar to1-mum-groove depth by inductive coupled plasma reactive-ion etching followed by chemical etching in a diluted HF solution. A surface reflectance of 0.7% was attained at 1.85-mum wavelength, a value that is one fifth as large as the 3.5% Fresnel reflection of a SiO2 substrate with a flat surface. (C) 2001 Optical Society of America.
  • 長谷川雅也, 峠登, 金高健二, 西井準治 日本セラミックス協会秋季シンポジウム講演予稿集 14th 147 2001年09月26日 [査読無し][通常論文]
  • 西井準治, 金高健二, 長谷川雅也, 峠登, 水谷彰夫, 菊田久雄 応用物理学会学術講演会講演予稿集 62nd (3) 750 2001年09月11日 [査読無し][通常論文]
  • 金高健二, 西井準治, 水谷彰夫, 菊田久雄, 中野博彦 応用物理学会学術講演会講演予稿集 62nd (3) 750 2001年09月11日 [査読無し][通常論文]
  • 西山宏昭, 宮本勇, 金高健二, 西井準治 応用物理学関係連合講演会講演予稿集 48th (2) 939 2001年03月28日 [査読無し][通常論文]
  • 西井 準治 セラミックス 36 (2) 63 -66 2001年02月01日 [査読無し][通常論文]
  • 西井 準治 化学工業 51 (11) 844 -849 2000年11月 [査読無し][通常論文]
  • 西井準治, 金高健二, MARTINEZ‐GUERRERO R 応用物理学会学術講演会講演予稿集 61st (2) 832 2000年09月03日 [査読無し][通常論文]
  • 西井準治, 金高健二, 高橋宏滋 工業材料 48 (7) 42 -45 2000年07月01日 [査読無し][通常論文]
  • 通商産業省近畿通商産業局技術企画課, 西井 準治 マンスリーきんき (367) 38 -43 2000年04月 [査読無し][通常論文]
  • 金高健二, 西井準治, 高橋宏滋 応用物理学関係連合講演会講演予稿集 47th (2) 931 2000年03月28日 [査読無し][通常論文]
  • 西井準治, 金高健二 光技術コンタクト 37 (12) 777 -782 1999年12月20日 [査読無し][通常論文]
  • 西井準治, 金高健二 応用物理 68 (10) 1140 -1143 1999年10月10日 [査読無し][通常論文]
  • 金高健二, 溝口拓, 西井準治, 高橋宏滋 応用物理学会学術講演会講演予稿集 60th (2) 785 1999年09月01日 [査読無し][通常論文]
  • 金高健二, 西井準治, 千葉史雄, 峠登 応用物理学会学術講演会講演予稿集 60th (2) 442 1999年09月01日 [査読無し][通常論文]
  • 金高健二, 西井準治, 上野竜一, 千葉史雄, 峠登 応用物理学関係連合講演会講演予稿集 46th (3) 1042 1999年03月28日 [査読無し][通常論文]
  • 金高健二, 西井準治, 上野竜一, 千葉史雄, 峠登 日本セラミックス協会年会講演予稿集 1999 271 1999年03月25日 [査読無し][通常論文]
  • J. NIshii, K. Kintaka, H. Hosono, H. Kawazoe Rad. Effects & Defects 150 (1-4) 379 -383 1999年 [査読無し][通常論文]
     
    Essential reaction induced by KrF laser irradiation in GeO2-SiO2 glasses was the pair generation of electron-trapped centers of Ge ion (GEC) and self-trapped hole (STH) centers of bridging oxygen. The GEC relaxed to GeE′ center during irradiation. This relaxation proceeded quickly with increasing GeO2 content. The concentration ratio of [STH] to [GEC + GeE′] was approximately 1 : 2. After annealing at room temperature, the majority of STH recombined with GEC (or GeE′). It was considered that the origin of this charge imbalance was the hole transfer from STH to other ions. © 1999 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint.
  • 稲川 郁夫, 山下 俊晴, 西井 準治, 城谷 一民 室蘭工業大学紀要 48 (0) 81 -92 1998年11月13日 [査読無し][通常論文]
     
    投稿論文
  • J. Nishii, H. Yamanaka, H. Hosono, H. Kawazoe Nucl. Instr. Meth. Phys. Res.B 141 (1/4) 625 -628 1998年 [査読無し][通常論文]
  • Y.Watanabe, J.Nishii, H.Moriwaki, G.Furuhashi, H.Hosono, H.Kawazoe J.Non-Cryst.Sol. 239 (1/3) 104 -107 1998年 [査読無し][通常論文]
  • 西井 準治 ニュ-ガラス 12 (4) 26 -30 1997年12月 [査読無し][通常論文]
  • H.Hosono, M.Mizuguchi, H.Kawazoe, J.Nishii Jap.J.Appl.Phys. 35 (2B) L234 -L236 1996年 [査読無し][通常論文]
     
    Correlations between optical absorptions in ultraviolet and vacuum ultraviolet regions and Ge E' centers were examined using 9SiO2· 1GeO2 glasses irradiated with ArF excimer laser light in order to determine the optical absorption bands due to Ge E' centers and the oscillator strength. A good correlation between the band peaking at 6.3 eV and Ge E' centers was found in the isochronal annealing experiment. The oscillator strength of the 6.3 eV band was determined to be 0.5± 0.1 on the assumption of the above correlation. The large oscillator strength of the 6.3 eV band due to Ge E' centers is compatible with the Kramers-Kronig mechanism for photoinduced Bragg grating formation.
  • H.Hosono, H.Kawazoe, J.Nishii Phys.Rev.B 53 (18) R11921 -R11923 1996年 [査読無し][通常論文]
  • H.Hosono K.Kawamura, H.Kawazoe, J.Nishii J.Appl.Phys. 80 (5) 3115 -3117 1996年 [査読無し][通常論文]
  • Junji Nishii, Naoyuki Kitamura, Hiroshi Yamanaka, Hideo Hosono, Hiroshi Kawazoe Optics Letters 20 (10) 1184 -1186 1995年05月15日 [査読無し][通常論文]
     
    Photochemical reactions in 10 GeO2 –90 SiO2 glass induced by irradiation with excimer lasers (KrF, 5.0 eV, XeCl, 4.0 eV) and a Hg lamp (4.9 eV) were examined. The irradiation with excimer lasers generated two types of paramagnetic defect, an electron-trapped center associated with fourfold coordinated Ge ions and a self-trapped hole center on bridging oxygen. Taking the optical band gap (˜7.1 eV) of the glass obtained in this work and the power density of laser pulses [10–90 mJy(cm2 pulse), pulse duration 20 ns] into account, we concluded that these centers were formed by band-to-band excitation by two-photon absorption process. On the other hand, the lamp illumination (, 16 mWycm2) caused the formation of Ge E0 centers from preexisting oxygen-vacancy-type defects by the one-photon absorption process. These two kinds of reaction proceed independently, depending on the power densities of UV beams, at least in our experimental condition. © 1995, Optical Society of America.
  • Junji Nishii, Naoyuki Kitamura, Hiroshi Yamanaka, Hideo Hosono, Hiroshi Kawazoe Optics Letters 20 (10) 1184 -1186 1995年05月15日 [査読無し][通常論文]
     
    Photochemical reactions in 10 GeO2 –90 SiO2 glass induced by irradiation with excimer lasers (KrF, 5.0 eV, XeCl, 4.0 eV) and a Hg lamp (4.9 eV) were examined. The irradiation with excimer lasers generated two types of paramagnetic defect, an electron-trapped center associated with fourfold coordinated Ge ions and a self-trapped hole center on bridging oxygen. Taking the optical band gap (˜7.1 eV) of the glass obtained in this work and the power density of laser pulses [10–90 mJy(cm2 pulse), pulse duration 20 ns] into account, we concluded that these centers were formed by band-to-band excitation by two-photon absorption process. On the other hand, the lamp illumination (, 16 mWycm2) caused the formation of Ge E0 centers from preexisting oxygen-vacancy-type defects by the one-photon absorption process. These two kinds of reaction proceed independently, depending on the power densities of UV beams, at least in our experimental condition. © 1995, Optical Society of America.
  • Photon Induced Changes of 5eV band in GeO_2_-SiO_2_ Glasses Prepared by VAD and Sputtering Methods
    J.Nishii, H.Yamanaka, H.Hosono, H.Kawazoe Glass Science and Technology 67C 322 -324 1995年 [査読無し][通常論文]
  • UV-induced Photochemical Reactions and Point Defects in Photorefractive SiO_2_:GeO_2_ and Implanted SiO_2_ Glasses
    H.Hosono, J.Nishii, H.Kawazoe Technical Digest Series 22 61 -64 1995年 [査読無し][通常論文]
  • Junji Nishii, Hiroshi Yamanaka, Hideo Hosono, Hiroshi Kawazoe Applied Physics Letters 64 (3) 282 -284 1994年 [査読無し][通常論文]
     
    Thin films (4.6 μm thick) of 5 GeO2-95 SiO2 and 55 GeO2-45 SiO2 (mol %) glasses were prepared by rf sputtering method in an Ar-O2 atmosphere. An intense absorption band at around 5 eV was distinctly observed in both films after the as-deposited films were annealed at 350°C for 30 min in a vacuum. A part of this 5-eV band was gradually decreased by UV irradiation. Saturated absorptivity changes (-Δα∞) of the UV bleached component, which is considered to be the origin of Hill gratings [K. O. Hill, Y. Fujii, and B. S. Kawasaki, Appl. Phys. Lett. 32, 647 (1978)] and second-harmonic generation in SiO2 glass fibers doped with GeO2, after a prolonged irradiation were 50 cm-1 for 5 GeO2-95 SiO2 films and 400 cm-1 for 55 GeO2-45 SiO2 films. These values are greater by one or two orders of magnitude than those (∼2 cm-1) of bulk germanosilicate glasses prepared by the vapor axial deposition method.
  • Junji Nishii, Hiroshi Yamanaka, Hideo Hosono, Hiroshi Kawazoe Applied Physics Letters 64 (3) 282 -284 1994年 [査読無し][通常論文]
     
    Thin films (4.6 μm thick) of 5 GeO2-95 SiO2 and 55 GeO2-45 SiO2 (mol %) glasses were prepared by rf sputtering method in an Ar-O2 atmosphere. An intense absorption band at around 5 eV was distinctly observed in both films after the as-deposited films were annealed at 350°C for 30 min in a vacuum. A part of this 5-eV band was gradually decreased by UV irradiation. Saturated absorptivity changes (-Δα∞) of the UV bleached component, which is considered to be the origin of Hill gratings [K. O. Hill, Y. Fujii, and B. S. Kawasaki, Appl. Phys. Lett. 32, 647 (1978)] and second-harmonic generation in SiO2 glass fibers doped with GeO2, after a prolonged irradiation were 50 cm-1 for 5 GeO2-95 SiO2 films and 400 cm-1 for 55 GeO2-45 SiO2 films. These values are greater by one or two orders of magnitude than those (∼2 cm-1) of bulk germanosilicate glasses prepared by the vapor axial deposition method.
  • 山岸 隆司, 稲川 郁夫, 西井 準治 セラミックス 24 (4) p285 -290 1989年04月 [査読無し][通常論文]
  • H.Kawazoe, H.Hosono, J.Nishii J.Chem.Phys. 76 (7) 3422 -3428 1982年 [査読無し][通常論文]
  • H.Kawazoe, H.Hosono, J.Nishii J.Non-Cryst.Sol. 52 (1/3) 129 -133 1982年 [査読無し][通常論文]
  • 金属イオンプローブによる酸素酸塩ガラスのキャラクタリゼーション
    金沢孝文, 川副博司, 細野秀雄, 西井準治 旭硝子工業技術奨励会研究報告 40 25 -29 1981年 [査読無し][通常論文]
  • H.Hosono, J.Nishii, H.Kawazoe, T.Kanazawa J.Phys.Chem. 84 (18) 2316 -2319 1980年 [査読無し][通常論文]
  • Pair generation of Ge electron centers and self-trapped hole centers in GeO2 -SiO2 glasses by KrF excimer-laser irradiation
    Physical Review B, Vol.60, pp.7166-7169 [査読無し][通常論文]
  • Infrared Fiber Optics
    CRC Press, 1998 [査読無し][通常論文]
  • Photochemical Reactions in GeO2-SiO2 glasses Induced by Ultraviolet Irradiation
    Physical Review B, Vol.52, pp.1661-1665, 1995 [査読無し][通常論文]
  • Infrared Fiber Optics
    CRC Press, 1998 [査読無し][通常論文]
  • Photochemical Reactions in GeO2-SiO2 glasses Induced by Ultraviolet Irradiation
    Physical Review B, Vol.52, pp.1661-1665, 1995 [査読無し][通常論文]
  • Pair generation of Ge electron centers and self-trapped hole centers in GeO2 -SiO2 glasses by KrF excimer-laser irradiation
    Physical Review B, Vol.60, pp.7166-7169 [査読無し][通常論文]
  • 光機能材料マニュアル
    オプトロニクス社、1998 [査読無し][通常論文]

特許

  • 特願2013-036636:ガラス基体の成形方法、およびガラス成形体  2013年
    西井 準治  旭硝子(株)
  • 特願2013-076613:ガラス構造体の製造方法およびガラス構造体  2013年
    西井 準治  旭硝子(株)
  • 特願2013-178286:ガラス基板の処理方法  2013年
    西井 準治  旭硝子(株)
  • 特願2013-172426:ガラス基体の成形方法、およびガラス成形体  2013年
    西井 準治  旭硝子(株)
  • 特願2012-249337:ガラス基体の表面処理方法、およびガラス基体  2012年
    西井 準治  旭硝子(株)
  • 特願2012-197235:ガラス基体の表面処理方法、およびガラス基体  2012年
    西井 準治  旭硝子(株)
  • 特願2012-141139:ガラスの表面処理方法  2012年
    西井 準治  旭硝子(株)
  • 特願2012-067496:微細周期構造を有する炭化ケイ素モールド及びその製造方法  2008年
    西井 準治, 笠 晴也, 山田 和宏, 梅谷 誠, 森 登史晴  パナソニック(株)、コニカミノルタ(株)
  • 特願2007-010200:光学ガラス  2007年
    山下 直人, 末次 竜也, 栄西 俊彦, 西井 準治, 福味 幸平  五鈴精工ガラス(株)
  • 特願2007-178432:光学ガラス  2007年
    日高 達雄, 中村 淳一, 橋間 英和, 真弓 禎隆, 西井 準治  (独)産業技術総合研究所、日本山村硝子(株)
  • 特願2005-004814:光学多層膜素子  2005年
    陳 路, 西村 啓道, 西井 準治  岡本硝子(株)、(独)産業技術総合研究所
  • 特願2005-017795:光合分波素子およびそれを用いた光回路  2005年
    金高 健二, 西井 準治, 裏 升吾  (独)産業技術総合研究所
  • 特願2005-190943:光学用ガラス基板およびその製造方法  2005年
    北村 直之, 福味 幸平, 西井 準治  (独)産業技術総合研究所
  • 特願2005-243824:蛍光体ガラス材料  2005年
    北村 直之, 福味 幸平, 西井 準治  (独)産業技術総合研究所
  • 特願2002-215951:ドライエッチングによる微細加工用ガラス材料  2002年
    西井 準治, 金高 健二  (独)産業技術総合研究所
  • 回析格子の製造方法 (西井準治、山中 裕)
    特許第2832337号
  • Production Method of Diffraction Grating (J. Nishii, H. Yamanaka)
    US 5,716,762

受賞

  • 2021年09月 日本セラミックス協会 日本セラミックス協会 第34回秋季シンポジウム 若手奨励賞(ナノスケールセッション)
     
    受賞者: 小野 円佳;田邊 泰人;西井 準治;藤岡 正弥;メルバート ジェーム;小原 真司;赤塚 公章
  • 2019年11月 日本セラミックス協会 令和元年度 日本セラミックス協会 東北北海道?部研究発表会優秀ポスター賞
     希土類元素を含有するプロトン伝導リン酸塩ガラスの熱的安定性 
    受賞者: Fang Tong;Ren Yang;メルバート ジェーム;藤岡 正弥;小野 円佳;西井 準治
  • 2019年08月 日本材料科学会 Best Poster Award
     Experimental and Theoretical Study on Tunnel Magnetocapacitance in Fe/MgF2 Nanogranular Films. 
    受賞者: R. Msiska;S. Honjo;Y. Asai;M. Arita;A. T. Fukuchi;Y. Takahashi;N. Hoshino;T. Akutagawa;O. Kitakami;M. Fujioka;J. Nishii;H. Kaiju
  • 2018年11月 日本セラミックス協会 平成30年度日本セラミックス協会東北北海道支部研究発表会優秀発表賞
     固体電気化学を用いたトポタクティック反応によるAgxZrTe3の合成と超伝導の発現 
    受賞者: 佐藤 賢斗;藤岡 正弥;長尾 雅則;海住 英生;西井 準治
  • 2018年11月 日本セラミックス協会 平成30年度日本セラミックス協会東北北海道支部研究発表会優秀発表賞
     Nb添加リン酸塩ガラスにおける高プロトン伝導性の長時間維持 
    受賞者: 舘林 尭;Fang Xinxiong;藤岡 正弥;海住 英生;Zhao Gyaoyang;西井 準治
  • 2018年09月 日本材料科学会 日本材料科学会第4回マテリアルズ・インフォマティクス基礎研究会 講演最優秀賞
     磁性薄膜エッジを利用した分子ナノ接合素子の作製と電気磁気特性 
    受賞者: 佐々木 悠馬;Msiska Robin;三澤 貴浩;森 澄人;小峰 啓史;星野 哲久;芥川 智行;藤岡 正弥;西井 準治;海住 英生
  • 2018年09月 日本材料科学会 日本材料科学会第4回マテリアルズ・インフォマティクス基礎研究会 講演優秀賞
     Study on Tunnel Magnetocapacitance in Fe/MgF2 Nanogranular Films 
    受賞者: R. Msiska;S. Honjo;Y. Asai;M. Arita;A. T. Fukuchi;Y. Takahashi;N. Hoshino;T. Akutagawa;O. Kitakami;M. Fujioka;J. Nishii;H. Kaiju
  • 2018年01月 応用物理学会 第53回応用物理学会北海道支部/第14回日本光学会北海道支部合同学術講演会発表奨励賞
     薄膜エッジを利用したNi78Fe22/Alq3/Ni78Fe22ナノ接合の作製とその構造・電気伝導特性 
    受賞者: 佐々木 悠馬;三澤 貴浩;Msiska Robin;森 澄人;小峰 啓史;星野 哲久;芥川 智行;藤岡 正弥;西井 準治;海住 英生
  • 2017年03月 応用物理学会 第64回応用物理学会春季学術講演会Poster Award
     Inverse Tunnel Magnetocapacitance in Fe/Al-oxide/Fe3O4 
    受賞者: H. Kaiju;T. Nagahama;S. Sasaki;T. Shimada;O. Kitakami;T. Misawa;M. Fujioka;J. Nishii;G. Xiao
  • 2016年10月 日本セラミックス協会 平成28年度日本セラミックス協会東北北海道支部研究発表会優秀発表賞
     コロナ放電処理で作製したプロトン伝導ガラスの評価 
    受賞者: 木下 拓也;山口 拓哉;藤岡 正弥;海住 英生;小俣 孝久;西井 準治
  • 2016年09月 応用物理学会 第77回応用物理学会秋季学術講演会Poster Award
     薄膜エッジを利用したNi78Fe22/Alq3/Ni78Fe22ナノ接合の作製とその構造・電気伝導特性 
    受賞者: 三澤 貴浩;森 澄人;小峰 啓史;星野 哲久;芥川 智行;藤岡 正弥;海住 英生;西井 準治
  • 2016年07月 Materials Science Society of Japan The MSSJ Prize for the Presentation of an Excellent Paper (oral)
     Synthesis of Transition Metal-Based High-Tc Superconducting Micro-Wire Using Bio-Polymer 
    受賞者: I. Chelali;Y. Matsumoto;S. Kawaguchi;R. Sakagami;S. R. Hall;M. Matoba;H. Kaiju;J. Nishii;Y. Kamihara
  • 2016年01月 化学系学協会北海道支部 優秀講演賞(口頭部門)
     ランタノイド含有リン酸塩ガラスのアルカリ-プロトン置換による中温域プロトン伝導体の作製 
    受賞者: 宮崎 篤;山口 拓哉;海住 英生;小俣 孝久;西井 準治
  • 2015年06月 International Conference and Exhibition on Mesoscopic & Condensed Matter Physics Phenomenal and Worthy Presentation Award
     Nanoscale junctions utilizing magnetic thin-film edges 
    受賞者: H. Kaiju;J. Nishii
  • 2014年11月 日本セラミックス協会東北北海道支部 学生優秀発表賞
     コロナ放電処理による重ね合わせガラス間のアルカリイオン移動 
    受賞者: 川口 慶雅;海住 英生;西井 準治
  • 2014年04月 2014 Material Research Society Spring Meeting Best Poster Presentation Award
     Magnetic properties of spin quantum cross devices utilizing stray magnetic fields 
    受賞者: H. Kaiju;H. Kasa;T. Komine;T. Abe;T. Misawa;J. Nishii
  • 2013年12月 The 14th RIES-Hokudai International symposium ポスターアワード
     Plasmonic characteristics of palladium for hydrogen sensing 
    受賞者: T. Shibata;J. Nishii
  • 2012年11月 平成24年度日本セラミックス協会東北北海道支部研究発表会 優秀発表賞
     インプリント法を用いた長距離伝搬型プラズモン回折格子の作製 
    受賞者: 柴田 智広;池田 弘;西山 宏昭;西井 準治
  • 2012年02月 光産業振興協会 第27回櫻井健二郎氏記念賞
     ガラスナノインプリント法によるサブ波長構造デバイスの開発 
    受賞者: 西井準治
  • 2008年09月 日本光学会 光設計優秀賞
     ガラスモールド法によるレンズへの反射防止構造体形成技術 
    受賞者: 西井準治
  • 2007年10月 第13回Microoptics Conference 最優秀論文賞
     
    受賞者: 西井準治
  • 2004年06月 経済産業省 経済産業大臣賞
     ナノ構造制御、ナノ加工技術 
    受賞者: 西井準治
  • 2004年05月 日本セラミックス協会 最優秀論文賞
     シリカガラス表面の二次元反射防止構造 
    受賞者: 西井準治
  • 2004年 日本セラミックス協会 学術賞
     光機能性ガラスの開発とそのデバイス応用に関する研究 
    受賞者: 西井準治

共同研究・競争的資金等の研究課題

  • 光導波路

教育活動情報

主要な担当授業

  • 物質化学(ナノフォトニクス材料論)
    開講年度 : 2021年
    課程区分 : 修士課程
    開講学部 : 総合化学院
    キーワード : フォトニクス材料、フォトニクスデバイス、サプ波長光学、プラズモニクス、光波解析、微細加工技術、ナノ分光技術、電子顕微鏡解析
  • 環境と人間(1単位)
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 最先端技術、ナノテクノロジー、光科学、極微細技術、自己組織化、ナノ材料、半導体、高分子、超分子、フォトニクス、エレクトロニクス、レーザー、物理、化学、量子
  • 化学Ⅰ
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 全学教育
    キーワード : 原子の構造、原子軌道、化学結合、混成軌道、物質の三態、電解質溶液
  • ナノ物性化学
    開講年度 : 2021年
    課程区分 : 学士課程
    開講学部 : 理学部
    キーワード : 超伝導、ナノ空間、電子スピン、化学反応、選択性と統計性、数理科学、機械学習、情報理論、力学系

大学運営

学内役職歴

  • 2013年10月1日 - 2015年9月30日 教育研究評議会評議員
  • 2015年10月1日 - 2017年3月31日 教育研究評議会評議員
  • 2017年4月1日 - 2019年3月31日 研究戦略室室長
  • 2019年4月1日 - 2020年9月30日 研究戦略室室長
  • 2017年4月1日 - 2018年7月31日 国際連携機構副機構長
  • 2017年4月1日 - 2020年9月30日 産学・地域協働推進機構長
  • 2017年4月1日 - 2020年9月30日 創成研究機構長
  • 2017年4月1日 - 2020年9月30日 大学力強化推進本部副本部長
  • 2013年10月1日 - 2015年9月30日 電子科学研究所長
  • 2015年10月1日 - 2017年3月31日 電子科学研究所長


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