Yamane Keisaku

Faculty of Engineering　Applied Physics　Optical Science and TechnologyAssociate Professor
Last Updated :2025/11/06

■Researcher basic information

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Research Field

  • Natural sciences, Semiconductors, optical and atomic physics

Educational Organization

■Research activity information

Awards

  • May 2024, 一般社団法人レーザー学会, 第44回学術講演会年次大会優秀論文発表賞　　　　　　　　　　　　　　　
    和周波発生による周波数スイープパルス列生成を用いたsub-Gfpsシングルショットイメージング装置の開発
    爲本 龍汰;漕江 駿太;本田 亜沙美;山根 啓作;戸田 泰則;尾松 孝茂;森田 隆二

Papers

Other Activities and Achievements

Lectures, oral presentations, etc.

  • レーザー誘起前方転写におけるダブルパルス励起の効果　　　　　　　　　　　　　　　
    爲本 龍汰, 漕江 駿太, 佐藤 光太朗, 山根 啓作, 戸田 泰則, 尾松 孝茂, 森田 隆二
    第85回応用物理学会秋季学術講演会, 19 Sep. 2024, Japanese, Poster presentation
    16 Sep. 2024 - 20 Sep. 2024
  • Sub-Gfps burst imaging of initial process in optical vortex laser-induced forward transfer　　　　　　　　　　　　　　　
    Ryota Tamemoto, Syunta Kogie, Kotaro Sato, Keisaku Yamane, Yasunori Toda, Takashige Omatsu, Ryuji Morita
    The 23rd International Conference on Ultrafast Phenomena, 16 Jul. 2024, English, Poster presentation
    15 Jul. 2024 - 19 Jul. 2024
  • Snapshot visualization of initial process in laser-induced forward transfer　　　　　　　　　　　　　　　
    Ryota Tamemoto, Syunta Kogie, Kotaro Sato, Keisaku Yamane, Yasunori Toda, Takashige Omatsu, Ryuji Morita
    Optical Manipulation and Structured Materials Conference (OMC 2024), 24 Apr. 2024, English, Oral presentation
    22 Apr. 2024 - 26 Apr. 2024
  • 光渦パルスを用いた銅酸化物高温超伝導体擬ギャップの時空間制御　　　　　　　　　　　　　　　
    松本 和也, 清水 大成, 土屋 聡, 山根 啓作, 森田 隆二, 小田 研, 黒澤 徹, 戸田 泰則
    第71回応用物理学会春季学術講演会, 23 Mar. 2024, Japanese, Oral presentation
    22 Mar. 2024 - 25 Mar. 2024
  • ピコ秒域パルス列を用いた光渦レーザー誘起前方転写　　　　　　　　　　　　　　　
    山根 啓作, 爲本 龍汰, 佐藤 光太朗, 漕江 駿太, 戸田 泰則, 尾松 孝茂, 森田 隆二
    第71回応用物理学会春季学術講演会, 23 Mar. 2024, Japanese, Oral presentation
    22 Mar. 2024 - 25 Mar. 2024
  • 光渦レーザー誘起前方転写法における初期過程のスナップショットイメージング　　　　　　　　　　　　　　　
    爲本 龍汰, 漕江 駿太, 佐藤 光太朗, 山根 啓作, 戸田 泰則, 尾松 孝茂, 森田 隆二
    第71回応用物理学会春季学術講演会, 23 Mar. 2024, Japanese, Oral presentation
    22 Mar. 2024 - 25 Mar. 2024
  • トポロジカル光波の時空間制御とその応用展開　　　　　　　　　　　　　　　
    山根 啓作
    第2回超高速光エレクトロニクス研究会, 12 Mar. 2024, Japanese, Invited oral presentation
    12 Mar. 2024 - 12 Mar. 2024, [Invited]
  • Development of sub-Gfps singleshot imaging using generation of frequency-swept pulse train based on sum frequency generation　　　　　　　　　　　　　　　
    Ryota Tamemoto, Syunta Kogie, Asami Honda, Keisaku Yamane, Yasunori Toda, Omatsu Takashige, Ryuji Morita
    レーザー学会 第44回年次大会, 18 Jan. 2024, Japanese, Oral presentation
    16 Jan. 2024 - 19 Jan. 2024
  • Development of Spectroscopic Imaging System Based on Conversion of Polarization States for High Speed Burst Imaging　　　　　　　　　　　　　　　
    漕江駿太, 爲本龍汰, 本田亜沙美, 山根啓作, 戸田泰則, 尾松孝茂, 森田隆二
    Optics & Photonics Japan 2023, 27 Nov. 2023, Japanese, Oral presentation
    27 Nov. 2023 - 29 Nov. 2023
  • Generation of frequency-swept optical pulse train based on recirculation filtering of ultrafast optical pulses for sub-Gfps burst imaging　　　　　　　　　　　　　　　
    爲本龍汰, 漕江駿太, 本田亜沙美, 山根啓作, 戸田泰則, 尾松孝茂, 森田隆二
    Optics & Photonics Japan 2023, 27 Nov. 2023, Japanese, Oral presentation
    27 Nov. 2023 - 29 Nov. 2023
  • Spatio-temporal dynamics of localized superconductivity generated by optical vortex pulse　　　　　　　　　　　　　　　
    戸田泰則, 土屋聡, 山根啓作, 森田隆二, 小田研, 黒沢徹
    第84回応用物理学会秋季学術講演会, 23 Sep. 2023, Japanese, Oral presentation
    19 Sep. 2023 - 23 Sep. 2023
  • Generation of frequency-swept optical pulse train based on sum frequency generation for sub-Gfps snapshot imaging　　　　　　　　　　　　　　　
    Ryota Tamemoto, Asami Honda, Syunta Kogie, Keisaku Yamane, Masato Suzuki, Yasunori Toda, Takasige Omatsu, Ryuji Morita
    The 12th Asia-Pacific Laser Symposium(APLS 2023), 05 Sep. 2023, English, Oral presentation
    04 Sep. 2023 - 07 Sep. 2023
  • High definition 2-D print of gold microdots with light field possessing orbital angular momentum　　　　　　　　　　　　　　　
    甲斐清香, 川口晴生, 高橋幹太, WEI Rong, 山根啓作, 柚山健一, 川野聡恭, 森田隆二, 青木伸之, 青木伸之, 宮本克彦, 宮本克彦, 尾松孝茂, 尾松孝茂
    第70回応用物理学会春季学術講演会, 18 Mar. 2023, Japanese, Oral presentation
    15 Mar. 2023 - 18 Mar. 2023
  • Frequency-sweeping optical pulse train generation using asynchronous sum frequency generation in recirculation optical system　　　　　　　　　　　　　　　
    爲本龍汰, 本田亜沙美, 漕江駿太, 山根啓作, 鈴木雅人, 戸田泰則, 尾松孝茂, 尾松孝茂, 森田隆二
    第70回応用物理学会春季学術講演会, 17 Mar. 2023, Japanese, Oral presentation
    15 Mar. 2023 - 18 Mar. 2023
  • Spatio-temporal properties of superconductivity quenched by optical vortex pulse　　　　　　　　　　　　　　　
    尾上想一郎, 戸田泰則, 土屋聡, 山根啓作, 森田隆二, 小田研
    第70回応用物理学会春季学術講演会, 16 Mar. 2023, Japanese, Oral presentation
    15 Mar. 2023 - 18 Mar. 2023
  • Direct print of close-packed gold nanoparticle microdots with optical vortex illumination
    Haruki Kawaguchi, Kanta Takahashi, Rong Wei, Keisaku Yamane, Ken-ichi Yuyama, Satoyuki Kawano, Ryuji Morita, Nobuyuki Aoki, Katsuhiko Miyamoto, Takashige Omatsu
    Optical Manipulation and Structured Materials Conference (OMC 2022), 08 Dec. 2022, SPIE
    08 Dec. 2022 - 08 Dec. 2022
  • Generation of frequency-sweeping optical pulse train based on asynchronous sum frequency generation　　　　　　　　　　　　　　　
    爲本龍汰, 本田亜沙美, 山根啓作, 鈴木雅人, 戸田泰則, 尾松孝茂, 尾松孝茂, 森田隆二
    第83回応用物理学会秋季学術講演会, 23 Sep. 2022, Japanese, Oral presentation
    20 Sep. 2022 - 23 Sep. 2022
  • Ultrahigh-definition microdot printing of gold nanoparticles with optical vortex induced forward transfer　　　　　　　　　　　　　　　
    KAWAGUCHI Haruki, TAKAHASHI Kanta, WEI Rong, YAMANE Keisaku, MORITA Ryuji, YUYAMA Ken-ichi, KAWANO Satoyuki, MIYAMOTO Katsuhiko, MIYAMOTO Katsuhiko, AOKI Nobuyuki, AOKI Nobuyuki, OMATSU Takashige, OMATSU Takashige
    第83回応用物理学会秋季学術講演会, 23 Sep. 2022, English, Oral presentation
    20 Sep. 2022 - 23 Sep. 2022
  • Ultrafast spatial mode modulation by using chirped pulses of structured light　　　　　　　　　　　　　　　
    MORITA Ryuji, YAMANE Keisaku, SUZUKI Masato
    JSAP-Optica-SPP Joint Symposia 2022, 21 Sep. 2022, English, Invited oral presentation
    20 Sep. 2022 - 23 Sep. 2022
  • Coherent quench of superconducting state using optical vortex pulses
    Y. Toda, S. Tsuchiya, K. Yamane, R. Morita, M. Oda, T. Mertelj, D. Mihailovic
    The 15th Pacific Rim Conference on Lasers and Electro-Optics (CLEO Pacific Rim, CLEO-PR 2022), 02 Aug. 2022, Optica Publishing Group, English, Oral presentation
    31 Jul. 2022 - 05 Aug. 2022
  • Ultrafast snapshot imaging at sub-GHz framerate by using recirculation filtering of ultrashort optical pulses
    Asami Honda, Ryota Tamemoto, Keisaku Yamane, Masato Suzuki, Yasunori Toda, Takashige Omatsu, Ryuji Morita
    The 15th Pacific Rim Conference on Lasers and Electro-Optics (CLEO Pacific Rim, CLEO-PR 2022), 01 Aug. 2022, English, Oral presentation
    31 Jul. 2022 - 05 Aug. 2022
  • トポロジカル光波の生成と評価　　　　　　　　　　　　　　　
    鈴木 雅人, 山根 啓作
    第4回超高速光エレクトロニクス研究会, 21 Jun. 2022, Japanese, Invited oral presentation
    21 Jun. 2022 - 21 Jun. 2022, [Invited]
  • Development of sub-Gfps ultrafast snapshot imaging system based on recirculation filtering of ultrashort optical pulses
    Asami Honda, Keisaku Yamane, Masato Suzuki, Jin Kawaguchi, Yasunori Toda, Takashige Omatsu, Ryuji Morita
    Conference on Lasers and Electro-Optics, CLEO 2022, 19 May 2022, English, Oral presentation
    15 May 2022 - 20 May 2022
  • Ultrahigh-precision micro-patterning of gold dots with optical vortex induced forward transfer　　　　　　　　　　　　　　　
    TAKAHASHI Kanta, KAWAGUCHI Haruki, WEI Rong, YAMANE Keisaku, YUYAMA Ken-ichi, MIYAMOTO Katsuhiko, MIYAMOTO Katsuhiko, OMATSU Takashige, OMATSU Takashige
    Optics & Photonics Japan講演予稿集(CD-ROM), 2022
    2022 - 2022
  • Total Angular Momentum Effects in Optical Vortex Induced Gold Nanoparticles Forward Transfer　　　　　　　　　　　　　　　
    WEI Rong, 川口晴生, 山根啓作, 柚山健一, 川野聡恭, 森田隆二, 青木伸之, 青木伸之, 宮本克彦, 宮本克彦, 尾松孝茂, 尾松孝茂
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 2022
    2022 - 2022
  • Direct Optical Vortex Laser Printing of a Microdot with Close-Packed and Sintered Gold Nanoparticles
    Haruki Kawaguchi, Rong Wei, Keisaku Yamane, Ken-ichi Yuyama, Satoyuki Kawano, Ryuji Morita, Kohei Toyoda, Katsuhiko Miyamoto, Takashige Omatsu
    Conference on Lasers and Electro-Optics, 2022, Optica Publishing Group
    2022 - 2022, We demonstrate the direct printing of an ultrafine microdot formed of gold nanoparticles by employing optical vortex laser induced forward transfer. Spin and orbital angular momentum induces the close-packing and sintering of gold nanoparticles.
  • Photoinduced coherent quenching of superconductivity using optical vortex pulses　　　　　　　　　　　　　　　
    戸田泰則, 山岡利盛, 土屋聡, 山根啓作, 森田隆二, 小田研
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 2022, Japanese, Oral presentation
    2022 - 2022
  • Vortex Airy beam realized by superposition of two Airy beams
    Masato Suzuki, Keisaku Yamane, Takashige Omatsu, Ryuji Morita
    The 2021 Frontiers in Optics and Laser Science Conference, 01 Nov. 2021, English, Oral presentation
    01 Nov. 2021 - 04 Nov. 2021
  • Diffraction Property of Optical Vortex Arrays Using Topological Defects in Nematic Liquid crystals　　　　　　　　　　　　　　　
    佐々木裕司, 村上尚史, 山根啓作, 折原宏
    日本物理学会2021年秋季大会, 20 Sep. 2021, Japanese, Oral presentation
    20 Sep. 2021 - 23 Sep. 2021
  • Proposal of new-type vortex Airy beam with improved propagation characteristics
    Masato Suzuki, Keisaku Yamane, Takashige Omatsu, Ryuji Morita
    JSAP-OSA Joint Symposia 2021, 26 Aug. 2021, English, Oral presentation
    26 Aug. 2021 - 26 Aug. 2021
  • 光渦の軌道角運動量分解精度向上のための偏光回折素子光学系開発　　　　　　　　　　　　　　　
    飯塚 健介, 山根 啓作, 川村 一貴, 坂本 盛嗣, 小野 浩司, 岡 和彦, 戸田 泰則, 森田 隆二
    第６８回応用物理学会春季学術講演会, 16 Mar. 2021, Oral presentation
    16 Mar. 2021 - 19 Mar. 2021
  • 偏光回折素子を用いた光波複製による軌道角運動量分解精度の向上　　　　　　　　　　　　　　　
    飯塚 健介, 山根 啓作, 坂本 盛嗣, 小野 浩司, 岡 和彦, 本田 亜沙美, 鈴木 雅人, 戸田 泰則, 森田 隆二
    レーザー学会 第41回年次大会, 18 Jan. 2021, Japanese, Oral presentation
    18 Jan. 2021 - 20 Jan. 2021
  • Creation of hexagonal close-packed photonic-ring with optical vortex　　　　　　　　　　　　　　　
    TAKAHASHI Kanta, KAWAGUCHI Haruki, UMESATO Kei, ARITA Yoshihiko, ARITA Yoshihiko, YAMANE Keisaku, MORITA Ryuji, YUYAMA Ken-ichi, KAWANO Satoyuki, MIYAMOTO Katsuhiko, OMATSU Takashige
    International Conference on Simulation Technology (CD-ROM), 2021
    2021 - 2021
  • Optical vortex induced forward transfer of a single octahedral Au nanoparticle　　　　　　　　　　　　　　　
    KAWAGUCHI Haruki, WEI Rong, YAMANE Keisaku, MORITA Ryuji, YUYAMA Ken-ichi, KAWANO Satoyuki, MIYAMOTO Katsuhiko, TORIMOTO Tsukasa, OMATSU Takashige
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 2021
    2021 - 2021
  • Optical vortex induced hexagonal close-packed photonic-microring　　　　　　　　　　　　　　　
    TAKAHASHI Kanta, KAWAGUCHI Haruki, UMESATO Kei, ARITA Yoshihiko, ARITA Yoshihiko, YAMANE Keisaku, MORITA Ryuji, YUYAMA Ken-ichi, KAWANO Satoyuki, MIYAMOTO Katsuhiko, OMATSU Takashige
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 2021
    2021 - 2021
  • Optical vortex induced gold nanoparticles forward transfer　　　　　　　　　　　　　　　
    川口晴生, 梅里慧, 高橋幹太, 山根啓作, 柚山健一, 川野聡恭, 森田隆二, 宮本克彦, 宮本克彦, 尾松孝茂, 尾松孝茂
    Optics & Photonics Japan講演予稿集(CD-ROM), 2021, Japanese, Oral presentation
    2021 - 2021
  • Experimental course using an online programing environment　　　　　　　　　　　　　　　
    友田基信, 山崎憲慈, 柏本史郎, 田中之博, 佐々木裕司, 山根啓作
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 2021, Japanese, Oral presentation
    2021 - 2021
  • Plasmonic Nano-Core Formation with Optical Vortex Laser Induced Forward Transfer　　　　　　　　　　　　　　　
    川口晴生, 梅里慧, 高橋幹太, 柚山健一, 山根啓作, 宮本克彦, 尾松孝茂
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 2021, Japanese, Oral presentation
    2021 - 2021
  • カイラル変調分光を目的とする分割型デフォーマブルミラーを用いた光渦生成　　　　　　　　　　　　　　　
    下田隆一, 土屋聡, 山根啓作, 森田隆二, 戸田泰則
    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, 2021
    2021 - 2021
  • 空間変調光帰還型面発光レーザーのOAMモード発振制御　　　　　　　　　　　　　　　
    仲川幸輝, 山根啓作, 森田隆二, 戸田泰則
    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, 2021
    2021 - 2021
  • Ultrafast azimuth rotation of linearly polarized beam by use of a chirped optical pulse pair
    Rin Sasaki, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda, Takashige Omatsu, Ryuji Morita
    Optical Manipulation and Structured Materials Conference (OMC 2020), 23 Apr. 2020, English, Oral presentation
    20 Apr. 2020 - 23 Apr. 2020
  • High-precision orbital-angular-momentum decomposition system with polarization gratings　　　　　　　　　　　　　　　
    渡辺悠歩, 山根啓作, 坂本盛嗣, 小野浩司, 岡和彦, 戸田泰則, 森田隆二
    第67回応用物理学会春季学術講演会, 13 Mar. 2020, Japanese, Oral presentation
    12 Mar. 2020 - 15 Mar. 2020
  • 高次横モード光励起を用いた面発光レーザーの光渦発振特性　　　　　　　　　　　　　　　
    仲川幸輝, 山根啓作, 森田隆二, 戸田泰則
    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, 2020
    2020 - 2020
  • ガラス上のレーザー誘起表面周期構造形成のための繰り返し周波数可変超短光パルスファイバーレーザーの構築　　　　　　　　　　　　　　　
    辻亮, 山根啓作, 望月克, 戸田泰則, 森田隆二
    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, 2020
    2020 - 2020
  • 時空間制御光波発生のための高繰り返しファイバーレーザーの構築
    島谷航平, 山根啓作, 戸田泰則, 森田隆二
    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, 05 Jan. 2019, Japanese
    05 Jan. 2019 - 05 Jan. 2019
  • 二光子吸収誘起表面レリーフ形成過程におけるスピン軌道相互作用　　　　　　　　　　　　　　　
    篠崎諒, 増田圭吾, 杵塚義典, 一條瑞樹, 倉元佑樹, 山根啓作, 宮本克彦, 宮本克彦, 尾松孝茂, 尾松孝茂
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 2019
    2019 - 2019
  • OAMモード分解精度向上のための低損失ビーム整形素子の開発　　　　　　　　　　　　　　　
    渡辺悠歩, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 2019
    2019 - 2019
  • 高効率な時空間制御光波発生装置の開発　　　　　　　　　　　　　　　
    岩佐康平, 佐々木凜, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 2019
    2019 - 2019
  • 光渦の二光子吸収によって形成されたキラル表面レリーフ　　　　　　　　　　　　　　　
    篠崎諒, 増田圭吾, 一條瑞樹, 山根啓作, 宮本克彦, 宮本克彦, 尾松孝茂, 尾松孝茂
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 2019
    2019 - 2019
  • 空間変調光帰還型面発光レーザーのOAMモード偏光特性　　　　　　　　　　　　　　　
    仲川幸輝, 山根啓作, 森田隆二, 戸田泰則
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 2019
    2019 - 2019
  • Study on intensity profile correction in orbital angular momentum decomposition of optical vortices based on geometrical transformation in optics
    脇坂勇武, 渡辺悠歩, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    Optics & Photonics Japan講演予稿集(CD-ROM), 24 Oct. 2018, Japanese
    24 Oct. 2018 - 24 Oct. 2018
  • チャネルドスペクトルによる分光偏光計
    岡和彦, 坂本盛嗣, 山根啓作, 森田隆二
    精密工学会大会学術講演会講演論文集, 05 Sep. 2018, Japanese
    05 Sep. 2018 - 05 Sep. 2018
  • チャープパルス対を利用した直線偏光の偏光方位のsub‐THz域超高速回転
    佐々木凜, 岩佐康平, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 05 Sep. 2018, Japanese
    05 Sep. 2018 - 05 Sep. 2018
  • 光渦の軌道角運動量分解精度向上のための光波複製光学系の開発
    渡辺悠歩, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 05 Sep. 2018, Japanese
    05 Sep. 2018 - 05 Sep. 2018
  • Development of OAM sorter based on geometric transformation in optics
    山根啓作, 脇坂勇武, 渡辺悠歩, 岡和彦, 戸田泰則, 森田隆二
    電子情報通信学会技術研究報告, 05 Jul. 2018, Japanese
    05 Jul. 2018 - 05 Jul. 2018
  • Coherent Spectroscopy of GaN Excitons by Using Vortex Pulses
    戸田泰則, 重松恭平, 山根啓作, 森田隆二
    レーザー研究, 20 Apr. 2018, Japanese
    20 Apr. 2018 - 20 Apr. 2018
  • 偏光における幾何学的位相を利用した軌道角運動量分解素子の開発
    山根啓作, 渡辺悠歩, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 05 Mar. 2018, Japanese
    05 Mar. 2018 - 05 Mar. 2018
  • 自己参照型干渉法を用いた光渦の小型軌道角運動量分解装置の構築
    住吉祥伍, 山根啓作, 戸田泰則, 森田隆二
    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, 06 Jan. 2018, Japanese
    06 Jan. 2018 - 06 Jan. 2018
  • 光渦により公転運動させたミクロ粒子の回転ドップラー計測
    坪谷春輝, 司馬哲裕, 山根啓作, 戸田泰則, 森田隆二
    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, 06 Jan. 2018, Japanese
    06 Jan. 2018 - 06 Jan. 2018
  • ポアンカレビームパルスを用いたGaN励起子の四光波混合分光
    内古閑隆太郎, 山根啓作, 森田隆二, 戸田泰則
    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, 06 Jan. 2018, Japanese
    06 Jan. 2018 - 06 Jan. 2018
  • Spatio-temporal control of light waves
    山根啓作, 森田隆二
    Optics & Photonics Japan講演予稿集(CD-ROM), 16 Oct. 2017, Japanese
    16 Oct. 2017 - 16 Oct. 2017
  • トポロジカル光波の発生・計測技術
    山根啓作
    電子情報通信学会大会講演論文集(CD-ROM), 29 Aug. 2017, Japanese
    29 Aug. 2017 - 29 Aug. 2017
  • 光渦パルス励起による超伝導準粒子軌道角運動量ダイナミクス観測
    望月洋人, 戸田泰則, 土屋聡, 山根啓作, 森田隆二, 黒沢徹, 小田研
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 25 Aug. 2017, Japanese
    25 Aug. 2017 - 25 Aug. 2017
  • 空間変調光帰還型面発光レーザーのOAMモード発振特性
    森谷淳史, 戸田泰則, 山根啓作, 森田隆二, 重松恭平, 淡路祥成
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 25 Aug. 2017, Japanese
    25 Aug. 2017 - 25 Aug. 2017
  • sub‐mJ級超高速回転リング状光格子の発生
    岩佐康平, 柿澤康平, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 25 Aug. 2017, Japanese
    25 Aug. 2017 - 25 Aug. 2017
  • 高強度・超高速回転リング状光格子の発生
    柿澤康平, 岩佐康平, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 01 Mar. 2017, Japanese
  • 幾何学的変換に基づく光渦の高精度軌道角運動量分解計測
    山根啓作, 戸田泰則, 森田隆二
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 01 Mar. 2017, Japanese
  • 軸対称偏光素子を用いたトラップ粒子の回転制御(II)
    小原威吹, 坂本盛嗣, 山根啓作, 森田隆二, 岡和彦
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 01 Mar. 2017, Japanese
  • 光渦の干渉パターンを用いた微小粒子の回転制御
    小原威吹, 坂本盛嗣, 山根啓作, 森田隆二, 岡和彦
    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, 07 Jan. 2017, Japanese
  • Single orbital angular momentum mode emission from vertical cavity surface emitting laser by optical feedback
    Y. Toda, H. Moriya, K. Shigematsu, K. Yamane, R. Morita, Y. Awaji
    Proceedings of SPIE - The International Society for Optical Engineering, 01 Jan. 2017
    © 2017 SPIE. Single angular momentum (OAM) mode emissions from a vertical cavity surface emitting laser (VCSEL) were demonstrated by an external optical feedback using computer generated holograms, which are optimized on the OAM modal gain of the free-running VCSEL. Side-mode suppression ratio of more than 23 dB was achieved for the OAM modes with ℓ = ±1.
  • Generation of intense ultrafast-rotating ring-shaped optical lattices with programmable control of rotational symmetry
    Keisaku Yamane, Kohei Iwasa, Kohei Kakizawa, Kazuhiko Oka, Yasunori Toda, Ryuji Morita
    Proceedings of SPIE - The International Society for Optical Engineering, 01 Jan. 2017
    © 2017 SPIE. A new method for the ultrafast rotation of ring-shaped optical lattices based on frequency-chirping of optical pulses was demonstrated in THz regime, which is three orders of magnitude faster than those by the conventional methods. Our optical lattice generator with a spatial light modulator is robust thanks to the 4-f configuration and enables us to flexibly control their rotational symmetry. The generated ultrafast-rotating ring-shaped optical lattices with a rotational frequency of 0.59 THz were successfully boosted from 5 μJ up to 125 μJ by using a home-built 4-pass Ti:sapphire amplifier without any limitation by optical damage to the spatial light modulator.
  • ポアンカレビームパルスを用いたGaN励起子スピンのコヒーレントダイナミクス観測
    内古閑隆太郎, 重松恭平, 山根啓作, 森田隆二, 戸田泰則
    日本物理学会講演概要集(CD-ROM), 23 Sep. 2016, Japanese
  • 光渦パルスのチャープ特性を利用したプログラマブル超高速回転リング状光格子の生成
    柿澤康平, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会秋季学術講演会講演予稿集(CD-ROM), 01 Sep. 2016, Japanese
  • 空間変調光注入同期による面発光レーザーのトポロジカルチャージ制御
    西坂拓馬, 重松恭平, 山根啓作, 山根啓作, 森田隆二, 森田隆二, 淡路祥成, 戸田泰則, 戸田泰則
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 03 Mar. 2016, Japanese
  • 軸対称偏光子を用いたトラップ粒子の回転制御
    小原威吹, 坂本盛嗣, 山根啓作, 森田隆二, 岡和彦
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 03 Mar. 2016, Japanese
  • チャープパルスを用いた直線偏光の偏光方位の超高速回転
    永井美祐, 坂本盛嗣, 坂本盛嗣, 山根啓作, 森田隆二, 岡和彦
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 03 Mar. 2016, Japanese
  • 光渦によって形成される単結晶性シリコンニードルのパルス幅依存性
    藤原穂波, 高橋冬都, 泉澤魁, 比田井洋史, 宮本克彦, 山根啓作, 森田隆二, 尾松孝茂
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 03 Mar. 2016, Japanese
  • 拡張ストークスパラメータにおける拡張偏光度スペクトルを用いた光波の空間回転対称性解析の検討
    鈴木雅人, 山根啓作, 岡和彦, 戸田泰則, 森田隆二
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 03 Mar. 2016, Japanese
  • 時空間分解偏光解析から明らかとなった励起子コヒーレントダイナミクスにおける回転対称性破れ
    重松恭平, 鈴木雅人, 山根啓作, 森田隆二, 戸田泰則
    応用物理学会春季学術講演会講演予稿集(CD-ROM), 03 Mar. 2016, Japanese
  • Comment on "Higher Order Pancharatnam-Berry Phase and the Angular Momentum of Light"
    Masato Suzuki, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda, Ryuji Morita
    08 Feb. 2016
    08 Feb. 2016 - 08 Feb. 2016, In a recent letter, Milione et al. reported the Pancharatnam-Berry phase

    (PBP) on a higher-order Poincar\'e sphere (HOPS) [Phys. Rev. Lett, 108, 190401

    (2012)]. They used two spin-orbit converters (SOCs) to make a trajectory along

    the HOPS. However, the SOCs actually do not make a path on the HOPS. We briefly

    discuss a way of acquiring a PBP made by SOCs.
  • 空間変調光帰還による面発光レーザーのラゲールガウスモード制御
    西坂拓馬, 重松恭平, 由利洋樹, 山根啓作, 山根啓作, 森田隆二, 森田隆二, 淡路祥成, 戸田泰則, 戸田泰則
    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, 09 Jan. 2016, Japanese
    09 Jan. 2016 - 09 Jan. 2016
  • パルス幅可変光渦を用いたナノニードル形成とそのメカニズムに関する研究
    里水里, 山根啓作, 山根啓作, 戸田泰則, 戸田泰則, 森田隆二, 森田隆二
    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, 09 Jan. 2016, Japanese
  • 超微細加工のための高強度・高繰り返しYb:YAG超短光パルスレーザーの構築
    角田恵一郎, 山根啓作, 山根啓作, 戸田泰則, 戸田泰則, 森田隆二, 森田隆二
    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, 09 Jan. 2016, Japanese
  • Quantitative characterization of polarization states of axisymmetrically polarized pulses generated by coherent beam combining
    Masato Suzuki, Keisaku Yamane, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda, Yasunori Toda, Ryuji Morita, Ryuji Morita
    Conference on Lasers and Electro-Optics Europe - Technical Digest, 10 Aug. 2015
    © 2015 OSA. By using the extended Stokes parameters and the degree of polarization defined for the spatial distribution (DOP-SD), we fully quantitatively characterize the polarization states of arbitrary (DOP-SD>0.96) axisymmetrically-polarized femtosecond pulses generated by coherent beam combining.
  • 21pCP-4 Four-wave mixing spectroscopy using cylindrically polarized pulses for exciton fine structure in GaN
    Shigematsu K, Morimoto S, Suzuki M, Yamane K, Morita R, Toda Y
    日本物理学会講演概要集, 21 Mar. 2015, Japanese
  • 21pCP-4 Four-wave mixing spectroscopy using cylindrically polarized pulses for exciton fine structure in GaN
    Shigematsu K, Morimoto S, Suzuki M, Yamane K, Morita R, Toda Y
    Meeting Abstracts of the Physical Society of Japan, 2015, Japanese
  • Quantitative characterization of polarization states of axisymmetrically polarized pulses generated by coherent beam combining
    Masato Suzuki, Keisaku Yamane, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda, Yasunori Toda, Ryuji Morita, Ryuji Morita
    CLEO: Science and Innovations, CLEO-SI 2015, 01 Jan. 2015
    By using the extended Stokes parameters and the degree of polarization defined for the spatial distribution (DOP-SD), we fully quantitatively characterize the polarization states of arbitrary (DOP-SD>0.96) axisymmetrically-polarized femtosecond pulses generated by coherent beam combining. © 2014 Optical Society of America.
  • Fractional optical vortex parametric oscillator
    YUSUFU TAXIMAITI, ABULIKEMU AIZITIAILI, YAMANE KEISAKU, MIYAMOTO KATSUHIKO, OMATSU TAKASHIGE
    Optics & Photonics Japan講演予稿集(CD-ROM), 24 Oct. 2014, English
  • Eigenmode expansion of optical vortices based on electric-field reconstruction in spatial domain
    Keisaku Yamane, Keisaku Yamane, Shota Nakajima, Masato Suzuki, Masato Suzuki, Yasunori Toda, Yasunori Toda, Ryuji Morita, Ryuji Morita
    Optics InfoBase Conference Papers, 21 Jul. 2014
  • Quantitative analysis of l = 2 radially polarized ultrashort pulses by using extended stokes parameters
    Masato Suzuki, Keisaku Yamane, Keisaku Yamane, Kazuhiko Oka, Yasunori Toda, Yasunori Toda, Ryuji Morita, Ryuji Morita
    Optics InfoBase Conference Papers, 21 Jul. 2014
  • Coherent dynamics of uniaxially-strained GaN excitons excited by cylindrically polarized pulses
    K. Shigematsu, S. Morimoto, M. Suzuki, K. Yamane, K. Yamane, R. Morita, R. Morita, Y. Toda, Y. Toda
    Optics InfoBase Conference Papers, 21 Jul. 2014
  • Generation of the ring-shaped optical lattice using axially-symmetric polarization elements (II)
    Moritsugu Sakamoto, Keisaku Yamane, Keisaku Yamane, Naoshi Murakami, Ryuji Morita, Ryuji Morita, Kazuhiko Oka
    Frontiers in Optics, FiO 2014, 01 Jan. 2014
    © 2014 Optical Society of America.A novel optical system of a ring-shaped optical-lattice generator using axially-symmetric polarization elements is presented. A series of axially-symmetric polarization elements incorporated into the configuration enables generating any combination of vortices with even-numbered topolog-ical charges.
  • Generation of ultra-broadband pulses with axially-symmetric polarization based on coherent beam combining of optical vortices
    Keisaku Yamane, Yasuyuki Shioda, Masato Suzuki, Yasunori Toda, Ryuji Morita
    Conference on Lasers and Electro-Optics Europe - Technical Digest, 01 Jan. 2014
    © 2014 Optical Society of America.We demonstrated the generation of ultra-broadband optical pulses with axiallysymmetric polarization, on the basis of a coherent beam combining technique. The high polarization purity (∼95 %) ranging from 750 to 880 nm was obtained.
  • Generation of ultra-broadband pulses with axially-symmetric polarization based on coherent beam combining of optical vortices
    Keisaku Yamane, Yasuyuki Shioda, Masato Suzuki, Yasunori Toda, Ryuji Morita
    Optics InfoBase Conference Papers, 01 Jan. 2014
    We demonstrated the generation of ultra-broadband optical pulses with axiallysymmetric polarization, on the basis of a coherent beam combining technique. The high polarization purity (~95 %) ranging from 750 to 880 nm was obtained. © 2014 Optical Society of America.
  • Spatiotemporal coherence of GaN excitons excited by an optical vortex with multiple orbital angular momentum
    Kyohhei Shigematsu, Keisaku Yamane, Keisaku Yamane, Ryuji Morita, Ryuji Morita, Yasunori Toda, Yasunori Toda
    Optics InfoBase Conference Papers, 01 Jan. 2014
    The spatiotemporal coherence of excitons is investigated by degenerate four-wavemixing using optical vortices with multiple orbital angular momentum (OAM). The OAMresolved signal indicates that the topological phase with large OAM is robust against spatial decoherence. © 2014 OSA.
  • Ultrafast and ultra-broadband optical-vortex pulse generation and characterization
    Ryuji Morita, Ryuji Morita, Keisaku Yamane, Keisaku Yamane, Zhili Yang, Yasunori Toda, Yasunori Toda
    Proceedings of SPIE - The International Society for Optical Engineering, 01 Jan. 2014
    Subsequently to the previous generation of ultrashort and ultra-broadband optical-vortex (OV) pulses (pulse energy: several tens of μJ) in few-cycle regime, we demonstrate high-power OV pulse generation with topological charge flexibility by employing a 4-f OV converter and pre- and main-amplifications. Our configuration overcomes the low-throughput drawback of the vortex converter, simultaneously compensating for the angular dispersion. It also gives flexibility of OAMor topological-charge control. Thus, we succeed in generation of mJ-class ultra-broadband OV pulses (∼790-∼820 nm) with a programmably-controlled topological charge. Moreover, we experimentally exhibit a high-precision method for measuring frequency-resolved OAM spectrum of femtosecond ultra-broadband OV pulses on the basis of electric-field reconstruction in the spatial domain. In addition, we present the generation of ultrashort pulses with axially-symmetric polarization by coherent beam combining of OVs.
  • Over 1-mJ intense ultrashort optical-vortex pulse generation with programmable topological-charge control by chirped-pulse amplification
    Keisaku Yamane, Asami Honda, Yasunori Toda, Ryuji Morita
    Optics InfoBase Conference Papers, 01 Jan. 2014
    We demonstrated the generation of over 1-mJ intense optical-vortex pulses of which topological charges were programmably controlled by computer-generated holograms. The pulse duration was characterized to be 27 fs by two-dimensional spectral shearing interferometry. © 2014 OSA.
  • Spatiotemporal coherence of GaN excitons excited by an optical vortex with multiple orbital angular momentum
    Kyohhei Shigematsu, Keisaku Yamane, Keisaku Yamane, Ryuji Morita, Ryuji Morita, Yasunori Toda, Yasunori Toda
    Conference on Lasers and Electro-Optics Europe - Technical Digest, 01 Jan. 2014
    © 2014 Optical Society of America. The spatiotemporal coherence of excitons is investigated by degenerate four-wavemixing using optical vortices with multiple orbital angular momentum (OAM). The OAMresolved signal indicates that the topological phase with large OAM is robust against spatial decoherence.
  • Nonlinear conversion between ultrashort radially-and azimuthally-polarized pulses in an anisotropic media
    Masato Suzuki, Keisaku Yamane, Keisaku Yamane, Yasunori Toda, Yasunori Toda, Ryuji Morita, Ryuji Morita
    Optics InfoBase Conference Papers, 01 Dec. 2013
  • Amplification of ultrashort optical-vortex pulses with programmable topological-charge control
    Keisaku Yamane, Yasunori Toda, Ryuji Morita
    CLEO: QELS_Fundamental Science, CLEO:QELS FS 2013, 21 Nov. 2013
    We demonstrate the amplification of ultrashort optical-vortex pulses through the optical parametric process, where optical-vortex seed pulses with computer-controlled topological charges are employed. In this scheme, the low-throughput drawback of the vortex converter is overcome. © 2013 Optical Society of America.
  • Quasi-real-time measurement of orbital angular momentum spectra of ultra-broadband optical vortices from fork-like interferograms
    Zhili Yang, Keisaku Yamane, Yasunori Toda, Ryuji Morita
    CLEO: QELS_Fundamental Science, CLEO:QELS FS 2013, 21 Nov. 2013
    We experimentally demonstrate a simple and high-precision method for measuring orbital angular momentum (OAM) spectra of femtosecond ultra-broadband optical-vortex pulses from fork-like interferograms. This method enables quasi-real-time OAM measurement for ultrashort or ultra-broadband optical vortices. © OSA 2013.
  • Amplification of ultrashort optical-vortex pulses with programmable topological-charge control
    Keisaku Yamane, Yasunori Toda, Ryuji Morita
    CLEO: Applications and Technology, CLEO_AT 2013, 19 Nov. 2013
    We demonstrate the amplification of ultrashort optical-vortex pulses through the optical parametric process, where optical-vortex seed pulses with computer-controlled topological charges are employed. In this scheme, the low-throughput drawback of the vortex converter is overcome. © 2013 Optical Society of America.
  • Amplification of ultrashort optical-vortex pulses with programmable topological-charge control
    Keisaku Yamane, Yasunori Toda, Ryuji Morita
    CLEO: Science and Innovations, CLEO_SI 2013, 18 Nov. 2013
    We demonstrate the amplification of ultrashort optical-vortex pulses through the optical parametric process, where optical-vortex seed pulses with computer-controlled topological charges are employed. In this scheme, the low-throughput drawback of the vortex converter is overcome. © 2013 Optical Society of America.
  • Programmable ultrashort optical-vortex pulse generation using optical parametric amplification and 4-f configuration
    Keisaku Yamane, Asami Honda, Kyohhei Shigematsu, Yasunori Toda, Ryuji Morita
    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest, 18 Oct. 2013
    We demonstrate the optical parametric amplification of optical-vortex pulses with the programmable topological-charge control. Combination of optical-parametric amplification and 4-f configuration overcomes the low-throughput drawback of the vortex converter, simultaneously compensating for the angular dispersion. © 2013 IEEE.
  • Nonlinear coupling between radially-and azimuthally-polarized modes of ultrashort optical pulses in an anisotropic crystal
    Masato Suzuki, Keisaku Yamane, Keisaku Yamane, Yasunori Toda, Yasunori Toda, Ryuji Morita, Ryuji Morita
    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest, 18 Oct. 2013
    We investigate nonlinear propagation of ultrashort optical pulses with radially-and azimuthally-polarized modes in a uniaxial crystal. The energy exchange between the modes, ascribed to nonlinear four-wave-mixing effect with Gouy-phase shifts, is discussed. © 2013 IEEE.
  • Orbital angular momentum dynamics of excitons excited with multiple optical vortices
    Shigematsu K, Toda Y, Yamane K, Morita R
    Meeting abstracts of the Physical Society of Japan, 26 Aug. 2013, Japanese
  • Frequency-resolved Orbital Angular Momentum Spectrum Measurement of Ultra-broadband Optical Vortices　　　　　　　　　　　　　　　
    2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR), 2013
  • Amplification of ultrashort optical-vortex pulses with programmable topological-charge control
    Keisaku Yamane, Yasunori Toda, Ryuji Morita
    2013 Conference on Lasers and Electro-Optics, CLEO 2013, 01 Jan. 2013
    We demonstrate the amplification of ultrashort optical-vortex pulses through the optical parametric process, where optical-vortex seed pulses with computer-controlled topological charges are employed. In this scheme, the low-throughput drawback of the vortex converter is overcome. © 2013 The Optical Society.
  • Nonlinear conversion between ultrashort radially- and azimuthally-polarized pulses in an anisotropic media
    Masato Suzuki, Keisaku Yamane, Keisaku Yamane, Yasunori Toda, Yasunori Toda, Ryuji Morita, Ryuji Morita
    2013 Conference on Lasers and Electro-Optics Europe and International Quantum Electronics Conference, CLEO/Europe-IQEC 2013, 01 Jan. 2013
    A radially- or azimuthally-polarized mode is one of the axially-polarized modes, changing its local polarization state as a function of the azimuthal angle. It can be expressed by a superposition of the left-circularly polarized (LCP; s = +1: spin angular momentum (SAM) of light) l= - 1 optical vortex and the right-circularly polarized (RCP;s= - 1) l = + 1 optical vortex. Here, the term optical vortex simply refers to a Laguerre-Gaussian mode with a zero-radial index. l is an orbital angular momentum (OAM) of light per photon in h ̄ units which causes the phase ramp around the phase singular point [1]. In a beam propagating along the optic axis of a uniaxial crystal, the crystal anisotropy induces its SAM conversion between s = +1 and s = - 1 states under the conservation of total angular momentum s +l. Thus, a uniaxial crystal is used for high-power generation of s= - 1, l = 2 optical vortex pulses from Gaussian beam pulses (s=+1, l = 0) [2] , or enables us to separate radially- or azimuthally-polarized pulses froms = ±1, l = =±1 optical vortex pulses [3]. This method using a uniaxial crystal is suited for high power pulse generation because the threshold value is higher than those in other methods using a spiral plate [3] , a spatial light modulator (SLM) [4] or a photonic-crystal axially-symmetric polarizer/waveplate [5] . However, earlier studies [2,3] avoid nonlinear effects by inputting a diverging beam into a uniaxial crystal and hence the nonlinear effects, such as Kerr or four-wave-mixing effects between radially- and azimuthally-polarized modes, have not been well investigated. In the present paper, we experimentally investigate optical-vortex pulse propagation in a uniaxial crystal through nonlinear converting between radially- and azimuthally-polarized pulses. © 2013 IEEE.
  • Quasi-real-time measurement of orbital angular momentum spectra of ultra-broadband optical vortices from fork-like interferograms
    Zhili Yang, Keisaku Yamane, Yasunori Toda, Ryuji Morita
    2013 Conference on Lasers and Electro-Optics, CLEO 2013, 01 Jan. 2013
    We experimentally demonstrate a simple and high-precision method for measuring orbital angular momentum (OAM) spectra of femtosecond ultra-broadband optical-vortex pulses from fork-like interferograms. This method enables quasi-real-time OAM measurement for ultrashort or ultra-broadband optical vortices. © 2013 The Optical Society.
  • 非線型屈折率効果を伴う物質の異方性を用いた光子のスピン軌道角運動量変換 III
    鈴木雅人, 山根啓作, 戸田泰則, 戸田泰則, 森田隆二, 森田隆二
    応用物理学会学術講演会講演予稿集(CD-ROM), 27 Aug. 2012, Japanese
  • 高次光渦励起によるGaN励起子の軌道角運動量分解四光波混合分光
    重松恭平, 戸田泰則, 戸田泰則, 山根啓作, 山根啓作, 森田隆二, 森田隆二
    応用物理学会学術講演会講演予稿集(CD-ROM), 27 Aug. 2012, Japanese
  • Measurement of orbital angular momentum spectrum from fork-like interferogram
    ZHILI YANG, YAMANE KEISAKU, TODA YASUNORI, MORITA RYUJI
    応用物理学会学術講演会講演予稿集(CD-ROM), 27 Aug. 2012, English
  • 数サイクル域超短光渦パルス発生
    山根啓作, 戸田泰則, 森田隆二
    応用物理学関係連合講演会講演予稿集(CD-ROM), 29 Feb. 2012, Japanese
  • 非線型屈折率効果を伴う物質の異方性を用いた光子のスピン軌道角運動量変換 II
    鈴木雅人, 山根啓作, 戸田泰則, 戸田泰則, 森田隆二, 森田隆二
    応用物理学会学術講演会講演予稿集(CD-ROM), 16 Aug. 2011, Japanese
  • Complete characterization of single attosecond pulses by the modified spectral phase interferometry with an all-optical apparatus
    J. Zhu, S. Fang, T. Chen, K. Yamane, M. Yamashita
    Optics InfoBase Conference Papers, 01 Dec. 2010
    We present the complete characterization of single attosecond pulses by the modified SPIDER method with a frequency-dependent spectral shear. The validity of this method shows no principle limitation of characterizing arbitrary short single attosecond pulses. © 2010 Optical Society of America.
  • The development of angularly-dispersed non-collinear optical parametric amplifier for generation of high power optical pulses in monocycle regime
    Keisaku Yamane, Takashi Tanigawa, Taro Sekikawa, Mikio Yamashita
    Optics InfoBase Conference Papers, 01 Dec. 2010
    We greatly improved our angularly-dispersed NOPA system and introduced a new stretcher for seed pulses. Consequently, we achieved the broadest gain bandwidth ranging from 500 to 1030 nm with output pulse energy of 45 μJ. © OSA / UP 2010.
  • Ultra-broadband spectral-shifted pulse pair generation by amplitude modulation for single attosecond pulse characterization using the SPIDER method
    J. Zhu, T. Tanigawa, T. Chen, S. Fang, K. Yamane, M. Yamashita
    Optics InfoBase Conference Papers, 01 Dec. 2010
    Ultra-broadband amplitude modulation for spectral-shifted pulse pair generation is realized by a liquid-crystal spatial light modulator. The results indicate that it's a promising way for single attosecond pulse characterization by the conventional SPIDER method. © 2010 Optical Society of America.
  • Complete characterization of single attosecond pulses by the modified spectral phase interferometry with an all-optical apparatus
    J. Zhu, S. Fang, T. Chen, K. Yamane, M. Yamashita
    Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010, 11 Oct. 2010
    We present the complete characterization of single attosecond pulses by the modified SPIDER method with a frequency-dependent spectral shear. The validity of this method shows no principle limitation of characterizing arbitrary short single attosecond pulses. © 2010 Optical Society of America.
  • Ultra-broadband spectral-shifted pulse pair generation by amplitude modulation for single attosecond pulse characterization using the SPIDER method
    J. Zhu, T. Tanigawa, T. Chen, S. Fang, K. Yamane, M. Yamashita
    Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference: 2010 Laser Science to Photonic Applications, CLEO/QELS 2010, 11 Oct. 2010
    Ultra-broadband amplitude modulation for spectral-shifted pulse pair generation is realized by a liquid-crystal spatial light modulator. The results indicate that it's a promising way for single attosecond pulse characterization by the conventional SPIDER method. © 2010 Optical. Society of America.
  • 角度分散型NOPAによる高出力オーバーオクターブ光パルス発生
    山根啓作, 谷川崇, 関川太郎, 山下幹雄
    応用物理学会学術講演会講演予稿集(CD-ROM), 30 Aug. 2010, Japanese
  • 角度分散型NOPAによる高出力極短光パルス発生
    山根啓作, 谷川崇, 関川太郎, 山下幹雄
    応用物理学関係連合講演会講演予稿集(CD-ROM), 03 Mar. 2010, Japanese
  • 2光子吸収下での非同軸光パラメトリック増幅の最適設計
    谷川崇, 山根啓作, 唐澤直樹, 山下幹雄
    応用物理学関係連合講演会講演予稿集(CD-ROM), 03 Mar. 2010, Japanese
  • 高出力モノサイクルパルス発生へ向けた角度分散型NOPA装置開発
    山根啓作, 山根啓作, 谷川崇, 谷川崇, 関川太郎, 関川太郎, 山下幹雄, 山下幹雄
    応用物理学会学術講演会講演予稿集, 08 Sep. 2009, Japanese
  • Ti:sapphireレーザー第3高調波励起による400nm域非同軸光パラメトリック増幅の数値解析
    谷川崇, 谷川崇, 山根啓作, 山根啓作, 唐澤直樹, 関川太郎, 関川太郎, 山下幹雄, 山下幹雄
    応用物理学会学術講演会講演予稿集, 08 Sep. 2009, Japanese
  • マルチオクターブ光スペクトル位相計測のための2DSI装置開発
    片寄慎斗, 山根啓作, 関川太郎, 山下幹雄
    応用物理学関係連合講演会講演予稿集, 30 Mar. 2009, Japanese
  • Monocycle pulse generation and octave bandwidth amplification　　　　　　　　　　　　　　　
    2009 LASERS & ELECTRO-OPTICS & THE PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1 AND 2, 2009
  • Nearly-octave broadband, high-powered optical parametric amplification toward monocycle regime
    Keisaku Yamane, Takashi Tanigawa, Taro Sekikawa, Mikio Yamashita
    2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS, 15 Sep. 2008
    We demonstrated the generation of 34-μJ, 14-fs optical pulses with an ultrabroad bandwidth (540 - 1000 nm) by the use of one angularly-dispersed non-collinear optical parametric amplifier. © 2007 Optical Society of America.
  • Nearly-octave broadband, high-powered optical parametric amplification toward monocycle regime
    Keisaku Yamane, Takashi Tanigawa, Taro Sekikawa, Mikio Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2008
    We demonstrated the generation of 34-μJ, 14-fs optical pulses with an ultrabroad bandwidth (540-1000 nm) by the use of one angularly-dispersed non-collinear optical parametric amplifier. © 2007 Optical Society of America.
  • Efficient compression of carrier-envelope phase-locked laser pulses to 5 fs using an aluminum-coated hollow fiber
    Eisuke Haraguchi, Takashi Tanigawa, Eiichi Matsubara, Keisaku Yamane, Mikio Yamashita, Taro Sekikawa
    Conference on Lasers and Electro-Optics, 2007, CLEO 2007, 01 Dec. 2007
    Carrier-envelope phase-lacked 0.13-TW, 5.2-fs laser pulses were generated by using a 56-cm-long aluminum-coated hollow fiber with an efficiency of 66 %, improved by coating aluminum inside the fiber with a core diameter of 500-μm. © 2007 Optical Society of America.
  • Optical parametric amplification of optical pulses with a nearly one-octave bandwidth from a hollow fiber
    K. Yamane, A. Iwasaki, T. Tanigawa, T. Sekikawa, M. Yamashita
    Conference on Lasers and Electro-Optics, 2007, CLEO 2007, 01 Dec. 2007
    We developed an angularly dispersed noncollinear optical parametric amplifier with a 300-THz bandwidth (550 - 1000 nm) for the first time. To the best of our knowledge, this is the broadest parametric gain. © 2006 Optical Society of America.
  • Optical parametric amplification of optical pulses with a nearly one-octave bandwidth from a hollow fiber
    K. Yamane, A. Iwasaki, T. Tanigawa, T. Sekikawa, M. Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2007
    We developed an angularly dispersed noncollinear optical parametric amplifier with a 300-THz bandwidth (550 - 1000 nm) for the first time. To the best of our knowledge, this is the broadest parametric gain. © 2006 Optical Society of America.
  • Optical parametric amplification of optical pulses with a nearly one-octave bandwidth from a hollow fiber
    K. Yamane, A. Iwasaki, T. Tanigawa, T. Sekikawa, M. Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2007
    We developed an angularly dispersed noncollinear optical parametric amplifier with a 300-THz bandwidth (550 - 1000 nm) for the first time. To the best of our knowledge, this is the broadest parametric gain. © 2006 Optical Society of America.
  • Efficient compression of carrier-envelope phase-locked laser pulses to 5 fs using an aluminum-coated hollow fiber
    Eisuke Haraguchi, Takashi Tanigawa, Eiichi Matsubara, Keisaku Yamane, Mikio Yamashita, Taro Sekikawa
    Optics InfoBase Conference Papers, 01 Jan. 2007
    Carrier-envelope phase-lacked 0.13-TW, 5.2-fs laser pulses were generated by using a 56-cm-long aluminum-coated hollow fiber with an efficiency of 66 %, improved by coating aluminum inside the fiber with a core diameter of 500-μm. ©2007 Optical Society of America.
  • Optical parametric amplification of optical pulses with a nearly one-octave bandwidth from a hollow fiber
    K. Yamane, A. Iwasaki, T. Tanigawa, T. Sekikawa, M. Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2007
    We developed an angularly dispersed noncollinear optical parametric amplifier with a 300-THz bandwidth (550 - 1000 nm) for the first time. To the best of our knowledge, this is the broadest parametric gain. © 2006 Optical Society of America.
  • Carrier-envelop-phase stabilized 3.3-fs optical pulses in the monocycle region
    K. Yamane, T. Naoi, R. Morita, K. Sugiyama, M. Kitano, M. Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2006
    A system generating 3.3-fs optical pulses with a carrier-envelope-phase stabilized, quasi-monocycle waveform (500-nJ pulse energy, 470-to-1060 nm spectral width,1-kHz repetition rate) has been developed for the first time. © 2005 Optical Society of America.
  • Comparison between photonic crystal fiber and tapered fiber for pulse compression - toward mono-cycle optical pulses-
    Muneyuki Adachi, Keisaku Yamane, Ryuji Morita, Mikio Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2006
    A feedback system that combined modified-SPIDER and 4-f active-chirp compensation enabled us to compress photonic-crystal-fiber and tapered-fiber outputs to 5.8 and 8.4 fs, respectively. Advantages and problems of both fibers for further pulse compression were mentioned. © 2005 Optical Society of America.
  • Few-cycle pulse compression using microstructured fibers
    Muneyuki Adachi, Keisaku Yamane, Ryuji Marita, Mikio Yamashita
    Conference on Lasers and Electro-Optics Europe - Technical Digest, 01 Dec. 2005
  • Generation of carrier-envelop-phase stabilized 3.3-fs optical pulses
    K. Yamane, T. Naoi, A. Suguro, R. Morita, M. Yamashita, K. Sugiyama, M. Kitano
    Conference on Lasers and Electro-Optics Europe - Technical Digest, 01 Dec. 2005
  • Nonlinear optical phenomena in gas-filled or microstructured fibers for few- to mono-cycle pulses
    R. Morita, K. Yamane, M. Adachi, M. Yamashita
    IQEC, International Quantum Electronics Conference Proceedings, 01 Dec. 2005
    Nonlinear optical phenomena dominating spectral broadening and spectral phase behavior of pulses propagated in gas-filled or microstructure fibers for compression up to few- to mono-cycle region were discussed from the standpoint of time-frequency characteristics.
  • Comparison between photonic crystal fiber and tapered fiber for pulse compression - Toward mono-cycle optical pulses
    Muneyuki Adachi, Keisaku Yamane, Ryuji Morita, Mikio Yamashita
    Quantum Electronics and Laser Science Conference (QELS), 31 Oct. 2005
    A feedback system that combined modified-SPIDER and 4-f active-chirp compensation enabled us to compress photonic-crystal-fiber and tapered-fiber outputs to 5.8 and 8.4 fs, respectively. Advantages and problems of both fibers for further pulse compression were mentioned. © 2005 Optical Society of America.
  • Carrier-envelop-phase stabilized 3.3-fs optical pulses in the monocycle region
    K. Yamane, T. Naoi, R. Morita, K. Sugiyama, M. Kitano, M. Yamashita
    Quantum Electronics and Laser Science Conference (QELS), 31 Oct. 2005
    A system generating 3.3-fs optical pulses with a carrier-envelope-phase stabilized, quasi-monocycle waveform (500-nJ pulse energy, 470-to-1060 nm spectral width, 1-kHz repetition rate) has been developed for the first time. © 2004 Optical Society of America.
  • Comparison between photonic crystal fiber and tapered fiber for pulse compression - toward mono-cycle optical pulses-
    Muneyuki Adachi, Keisaku Yamane, Ryuji Morita, Mikio Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2005
    A feedback system that combined modified-SPIDER and 4-f active-chirp compensation enabled us to compress photonic-crystal-fiber and tapered-fiber outputs to 5.8 and 8.4 fs, respectively. Advantages and problems of both fibers for further pulse compression were mentioned. © 2005 Optical Society of America.
  • Carrier-envelop-phase stabilized 3.3-fs optical pulses in the monocycle region
    K. Yamane, T. Naoi, R. Morita, K. Sugiyama, M. Kitano, M. Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2005
    A system generating 3.3-fs optical pulses with a carrier-envelope-phase stabilized, quasi-monocycle waveform (500-nJ pulse energy, 470-to-1060 nm spectral width,1-kHz repetition rate) has been developed for the rst time. © 2004 Optical Society of America.
  • Comparison between photonic crystal fiber and tapered fiber for pulse compression - toward mono-cycle optical pulses
    Muneyuki Adachi, Keisaku Yamane, Ryuji Morita, Mikio Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2005
    A feedback system that combined modified-SPIDER and 4-f active-chirp compensation enabled us to compress photonic-crystal-fiber and tapered-fiber outputs to 5.8 and 8.4 fs, respectively. Advantages and problems of both fibers for further pulse compression were mentioned. © 2005 Optical Society of America.
  • Carrier-envelop-phase stabilized 3.3-fs optical pulses in the monocycle region
    K. Yamane, T. Naoi, R. Morita, K. Sugiyama, M. Kitano, M. Yamashita
    Optics InfoBase Conference Papers, 01 Jan. 2005
    A system generating 3.3-fs optical pulses with a carrier-envelope-phase stabilized, quasi-monocycle waveform (500-nJ pulse energy, 470-to-1060 nm spectral width,1-kHz repetition rate) has been developed for the first time. © 2005 Optical Society of America.
  • Microstructured fiber feedback pulse compression to few optical cycles
    Muneyuki Adachi, Muneyuki Adachi, Keisaku Yamane, Ryuji Morita, Mikio Yamashita
    Springer Series in Chemical Physics, 01 Dec. 2004
    A feedback system that combined modified-SPIDER and 4-f active-chirp compensation enabled us to compress photonic-crystal-fiber and tapered-fiber outputs to 6.6 and 8.4 fs, respectively. Compressed-pulse results well agree with fringe-resolved autocorrelation measurement ones.
  • Time-frequency analysis of sub-4 fs optical pulses with over-one-octave bandwidth using Wigner distribution function
    Ryuji Morita, Hayato Takenaka, Keisaku Yamane, Mikio Yamashita
    Conference on Lasers and Electro-Optics Europe - Technical Digest, 01 Dec. 2003
    In this paper, we analyze temporal and spectral properties of sub-4 fs optical pulses with over-one-octave bandwidth using Wigner distribution function (WDF). The analytic results suggested that WDF enables us to intuitively and usefully obtain more information about the deviation from the perfect Fourier transform limited FTL pulse than other representations for monocycle-like pulse generation. © 2003 IEEE.
  • Sub-4 fs optical-pulse generation using a feedback chirp-compensation method
    Keisaku Yamane, Zhigang Zhang, Akira Suguro, Ryuji Morita, Mikio Yamashita
    OSA Trends in Optics and Photonics Series, 01 Jan. 2003
    We compensated for chirp of ultrabroad-band pulses with over-one-octave bandwidth using a feedback method. Consequently, we found the duration of compensated pulses is 4.0 fs. Furthermore, the generation of 3.6-fs pulses with sub-pulses was confirmed. © 2002 Optical Society of America.
  • Characterization of 3.4-fs optical pulses generated in the monocycle region
    Keisaku Yamane, Zhigang Zhang, Akira Suguro, Ryuji Morita, Mikio Yamashita
    OSA Trends in Optics and Photonics Series, 01 Jan. 2003
    We have characterized ultrabroad-band optical pulses with over-one-octave bandwidth (495 - 1090 nm) by use of an improved modifled-SPIDER apparatus and compressed the pulses to 3.4-fs (1.56 cycles) by a feedback phase compensation. © 2003 Optical Society of America.
  • A study on novel spectral behaviors of ultrabroad-band optical pulses generated by induced-phase modulation in a gas-filled hollow fiber using a modified SPIDER technique
    Keisaku Yamane, Naoki Karasawa, Satoru Kusaka, Masakatsu Hirasawa, Akira Suguro, Hidemi Shigekawa, Ryuji Morita, Mikio Yamashita
    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest, 01 Jan. 2002
    Spectral behaviors of ultrabroad-band optical pulses generated by induced-phase modulation in a gas-filled hollow fiber using a modified SPIDER technique were discussed. Pulse-shaper output spectra of the ultrabroad-band optical pulses from 350 to 700 nm was shown. Results showed that the interferometric structure was lost in the spectral region from 310 to 333 nm in ∼1s but was clear in the 333 to 370 nm region.
  • Quantum Zeno effect in optical fibers
    Yamane Keisaku, Ito Masahiro, Kitano Masao
    Technical report of IEICE. LQE, 19 Jan. 2000, Japanese
    The quantum Zeno effect is a seemingly paradoxical phenomenon where a inhibition of transition or a guidance of system is realized without losses in spite of the use of the dissipative processes. It is universal and not restricted to the quantum systems. In this paper as a classical example we report the quautum Zeno effect in a series of off-set spliced optical fibers. We verify the quantum Zeno effect by estimating the transmission coefficient of the fibers. There are two kinds of light propagation modes - wave and ray, and the quantum Zeno effect is found to be peculiar to the former mod...
  • Quantum Zeno effect in optical fibers
    Yamane Keisaku, Ito Masahiro, Kitano Masao
    Technical report of IEICE. PS, 19 Jan. 2000, Japanese
    The quantum Zeno effect is a seemingly paradoxical phenomenon where a inhibition of transition or a guidance of system is realized without losses in spite of the use of the dissipative processes. It is universal and not restricted to the quantum systems. In this paper as a classical example we report the quautum Zeno effect in a series of off-set spliced optical fibers. We verify the quantum Zeno effect by estimating the transmission coefficient of the fibers. There are two kinds of light propagation modes - wave and ray, and the quantum Zeno effect is found to be peculiar to the former mod...
  • Quantum Zeno effect in optical fibers
    Yamane Keisaku, Ito Masahiro, Kitano Masao
    Technical report of IEICE. OPE, 19 Jan. 2000, Japanese
    The quantum Zeno effect is a seemingly paradoxical phenomenon where a inhibition of transition or a guidance of system is realized without losses in spite of the use of the dissipative processes. It is universal and not restricted to the quantum systems. In this paper as a classical example we report the quautum Zeno effect in a series of off-set spliced optical fibers. We verify the quantum Zeno effect by estimating the transmission coefficient of the fibers. There are two kinds of light propagation modes - wave and ray, and the quantum Zeno effect is found to be peculiar to the former mod...
  • Quantum Zeno effect in optical fibers
    YAMANE Keisaku, ITO Masahiro, KITANO Masao
    電気学会研究会資料. : The Papers of Technical Meeting on Electromagnetic Theory, IEE Japan. EMT, 電磁界理論研究会, 19 Jan. 2000, Japanese
  • Control of atomic spin with quantum Zeno effect
    YAMANE K, IKUSHIMA T, KITANO M, OGURA H
    レーザー学会学術講演会年次大会講演予稿集 = Annual meeting, of the Laser Society of Japan digest of technical papers, 01 Jan. 1997, Japanese
  • Control of atomic spin with quantum Zeno effect
    Yamane K, Ikushima T, Kitano M, Ogura H
    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, 13 Sep. 1996, Japanese
  • Laser trapping of rubidium atoms using diode lasers III
    Yamane K, Yoshida A, Tokura T, Kitano M, Ogura H
    Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 16 Mar. 1995, Japanese
  • 29a-E-5 Laser trapping of rubidium atoms using diode lasers II
    Yoshida A, Yamane K, Tokura T, Kitano M, Ogura H
    Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 16 Mar. 1994, Japanese
  • 13a-DA-8 Laser trapping of rubidium atoms using diode lasers
    Yoshida A, Ueno H, Yamane K, Kitano M, Ogura H
    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, 20 Sep. 1993, Japanese

Research Themes

  • Ultrafast rotation of petal-like beam in THz regime using chirped optical-votex pulse train
    Grants-in-Aid for Scientific Research
    01 Apr. 2024 - 31 Mar. 2027
    山根 啓作
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 24K01369
  • Ultimate scheme of optical forces: Manipulation of single molecules on the nanometer scale by utilizing localized electric field, and the operation over macroscopic regions
    Grants-in-Aid for Scientific Research
    30 Jun. 2016 - 31 Mar. 2021
    笹木 敬司, 村越 敬, 森田 隆二, 深港 豪, 山根 啓作
    分子や分子集団に働く光圧の強さや方向をナノメートル空間の各点毎に自在に制御することにより、如何に小さい物質を如何に高い精度で光マニピュレーションできるかという極限性能の追究を目指している。具体的な研究課題としては、１）単一分子レベル光操作：ナノサイズの光局在場により室温・媒質中において分子を個別選択的に捕捉・操作し、配置・配向・配列を制御する技術の開発、２）ナノ空間の光圧デザイン：光電場の振幅・位相・偏光をシングルナノメートルスケールで成形する手法を開発し、分子・分子集合体の形状選別トラッピングやナノ光渦による分子の回転運動（分子渦）・キラル構造形成等の実現、３）光操作システムのマクロ化：基板の大面積化・集積化や多様な光圧制御技術による光ナノ物質操作のマクロ化に挑戦している。今年度は、１）ナノファイバーによるナノ粒子選別輸送と光圧スペクトロスコピーに関する実験実証と、ナノダイヤモンドに作用する共鳴吸収力・散乱力や光圧測定精度の定量的な解析を実施した。また、２）デザインした金属ナノ構造体によるナノ空間角運動量制御により、ダイヤモンドナノ粒子をナノ空間で回転運動を誘起する実験に成功するとともに、超解像イメージング技術を応用展開して、ナノメートルの精度でナノ粒子の運動を可視化する技術を開発した。さらに３）分子ナノ粒子のプラズモニックギャップ捕捉・配置・配列およびキラル分子集合体ナノ粒子の高感度円二色性分光法を開発した。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Hokkaido University, 16H06506
  • Spatio-temporal control of ultrashort optical pulses based on hyper-spectral control of light waves
    Grants-in-Aid for Scientific Research
    01 Apr. 2017 - 31 Mar. 2020
    Yamane Keisaku
    We developed a novel high efficiency converter for spatio-temporal control of ultrashort optical pulses based on a Sagnac-interferometer-type configuration. Thanks to flexibility of a spatial light modulator,
    ultrafast controls of the beam profiles were demonstrated in picosecond regime
    in various directions such as azimuth, radial, linear directions. Furthermore, ultrafast controls of polarization states were also employed by applying our unique technique for spatio-temporal control of ultrashort optical pulses.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 17K05069
  • Development on channeled polarimetry utilizing spectral and spatial carries
    Grants-in-Aid for Scientific Research
    01 Apr. 2015 - 31 Mar. 2018
    OKA KAZUHIKO
    Channeled polarimetry is the method for measuring spectrally- or spatially-resolved polarization-distribution utilizing spectral or spatial carriers. This project aimed to develop new types of channeled polarization measurement and control techniques based on novel and flexible use of spectral and/or spatial carriers. We developed hyperspectroscopic Mueller-matrix polarimeters using both spatial and spectral carriers. In addition, ultrafast rotations of polarization and ring-shaped optical lattice were realized by use of a high-order retarder and a chirped pulse.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), 15H04011