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Matsuda Osamu

Faculty of Engineering　Applied Physics　Quantum Matter PhysicsProfessor

Researcher basic information

■ Degree
  • Dr. Sci., Osaka University, Mar. 1991
■ URL
researchmap URLホームページURL■ Various IDs
J-Global ID■ Research Keywords and Fields
Research Keyword
  • フォトルミネッセンス
  • カルコゲナイド
  • ポンプ・プローブ法
  • ピコ秒レーザー音響法
  • 非破壊検査
  • 電子格子相互作用
  • 表面音響波
  • カンチレバーダイナミクス
  • 原子間力顕微鏡
  • アモルファス
  • 励起子
  • イメージング
  • 走査プローブ顕微鏡
  • 干渉計
  • 異方性
  • 吸着力
  • 剪断音響波
  • 2次元イメージング
  • ヘテロダイン検出法
  • 緩和過程
  • 液体中の音響波
  • UFM
  • 時間分解測定
  • フォースカーブ
  • 励起電子緩和過程
  • 局所弾性率
  • キャリア輸送
  • 差分法解析
  • phonon physics
  • semiconductor physics
  • scanning probe microscopy
  • ultrafast spectroscopy
  • solid state physics
Research Field
  • Nanotechnology/Materials, Applied condensed matter physics
  • Nanotechnology/Materials, Optical engineering and photon science
■ Educational Organization

Career

■ Career
Career
  • Apr. 2022 - Present
    Division of Applied Physics, Faculty of Engineering, Hokkaido University, Professor
  • Apr. 2007 - Mar. 2022
    Division of Applied Physics, Faculty of Engineering, Hokkaido University, Associate Professor
  • May 1998 - Mar. 2007
    Department of Applied Physics, Faculty of Engineering, Hokkaido University, Associate Professor
  • Apr. 1991 - Apr. 1998
    Department of Physics, Faculty of Science, Osaka University, Research Associate

Research activity information

■ Awards
  • Oct. 1994, 日本真空協会, 第19回熊谷記念真空科学論文賞
    GaAs(110)微傾斜面上のAlGaAs分子線成長と量子細線構造の形成
    中島 尚男;木村 憲泰;佐藤 正道;岩根 正晃;井上 恒一;前橋 兼三;長谷川 繁彦;松田 理;邑瀬 和生
■ Papers
■ Other Activities and Achievements
■ Books and other publications
  • Ultrasonics --- Physics and applications
    Osamu Matsuda; Oliver B. Wrigh, Chapter 4 Picosecond laser ultrasonics
    IOP publishing, Oct. 2022, 9780750349345, [Contributor]
  • 音響キーワードブック
    松田 理, レーザー超音波
    コロナ社, 2016, 424-425, Japanese, Scholarly book, [Contributor]
  • Phononic Crystals: Fundamentals and Applications
    Osamu Matsuda; Oliver B. Wright; eds. Abdelkrim Khelif; Ali Adibi, Chap. 7, Optical characterization of phononic crystals in time domain
    Springer, 2015, 191-213, English, Scholarly book, [Contributor]
  • Frontiers in optical methods : nano-characterization and coherent control
    Osamu Matsuda; Oliver B. Wright; eds. Ken-ichi Shudo; Ikufumi Katayama; Shin-ya Ohno, Chap. 7, Generation and Observation of GHz--THz Acoustic Waves in Thin Films and Microstructures Using Optical Methods
    Springer, 2014, 9783642405938, 129-151, English, Scholarly book, [Contributor]
  • Current Topics in Amorphous Materials --Science and Technology--
    Kazuo Murase; Koichi Inoue; Osamu Matsuda, Medium-range structure and relaxation in chalcogenide glasses investigated by Raman scattering
    Elsevier, Amsterdam, 1993, [Joint work]
■ Lectures, oral presentations, etc.
  • 2次元フォノニック結晶の GHz 音響特性の任意周波数イメージング法を用いた解 析
    松田理; 村本裕貴; 古賀裕章; 西田浩紀; 藤田健太郎; 友田基信; ライトオリバー
    第80回応用物理学会秋季学術講演会, 18 Sep. 2019, Japanese, Invited oral presentation
    20 Sep. 2019 - 21 Sep. 2019, [Invited]
  • Two-dimensional Imaging of Zero-Group-Velocity Lamb Waves
    Oliver B. Wright; Qingnan Xie; Sylvain Mezil; Paul H. Otsuka; Motonobu Tomoda; Jerome Laurent; Zhonghua Chen; Osamu Matsuda
    第80回応用物理学会秋季学術講演会, 18 Sep. 2019, English, Invited oral presentation
    18 Sep. 2019 - 21 Sep. 2019, [Invited]
  • Time-resolved imaging of GHz acoustic waves/vibrations in phononic crystals and metamaterials
    Osamu Matsuda
    METANANO 2019, 16 Jul. 2019, English, Invited oral presentation
    15 Jul. 2019 - 19 Jul. 2019, [Invited]
  • Time-resolved imaging of gigahertz surface acoustic waves: recent development and applications
    Osamu Matsuda
    Laser Ultrasonics 2018, 10 Jul. 2018, English, Invited oral presentation
    09 Jul. 2018 - 13 Jul. 2018, [Invited]
  • ime-resolved two-dimensional imaging of gigahertz acoustic waves in phononic crystals and related structures
    Osamu Matsuda
    Photonics West 2018, 01 Feb. 2018, English, Invited oral presentation
    28 Jan. 2018 - 01 Feb. 2018, [Invited]
  • Time-domain Brillouin scattering assisted by diffraction gratings
    O. Matsuda; T. Pezeril; I. Chaban; K. Fujita; V. E. Gusev
    2017 International Congress on Ultrasonics, 19 Dec. 2017, English, Invited oral presentation
    18 Dec. 2017 - 20 Dec. 2017, [Invited]
  • Ultrafast imaging of acoustic wave propagation in microsphere-based metamaterial structures
    P. H. Otsuka; S. Mezil; V. Gusev; O. Matsuda; M. Tomoda; T. Gan; N. Boechler; A. A. Maznev; N. Fang; O. B. Wright
    The 8th International Conference on Metamaterials, Photonic Crystals, and Plasmonics (META '17), 25 Jul. 2017, English, Invited oral presentation
    25 Jul. 2017 - 28 Jul. 2017, [Invited]
  • Optical detection of picosecond acoustic waves generated in grating structures
    Osamu Matsuda; Thomas; Pezeril; Ievgeniia Chaban; Vitalyi Gusev
    19th International Conference on Photoacoustic and Photothermal Phenomena (ICPPP19), 18 Jul. 2017, English, Invited oral presentation
    16 Jul. 2017 - 20 Jul. 2017, [Invited]
  • Time-resolved Imaging of Surface Acoustic Waves Propagating in Two-dimensional Phononic Crystals
    Osamu Matsuda; Hiroki Nishita; Hiroaki Koga; Paul H. Otsuka; Motonobu Tomoda; Oliver B. Wright
    the 4th international conference on phononic crystals/metamaterials, phonon transport/coupling and topological phononics, 09 Jun. 2017, English, Invited oral presentation
    04 Jun. 2017 - 09 Jun. 2017, [Invited]
  • Mapping surface phonons in phononic crystals in real- and k-space
    Paul Otsuka; Ryota Chinbe; Motonobu Tomoda; Osamu Matsuda; Oliver B. Wright; Istvan Veres; Joo-Hyung Lee; Jun-Bo Yoon
    Phononics 2013, 03 Jun. 2013, English, Invited oral presentation
    02 Jun. 2013 - 06 Jun. 2013, [Invited]
  • Time-resolved imaging of the negative refraction of GHz surface acoustic waves in phononic crystals
    O. Matsuda; Hiroaki Koga; Motonobu Tomoda; Ryota Chinbe; Hirotaka Sakuma; Paul; H. Otsuka; Istvan A. Veres; Oliver B. Wright
    Phononics 2013, 03 Jun. 2013, English, Invited oral presentation
    02 Jun. 2013 - 06 Jun. 2013, [Invited]
  • Picosecond laser ultrasonics in GaAs/AlGaAs quantum wells containing spin-polarized excited carriers
    O. Matsuda; C. Li; R. Harley; O. B. Wright; P. Lagoudakis
    International Congress on Ultrasonics -- ICU 2013, 03 May 2013, English, Invited oral presentation
    02 May 2013 - 05 May 2013, [Invited]
  • Time-resolved two-dimensional imaging of GHz surface acoustic waves in phononic crystals and structures based on them
    O. Matsuda
    International School of Quantum Electronics, Second Mediterranean International Workshop on Photoacoustic & Photothermal Phenomena: Focus on Biomedical and Nanoscale Imaging and NDE, 24 Apr. 2012, English, Invited oral presentation
    19 Apr. 2012 - 26 Apr. 2012, [Invited]
  • Picosecond laser ultrasonics in materials physics
    O. Matsuda
    International School of Quantum Electronics, Second Mediterranean International Workshop on Photoacoustic & Photothermal Phenomena: Focus on Biomedical and Nanoscale Imaging and NDE, 20 Apr. 2012, English, Invited oral presentation
    19 Apr. 2012 - 26 Apr. 2012, [Invited]
  • Dynamic imaging of surface acoustic waves in phononic crystals
    Oliver B. Wright; Istvan A. Veres; Dieter M. Profunser; Osamu Matsuda; Brian Culshaw; Udo Lang
    SPIE Smart Nano+Micro Materials and Devices, 07 Dec. 2011, English, Invited oral presentation
    05 Dec. 2011 - 07 Dec. 2011, [Invited]
  • Imaging gigahertz vibrations trapped in phononic crystal cavities
    Oliver Wright; Ryota Chinbe; Paul H. Otsuka; Motonobu Tomoda; Osamu Matsuda; Yukihiro Tanaka
    16th International Conference on Photoacoustic and Photothermal Phenomena, 27 Nov. 2011, English, Invited oral presentation
    [Invited], [International presentation]
  • Dynamic imaging of gigahertz phonons on phononic crystal slabs
    O. B. Wright; R. Chinbe; P. H. Otsuka; M. Tomoda; O. Matsuda; Y. Tanaka; I. A. Veres; S. Kim; H. Jeon
    Phononics 2011, 30 May 2011, English, Invited oral presentation
    29 May 2011 - 02 Jun. 2011, [Invited], [International presentation]
  • Time-resolved two-dimensional imaging of GHz surface acoustic waves in 1D and 2D phononic crystals and devices based on them
    Osamu Matsuda; Istvan A. Veres; Oliver B. Wright
    Photonics West 2011, 22 Jan. 2011, English, Invited oral presentation
    [Invited], [International presentation]
  • Measurement of surface displacement in picosecond laser acoustics free from the photoelastic effec
    O. Matsuda; K. Aoki; T. Tachizaki; O. B. Wright
    International Congress on Ultrasonics -- ICU 2009, 11 Jan. 2009, English, Invited oral presentation
    [Invited], [International presentation]
  • Surface acoustic waves propagating on microstructured phononic crystals
    D. Profunser; O. Wright; O. Matsuda; Y. Tanaka; A. Khelif; V. Laude; S. Benchabane
    Acoustics '08, 29 Jun. 2008, English, Invited oral presentation
    [Invited], [International presentation]
  • Measurement of the velocity dispersion and attenuation in a liquid metal at GHz frequencies
    O. Wright; B. Perrin; O. Matsuda; V. Gusev
    Acoustics '08, 29 Jun. 2008, English, Invited oral presentation
    [Invited], [International presentation]
  • Stroboscopic interferometric full-field imaging of laser-induced surface acoustic waves
    B. Sarens; O. Matsuda; X. Xu; G. Kalogiannakis; R. Salenbien; R. Cote; C. Glorieux
    Acoustics '08, 29 Jun. 2008, English, Invited oral presentation
    [Invited], [International presentation]
  • Optical detection of longitudinal and shear acoustic waves with laser picosecond acoustics
    O. Matsuda; O. B. Wright; D. H. Hurley; V. Gusev; K. Shimizu
    Acoustics '08, 29 Jun. 2008, English, Invited oral presentation
    [Invited], [International presentation]
  • Visualizing high-frequency surface acoustic waves propagating in microstructured phononic metamaterials
    Dieter M. Profunser; Oliver B. Wright; Osamu Matsuda; Udo Lang; Abdelkrim Khelif; Sarah Benchabane; Vincent Laude
    International Congress on Ultrasonics, 09 Apr. 2007, English, Invited oral presentation
    [Invited], [International presentation]
  • Inversion techniques applied to picosecond acoustics
    M. Tomoda; R. Li Voti; O. Matsuda; O. B. Wright
    Thermo International 2006, 30 Jul. 2006, English, Invited oral presentation
    [Invited], [International presentation]
  • Internal friction and dispersion at GHz frequencies in liquid mercury
    O. B. Wright; B. Perrin; O. Matsuda; V. E. Gusev
    The 14th International Conference on Internal Friction and Mechanical Spectroscopy, 05 Sep. 2005, English, Invited oral presentation
    [Invited], [International presentation]
  • Picosecond acoustic phonon pulses generated and detected with ultrashort optical pulses
    Osamu Matsuda
    Japanese Physical Society Meeting, Sep. 2005, Japanese, Invited oral presentation
    [Invited], [Domestic Conference]
  • Generation and detection of picosecond shear acoustic pulses with ultrashort laser pulses in anisotropic materials
    Osamu Matsuda; Oliver Wright; David Hurley; V. E. Gusev; K. Shimizu
    World Congress on Ultrasonics - Ultrasonics International 2005, 29 Aug. 2005, English, Invited oral presentation
    [Invited], [International presentation]
  • Picosecond acoustics in semiconductor quantum wells
    O. Matsuda; T. Tachizaki; T. Fukui; J. J. Baumberg; O. B. Wright
    Photonics West 2005, 22 Jan. 2005, English, Invited oral presentation
    [Invited], [International presentation]
  • Measurement of dispersion relations of point-excited surface acoustic waves
    O. B. Wright; O. Matsuda; Y. Sugawara
    Ultrasonics International 2003, 30 Jun. 2003, English, Invited oral presentation
    [Invited], [International presentation]
  • Picosecond acoustics in quantum wells
    O. Matsuda
    Gordon Research Conference on Photoacoustic & Photothermal Phenomena 2003, 08 Jun. 2003, English, Invited oral presentation
    [Invited], [International presentation]
  • Real time imaging of surface acoustic waves in thin films and microstructures
    O. B. Wright; Y. Sugawara; O. Matsuda; V. E. Gusev
    12th International conference on Photoacoustic and Photothermal Phenomena, 23 Jun. 2002, English, Invited oral presentation
    [Invited], [International presentation]
  • Real time imaging of surface acoustic waves on opaque substrates
    O. B. Wright; Y. Sugawara; O. Matsuda
    Autumn Meeting of the Acoustical Society of Japan, 2002, English, Invited oral presentation
    [Invited], [Domestic Conference]
  • Ripples on crystals
    O. B. Wright; Y. Sugawara; O. Matsuda
    2nd Phonon Engineering Forum, 2002, English, Invited oral presentation
    [Invited], [International presentation]
  • Real time imaging and dispersion of surface phonons
    Oliver B. Wright; Yoshihiro Sugawara; Vitalyi E. Gusev; Osamu Matsuda
    Phonons 2001, 12 Aug. 2001, English, Invited oral presentation
    [Invited], [International presentation]
  • Spatiotemporal mapping of surface acoustic waves in isotropic and anisotropic materials
    Yoshihiro Sugawara; Oliver B. Wright; Osamu Matsuda; Vitalyi E. Gusev
    Ultrasonics International 2001, 02 Jul. 2001, English, Invited oral presentation
    [Invited], [International presentation]
  • Study of new transduction mechanisms for laser picosecond acoustics
    David H. Hurley; Oliver B. Wright; Osamu Matsuda; Vitalyi E. Gusev; Oleg. V. Kolosov; K. Sueoka; K. Mukasa; A. Subagyo
    Ultrasonics International / World Congress on Ultrasound, 29 Jun. 1999, English, Invited oral presentation
    [Invited], [International presentation]
■ Syllabus
  • 先端系物性工学特論, 2024年, 修士課程, 工学院
  • 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
  • 先端系物性工学特論, 2024年, 博士後期課程, 工学院
  • 応用物理学実験法, 2024年, 学士課程, 工学部
  • 現代物理学概論, 2024年, 学士課程, 工学部
  • 応用物理学, 2024年, 学士課程, 工学部
  • 応用物理学, 2024年, 学士課程, 工学部
■ Affiliated academic society
  • THE JAPAN SOCIETY OF APPLIED PHYSICS
  • THE PHYSICAL SOCIETY OF JAPAN
■ Research Themes
  • Development of Ultrasonic Topological Phononics for Multifunctional Elastic Wave Devices
    Grants-in-Aid for Scientific Research
    05 Jul. 2021 - 31 Mar. 2026
    鶴田 健二; 竹澤 晃弘; 松田 理; 畑中 大樹; O・B Wright
    本研究では，計算科学的バンド設計に基づいてトポロジーで保護されたエッジモードの発現を予測，力学系にモデル化・可視化，その知見からエッジモードを介した極めて低損失な音波・弾性波伝搬実現を目指している。初年度は各班で以下の取組・成果が得られた。
    【(岡大+早大)班】 これまでに設計したC3v対称性を持つ水中2次元フォノニック構造を薄膜系に拡張し，kHz～MHz帯でエッジモードが発現するフォノニック構造を設計した。並行して，既知構造をベースに，位相最適化法を用いてより高いロバスト性を持つ最適構造探索に成功，また，それらのプロトタイプ構造を３Dプリンタで試作し，レーザードップラー計測を行った。一方，GHz帯の設計構造は北大班ならびにNTT班で試作・評価を実施中である。
    【北大班】 すでに着手しているフォノニック構造中を伝搬する表面弾性波の時間分解計測による可視化については，強誘電体基板上の銅ピラー構造によるフォノニック結晶で分散関係取得のための予備的な測定を行った。マクロスコピックなメカニカルフォノニック結晶におけるトポロジカルエッジモードの可視化については，回転可能なメカニカルグラフェン構造を設計・製作し，モーションキャプチャーシステムによる同構造の振動測定と解析を進めている。
    【NTT班】(岡大+早大)班がGHz帯で設計したトポロジカルフォノニック導波路構造をMEMS作製技術の援用により試作し，エッジモード励起も確認した。並行して，磁性体装荷のGHzフォノニック結晶素子を作製し，強磁性マグノンによる共振周波数とQ値の変化を確認した。同時に，有限要素法を用いた数値解析法を構築し，計算による当該素子構造における磁気弾性変調効果のシミュレーションを行った。
    また，代表者・分担者・協力研究者による「トポロジカルフォノニクス研究会」を年度内に４回オンライン開催し多数の参加者を得ている。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (S), Okayama University, 21H05020
  • Experiments, theories, and applications of space-time-dependent metamaterials that allow visualization of wave phenomena
    Grants-in-Aid for Scientific Research
    01 Apr. 2022 - 31 Mar. 2025
    友田 基信; 松田 理; O・B Wright
    媒質の物理定数が時間および空間に依存する時間空間媒質を、波動現象が目視可能なアクティブ力学系メタマテリアルで実現することを目標に研究に取り組んだ。２年目には、次のことに取り組んだ。
    1. 有効パラメーターを時空間的に変化できるアクティブ１次元メカニカルメタマテリアルの開発：１次元ウェーブマシンを基に永久磁石を各ロッドに取り付け、電磁石によって各ロッドの有効質量を制御する機構を取り入れるシステムの開発を行った。複数のロッドに対する電磁石のOn/Offのデジタル制御部分の開発を行った。
    2. パッシブな２次元ウェーブマシンによるトポロジカルに保護されたエッジモードの演示：ハニカム格子状の２次元ウェーブマシンを作成し、そのトポロジカルに保護されたバレーホール効果の境界モードを観測する実験とシミュレーションを行った。この研究成果を論文にまとめApplied Physics Express誌に掲載した。
    3. 回転により時間反転対称性を破った２次元ウェーブマシンによるトポロジカルに保護されたエッジモードの演示：系全体を回転し、コリオリ力によって時間反転対称性を破るウェーブマシンを開発し、トポロジカルに保護された１方向に進むエッジモードの実験を行った。この研究成果は2024年春の応用物理学会で発表し、学術論文にまとめている最中である。
    4. 古典力学系におけるフォノニック結晶を離散化した質量バネシステムについて、電子系を参考にトポロジカルな局在状態についての理論構築を行った。１次元のみならず２次元や３次元の系でもバネ定数が一定で質量が変化する質量バネモデルを電子系のモデルに対応付ける方法を考案した。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23K23198
  • Optical generation and detection of GHz-THz acoustic waves in 1- and 2-dimensional nano-scale periodic structures and their application
    Grants-in-Aid for Scientific Research
    01 Apr. 2022 - 31 Mar. 2025
    松田 理; 友田 基信
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 22K04938
  • Experiments, theories, and applications of space-time-dependent metamaterials that allow visualization of wave phenomena
    Grants-in-Aid for Scientific Research
    01 Apr. 2022 - 31 Mar. 2025
    友田 基信; 松田 理
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 22H01930
  • Development and quantitative interpretation of acoustic and phoxonic metamaterial devices from kHz to GHz frequencies
    Grants-in-Aid for Scientific Research
    26 Jun. 2019 - 31 Mar. 2022
    Wright Oliver
    We propose the development and quantitative interpretation of acoustic and phoxonic metamaterial devices from kHz to GHz frequencies, opening new frontiers in metamaterials. We will generate acoustic waves with frequencies ~0.1 kHz-1 GHz and wavelengths from the millimeter scale down to micro- and nano-scales to control bulk, rod, plate and flexural acoustic waves in both fluid and solid metamaterials, as well as developing the new field of phoxonic, i.e. simultaneous photonic and phononic, metamaterials with the aim to create practical devices. We will investigate metamaterial-based acoustic microscopy, metasurfaces for air-water transmission, lightweight single-component metapillars, metaplates or meta-atoms for wideband multimode acoustic isolation or sub-diffraction limit focusing, as well as the creation of phoxonic metamaterials.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (S), Hokkaido University, 19H05619
  • Time-resolved imaging of GHz surface acoustic waves and controlling acoustic chirality
    Grants-in-Aid for Scientific Research
    01 Apr. 2017 - 31 Mar. 2020
    Matsuda Osamu
    In this project, we have established the experimental method to achieve the time-resolved two-dimensional imaging of GHz surface acoustic waves at arbitrary frequencies. The technique overcomes the restriction of the existing techniques, i.e. the insufficient frequency resolution. The technique can be utilized to the development of materials and devices which exploit surface acoustic waves. We have used the developed technique to study the properties of the phononic band gaps of phononic metamaterials, of the zero group velocity modes of Lamb waves on a plate, etc. We also have established the way to control the chirality of the acoustic field. As a related study, we have designed and fabricated a metamaterial rod structure which shows the perfect band gap, i.e. the band gap for all the possible acoustic modes at certain frequency range.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 17H02807
  • GHz laser-ultrasonic computed tomography
    Grants-in-Aid for Scientific Research
    01 Apr. 2016 - 31 Mar. 2019
    Wright Oliver; Otsuka Paul H.; Mezil Sylvain; Devaux Theabaut; Gusev Vitalyi E.; Voti Roberto Li; Juodkazis Saulius; Maznev Alex A.; Dehoux Thomas; Lee Sam H.
    This research concerns GHz ultrasonic computed tomography, which extends the field of non-invasive acoustic internal imaging to the nanoscale. We make use of the optical generation of coherent phonons with frequencies up to ~100 GHz and wavelengths down to ~50 nm in nanostructures to image bulk acoustic waves on very small temporal (~1 ps) and spatial (~50-500 nm) scales. Elastic property imaging, nanoscale acoustic-optic interactions and defect phonon scattering are investigated. This work should lead to new sensing and imaging technologies.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 16H02123
  • Implementation of GHz plate phononic metamtaterials and plasmonic phononic crsytals
    Grants-in-Aid for Scientific Research
    01 Apr. 2016 - 31 Mar. 2019
    Tomoda Motonobu; Otsuka Paul H.; Mezil Sylvain; MINAMIMOTO Hiro; NOMURA Masahiro; Gusev Vitalyi E.; Balogun Olwaseyi
    We controled GHz elastic waves propagating on plates with nanoscale thickness using artificial phononic structures as follows. We designed double negative flexural wave metamaterials and simulated negative refractions. We designed a plasmonic phononic crsytal with perfect phononic bandgap. We imaged surface acoustic waves on a microsphere-based elastic metamaterial structure. We measured reflectivity change on split ring resonators due to mechanical vibrations.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 16H03997
  • Time-resolved imaging of GHz surface acoustic waves using two-dimensional imaging devices
    Grants-in-Aid for Scientific Research
    01 Apr. 2016 - 31 Mar. 2018
    Matsuda Osamu; PEZERIL Thomas; FUJITA Kentaro
    To achieve the fast time-resolved two-dimensional imaging of GHz surface acoustic waves using two dimensional imaging device, we performed the following studies. 1) The interferometer optics which transfers images of surface displacement caused by the acoustic vibration to the imaging plane of the camera as the intensity images has been prototyped, and its functionality has been confirmed. 2) Self-adopted interferometer setup using photo-refractive crystal has been considered. 3) The software for the fast transfer and analysis of images for high-speed CCD camera has been developed. As the secondary studies, 4) the light scattering theory for the quantitative handling of the modulation of the light reflection by the acoustic waves has been developed, and 5) the optical generation of detection of acoustic waves using nano-scale metal grating structure has been studied.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 16K13713
  • Construction and application of GHz acoustic metamaterials
    Grants-in-Aid for Scientific Research
    21 Oct. 2013 - 31 Mar. 2016
    Wright Oliver; MATSUDA Osamu; TOMODA Motonobu; Otsuka Paul; Mezil Sylvain; Gusev Vitali; Lee Sam Hyeon; Kuipers L. Kobus
    We investigate gigahertz acoustic metamaterials, extending them to the nanoscale and thus facilitating the development of new nanoscale acoustic microscopies. The aim is to optically generate coherent phonons with frequencies ~1-100 GHz and wavelengths down to ~100 nm in nano-metamaterials to control bulk and surface acoustic waves on very short temporal (~1 ps) and spatial (~20-50 nm) scales. Applications include solid-state super-lensing, extraordinary transmission, negative refraction, surface acoustic wave cloaking, metamaterial resonators and hybrid opto-mechanical materials. We concentrate on three main topics: 1. Design of GHz acoustic metamaterials, 2. GHz extraordinary transmission, metamaterial resonators, and deep-sub-wavelength focusing, 3. Hybrid GHz opto-mechanical metamaterials. During the course of this work a number of supplementary applications were conceived at lower frequencies.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, 25246030
  • Development of laser picosecond ultrasonic microscopy with micro ultrasonic lens
    Grants-in-Aid for Scientific Research
    01 Apr. 2013 - 31 Mar. 2016
    Tomoda Motonobu; WRIGHT Oliver B.; MATSUDA Osamu; Otsuka Paul; Mezil Sylvain; Juodkazis Saulius; Ulbricht Ronald; Gusev Vitali
    We developed ultrasonic microscopy techniques with high frequencies and high resolutions, aiming to measure and image surface topographies and three-dimensional internal structures of samples. This technique is based on laser picosecond ultrasonics which generate and detect ultrasonic pulses at 10-100 GHz.
    We did ultrasonic focusing with micro-structures like a micro-ultrasonic-lens and a micro-fiber, making a smaller probe light spot by use of a high numerical aperture oil-immersion objective lens, high resolution depth-profile ultrasonic measurements in transparent samples, development of arbitrary frequency measurements which are not restricted to repetition pulse laser frequencies, and controlling of pump beam spot shapes.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 25390114
  • Ultrafast phononic plasmonics
    Grants-in-Aid for Scientific Research
    2010 - 2012
    OLIVER B. Wright; MATSUDA Osamu; TOMODA Motonobu; OTSUKA Paul; JEREMY Baumberg; L. KOBUS Kuipers
    By means of an ultrafast optical technique, we investigate the coupling of high frequency phonons at GHz frequencies with metallic plasmonic structures. Various samples are probed, including nanovoid arrays, lattices of tiny holes exhibiting extraordinary optical transmission (EOT) and nanoscale linear waveguides. For the nanovoid arrays, we reveal GHz breathing vibrations of the voids by 2D imaging, showing how the vibrations couple to localized Mie plasmons. For the EOT samples, we reveal collective vibration of the hole arrays, and their effect on the optical transmission modulation. For the waveguides we describe work in progress, and fabrication of nanoscale linear gold waveguides.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Coinvestigator not use grants, Competitive research funding, 22246012
  • Controlling electronic and optical properties in semiconductor quantum structures using surface acoustic waves
    Grants-in-Aid for Scientific Research
    2008 - 2011
    MATSUDA Osamu; WRIGHT Oliver; TOMODA Motonobu
    We aimed to transfer the excitons and to control their life time in semiconductor samples using the surface acoustic waves generated by the ultrashort light pulse absorption. For this purpose, we developed an experimental technique which allows the time resolved two-dimensional imaging of the GHz surface acoustic wave propagation and the two-dimensional imaging of the photoluminescence at the same region of the sample at low temperature (10K). Connecting to this, we also developed a heterodyne technique which use the modulated light for both excitation and probing light. We also developed an analyzing method for the strain components using the polarization of the probing light.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, Competitive research funding, 20360038
  • Visualization and Mode-Control of Phonons Confined in Microstructures
    Grants-in-Aid for Scientific Research
    2007 - 2009
    O・B Wright
    This work involves the imaging and control of phonon modes confined in a wide variety of novel microscopic geometries with unprecedented picosecond temporal, micron spatial, and megahertz frequency resolutions. The following topics are investigated : visualizing Bloch waves and modes in phononic crystals, phononic crystal waveguides and cavities, investigating whispering gallery modes, acoustic negative refraction, and phase singularities in surface acoustic wave fields, and applications to industrially-produced surface acoustic wave resonators. Visualization and Mode-Control of Phonons Confined in Microstructures
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Coinvestigator not use grants, Competitive research funding, 19206013
  • Generation and detection of picosecond shear acoustic pulses by ultra short light pulses and their application to materials physic
    Grants-in-Aid for Scientific Research
    2005 - 2007
    MATSUDA Osamu; WRIGHT B. Oliver; TOMODA Motonobu
    Picosecond acoustic pulses can be used to study the internal structure of medium in nanometer spatial region, or the electron and lattice dynamics of medium in picosecond temporal region. Especially a method named picosecond laser ultrasonics, which uses ultra short light pulses for the generation and detection of the acoustic pulses, has been exploited to evaluate the thickness profile and elastic properties of multilayers, or to study the ultrafast dynamics of photo-induced carriers. In the previous studies, mostly the longitudinal acoustic waves have been used because of the symmetry of the system. However, the additional usage of shear acoustic waves would be favorable to extend the applicability of the method. This research aims to develop the picosecond laser ultrasonics using shear acoustic waves and to apply the method to various studies in materials physics.
    The main achievements are as follows. 1) With the low symmetry surface of the anisotropic medium such as Zn and GaAs single crystals, the laser picosecond ultrasonics measurement is carried out. We develop a general light scattering theory for the inhomogeneously modulated multilayers of anisotropic medium. With this theory, the experimental results were quantitatively analyzed to retrieve the photoelastic tensor components, ultrasonic absorption coefficients, electron-phonon interaction coefficients, etc.. 2) We develop a method for the picosecond laser ultrasonics measurement in liquids. The acoustic pulses are generated at the GaAs single crystal and their propagation in water and glycerol is studied. 3) We develop a method to measure the surface displacement caused by the acoustic waves independent of the photoelastic signal. 4) We develop a theory for the acoustic wave propagation in inhomogeneous medium. 5) We develop a method to map the elastic properties of polycrystalline medium with the anisotropic acoustic wave propagation. The method is utilized to study the Cu polycrystals and the artificial phononic crystals.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, Principal investigator, Competitive research funding, 17360024
  • フォトニック結晶ファイバーによる超高速音響光学変調器の開発
    科学研究費助成事業
    2004 - 2005
    WRIGHT O・B; 松田 理; 友田 基信; 田村 信一朗
    我々は、ローマ大学「ラ・サピエンザ」のR.Li Voti博士から提供された高精度のTiO_2/Ag多層膜試料を用い、試料中を伝播するピコ秒超音波の広範囲にわたる波長依存性・時間分解の測定を行った。同期した2つの波長可変な超短パルスレーザーシステムを使い、反射率変化の応答を観測した。この試料はフォトニックバンドギャップを波長400nm以下と800nm以上の光に対してもつので、ポンプ光の波長を800nmに固定してプローブ光の波長を400nm付近のバンドギャップエッジの周りで変化させ測定を行った。
    プローブ光の波長を400nmから長波長側へ走査し、プローブ光の波長により試料の反射率変化が増大することを発見した。これは、1次元フォトニック構造においてフォトニックバンドギャップが超高速音響光学作用を増大することに利用できることを結論付けるものである。
    我々はまた、プローブ光が試料中で多重反射する効果も含めた転送行列法によって、試料中を伝播するピコ秒超音波による反射率変化についての数値的なシミュレーションを行った。この理論結果は、すべてのプローブ光の波長領域において実験結果と一致し、これは初めてフォトニック構造におけるピコ秒時間領域での音響光学変調を定量的に評価したことになる。
    この研究は、さらに2次元や3次元フォトニック結晶におけるピコ秒音響光学作用に研究を拡張する基礎となるものである。
    日本学術振興会, 萌芽研究, 北海道大学, Coinvestigator not use grants, Competitive research funding, 16656020
  • Spatial visualization of electron wavefunctions and acoustic phonon transduction in semiconductor quantum wells and related applications
    Grants-in-Aid for Scientific Research
    2001 - 2005
    WRIGHT Oliver B.; MATSUDA Osamu; TOMODA Motonobu
    1)THz phonon generation and detection experiments were done on 2-well and 3-well GaAs/GaAlAs samples with surface-absorbed probe optical pulses and wavelength-tuned pump optical pulses. These first spectroscopic experiments in the domain of picosecond acoustics (up to 0.3 THz) were successfully treated with theoretical models to describe the phonon generation and detection in these multilayers. We also characterized the spectral generation efficiency.
    2)Improvements in temporal and spatial resolution were achieved using shorter (〜400 fs) optical pulses to demonstrate detection at frequencies up to 0.5 THz. We also developed a new optical-polarization-sensitive oblique-incidence technique, tested on Cr, to separate different signal contributions, and modelled the phonon pulse shapes for this sample.
    3)A Novel ultrafast Sagnac interferometer was developed for picosecond phonon detection with 1 μm spatial resolution, applicable to semiconductors, involving a single focusing objective.
    4)Bulk GaAs picosecond acoustics was implemented to help interpret the quantum well results, we investigated ultrafast phonon generation in 3 different GaAs samples. We demonstrate the generation of picosecond shear pulses using anisotropic cuts and pulse-broadening by electron diffusion.
    5)A novel detection scheme based photoluminescence was extensively tested on quantum well samples. The results show that we require a higher detection sensitivity to achieve detection of phonon -pulses detection within a quantum well rather than at the surface.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (S), HOKKAIDO UNIVERSITY, Coinvestigator not use grants, Competitive research funding, 13852006
  • Two-dimensional real time imaging of the propagation of surface waves on materials in picosecond temporal regime
    Grants-in-Aid for Scientific Research
    2002 - 2003
    MATSUDA Osamu; TOMODA Motonobu; TAMURA Shin-ichiro; WRIGHT B. Oliver
    Imaging of the surface acoustic phonon focusing phenomena reveals complicated patterns of the acoustic energy propagation in anisotropic materials. The imaging technique is expected to play an important role in the development of surface acoustic wave devices in GHz frequency region. In this study, we develop a real-time two-dimensional imaging technique for the surface acoustic wave propagation. It is based on the ultrafast optical pump-probe method and the extremely stable common-path optical interferometer. In case of the diamond substrate covered with Au film, it is shown that the surface acoustic phonon up to 2 GHz is generated and detected by this method. We also develop the analysis method to obtain the multiple mode of the surface acoustic phonon directly from the experimental results on transparent and opaque, isotropic and anisotropic samples.
    As a new imaging technique especially for opaque samples, a method using automated mirror is developed. As for the detection of the surface acoustic wave, instead of the interferometer, the method based on the reflectivity change is developed. In relation to this, we develop the light scattering theory that is applicable to the normal and non-normal probe light incidence to the anistropic multilayer sample with inhomogeneous optical properties.
    As an application of the technique, the surface acoustic wave is imaged in the poly-crystalline Cu sample consists of micron size grains. The diffraction and reflection at the grain boundary is clearly observed. The result is compared with the simulation based on the FDTD method. It provides the opportunity to evaluate the subsurface structure around the grain boundaries.
    In summary, we have developed the general purpose surface acoustic wave measurement and analysis method with pico-second time resolution and micron scale spatial resolutions. By this method, we have clarified the physics of surface acoustic wave propagation in MHz-GHz frequency region.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Principal investigator, Competitive research funding, 14205014
  • Nanometer scale real-time mapping of vibrations in pico second tempral region
    Grants-in-Aid for Scientific Research
    2000 - 2001
    MATSUDA Osamu; INAGAKI Katsuhiko; MUTO Shunichi; WRIGHT B. Oliver
    In this research, we aim to develop a new microscope which has both nanometer spatial resolution and picosecond temporal resolution. It can be realized by the combination of the scanning probe microscope and the time-resolved measurement technique with ultrashort laser pulses. The former has the nanometer spatial resolution and the latter the picosecond temporal resolution. The combination of the ultra high speed optical switch with ultra short laser pulses and the scanning tunneling microscope has been already proposed along this way. It is proved, however, that the stray capacity between the sample and the microscope tip substantially reduces the spatial resolution when the tunnel current is switched very fast. As a way getting around the above problem, we propose a scanning probe microscope that detects ultrashort phonon pulses excited by ultrashort laser pulses.
    The ultrashort light pulses from a mode-locked Ti-sapphire laser are divided into two optical paths. An optical delay line is used to introduce a time difference of ± 1 ns between the pulses in two paths. The pulses passing each line are modulated with different frequencies. A metal thin film sample is irradiated by the modulated light pulses to generate the ultrashort acoustic phonon pulses. The generated periodic surface displacement is detected by the atomic force microscopy. We considered this method theoretically and did actual experiments. In addition, we did related studies of the technique to estimate the local elasticity with nanometer spatial resolution by the ultrasonic force microscope and of the ultra high frequency phonon generation by a semiconductor quantum well structure.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Principal investigator, Competitive research funding, 12305007
  • 光ヘテロダイン原子間力顕微鏡による固体熱物性のナノスケールイメージングの研究
    科学研究費助成事業
    2000 - 2001
    WRIGHT Oliver B.; 松田 理
    本研究は、固体熱物性の空間的分布をナノスケールで画像化できる光学ヘテロダイン原子間力顕微鏡を開発することを目的とした。試料表面においてレーザー照射により光熱的に励起された超音波振動(周波数100MHz以下)の振幅および位相を、ナノメートルの横空間分解能で2次元画像化する。これにより試料表面および表面下の熱的な性質についてのナノメートル空間分解能測定を可能にする。
    以下に示すようにして光ヘテロダイン原子間力顕微鏡を構築した。SiN透明カンチレバーを持つ原子間力顕微鏡のカンチレバー支持部に圧電素子をとりつけ、カンチレバーを周波数ω_1=11MHzにて振動させる。探針による試料表面の観察部位にω_1近傍の周波数ω_2で変調された赤外光を照射し試料表面に周期的な熱振動を励起する。試料表面は試料の局所的熱物性を反映してω_2による膨張収縮を繰り返す。試料探針間相互作用の試料探針間距離に対する非線形性により、カンチレバーの平均変位はω_1-ω_2の振動数で変化する。この変化の振幅と位相を原子間力顕微鏡の光てこ検出部を用いて検出し画像化する。試料としてSi基板上にCr薄膜(膜厚100nm)およびSiO_2/Cr薄膜(膜厚150nm/100nm)を作製したものを用いた。これらは同一基板上にμmスケールのモザイク状に形成されている。試料表面層は同一膜厚のCr層で覆われているので、表面から100nm深さまでの機械的な性質は試料表面の場所によらないようになっている。この試料についての光ヘテロダイン顕微鏡による観測を行った。試料表面下のSiO_2層の有無による熱物性の違いを反映して、位相像に大きなコントラストが得られた。1次元熱拡散モデルに基づいてこのコントラストを半定量的に解析した。これらの結果により光ヘテロダイン顕微鏡が試料表面下の局所的熱物性を画像化する有力な手段であることが示された。
    日本学術振興会, 萌芽的研究, 北海道大学, Coinvestigator not use grants, Competitive research funding, 12875007
  • Evaluation of local elasticity and inelasticity with nonoscale spatial resolution with scanning ultrasonic force microscope
    Grants-in-Aid for Scientific Research
    1999 - 2000
    MATSUDA Osamu; INAGAKI Katsuhiko; MUTO Shunichi; WRIGHT Oliver,b; YAMAMOTO Noritaka
    In this research, we develop the scanning ultrasonic probe microscope with lateral resolution < 1 nm and study the physics involved in it. The contributions of elasticity, viscosity, surface energy at the sample-tip interface to the sample and cantilever dynamics are analyzed distinctively in order to carry out the quantitative measurement on the surface and subsurface local complex elasticity.
    A commercial AFM is modified by attaching the PZT transducer at the cantilever base or on the scanner to make the scanning ultrasonic probe microscopy which is capable to apply the ultrasonic vibration to the cantilever or the sample. At various frequency below and above the cantilever resonance frequency and at various ultrasonic amplitude, we carry out the force curve measurement on Si and GaAs single crystals. The vibration amplitude is calibrated with Michelson enterferomenter. The obtained force curve has the following common features : 1)In case of no applied vibration, small "jump-in" in the approach phase and large "jump-out" in the retraction phase are observed. 2)Within creasing the vibration amplitude, the "jump-out" position rapidly approaches to the "jump-in" position. 3)At above certain vibration amplitude, a new "repulsive jump' is observed for both approach and retraction phase.
    These results are analyzed by considering the cantilever motion numerically with the finite difference method. In the analysis, we give the elasticity of the tip and sample, damping, adhesion, and assume the JKR model for the tip-sample interaction. The result explains the features 1)and 2)quantitively and proves the validity of the analysis.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B)., Hokkaido University, Principal investigator, Competitive research funding, 11555018
  • Nanoscale Probing of Ultrafast Coherent Phonon Generation and Electron Diffusion in Metals
    Grants-in-Aid for Scientific Research
    1999 - 2000
    WRIGHT Oliver b.; MATSUDA Osamu; TAMURA Shinichiro
    In main aim of this study is to extend our knowledge of ultrafast acoustic phonon generation using femtosecond light pulses to basic metallic materials and nanostructures. The phonon pulse propagation dynamics in such materials and the phonon generation mechanisms can be studied. The use here of a tightly focused excitation and probe light beams a few microns in diameter allow the detection of phonons with -10 μm spatial resolution. In order to do this we have made use of an ultrafast reflectometry and interferometry for measurements at normal incidence.
    We have carried out the first generation and detection of coherent phonons in amorphous and liquid metals. The results for Hg demonstrate that electron diffusion is very likely to be influencing the phonon generation. An interesting asymmetric pulse shape was observed. The first demonstration that picosecond phonon pulses could be generated and detected in an amorphous metal was also successful.
    Coherent phonon generation and detection experiments in transition metals with -100 fs optical pulses, in particular for Cr and for Ni, shows that we can successfully model the phonon pulse shapes with the two-temperature model, taking due account of ultrasonic attenuation measured in experiment.
    Ultrashort optical pulse experiments in transition metals with -10 fs optical pulses have been attempted for the first time. Using a -20 fs order optical pulse width in the infrared for both the pump and probe beams, the effect of ultrafast electron diffusion on ultrashort timescales is clearly evident in the data for a series of films of different thicknesses. A striking reversal in polarity of the signals for thicker films was observed.
    Preliminary results for the generation of coherent phonon pulses in multilayer metal structures show that electron diffusion must be taken into account in order to explain the observed acoustic echoes.
    Related theoretical work was successful in elucidating the way light is modulated by strain on reflection or transmission through a multilayer structure. This can be done not only for longitudinal coherent phonons but also for shear coherent phonons.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A)., HOKKAIDO UNIVERSITY, Coinvestigator not use grants, Competitive research funding, 11305008
  • INVESTIGATION OF RIGIDITY PERCOLATION, MEDIUM-RANGE STRUCTURES AND FRACTON IN MULTI-COMPOUND GLASSY SEMICONDUCTORS
    Grants-in-Aid for Scientific Research
    1997 - 2000
    MURASE Kazuo; MATSUDA Osamu; INOUE Koichi; WANG Yong
    We have presented a comprehensive study of the roles of nanoscopic structural units in chalcogenide glasses in relaxation behaviors around glass transition temperature, structural changes toward crystallization, electronic structures around band-tails, and relaxation processes of photoexcited carriers.
    First, we have shown that the variation of Se_n (n>2) chain segments essentially determines relaxational behaviors of networks. We have also shown that the compositional dependence of resonant Raman spectra is explained by the variation in lengths of the Se_n chain and the CST chain. Second, we have found that intrinsic inhomogeneity in Ge-Ge ethan-like units, Se-Se bonds, and fragments similar to β-GeSe_2 can cause significantly different macroscopic structural changes in GeSe_2 glass. Finally, we have demonstrated that threefold-coordinated Se atoms forming Se-Se bonds play a key role in the photoinduced structural change and the dynamics of photoexcited carriers in GeSe_2 glass.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B)., OSAKA UNIVERSITY, Coinvestigator not use grants, Competitive research funding, 09440117
  • アモルファスカルコゲナイド半導体における異方性光誘起構造変化現象の研究
    科学研究費助成事業
    1998 - 1999
    松田 理
    物質の準安定状態であるガラス状態は、通常、熱的な励起により、安定な結晶状態に移行する。アモルファスカルコゲナイド半導体ではこの転移を光照射によって起こすことができる。光には偏光方向の自由度があるので、このような構造変化にかかわる特徴的な方向(例えば結晶軸)を励起光の偏向方向によって制御できる可能性がある。本研究では、光誘起構造変化現象における光励起状態の緩和過程の果たす役割について調べる。
    アモルファスカルコゲナイド半導体における、光励起直後の電子励起状態の緩和過程を調べることを目指して。フェムト秒光パルスを用いたポンププローブ超高速過渡的反射率変化測定装置を組み立てた。この測定装置に用いる新しい共通パス型の干渉計を開発した。本装置により試料のピコ秒時間領域の反射率変化および表面変位を検出することができる。
    装置の評価のためにアモルファスSi薄膜についての測定を行った。結果を定量的に理解するために、薄膜試料内での熱伝搬、超音波伝搬、電子格子相互作用を考慮したモデルの構築を行った。また、等方的なアモルファス物質中に光によって誘起される非等方的な誘電率変化を検出するための実験配置について詳しい検討を行った。
    日本学術振興会, 奨励研究(A), 北海道大学, Principal investigator, Competitive research funding, 10740149
  • Ultra high frequency phonon pulse generation and detection in solids and liquids
    1998
    Competitive research funding
  • Exciton relaxation in chalcogenide semiconductor investigated by time-resolved photoluminescence measurement
    Grants-in-Aid for Scientific Research
    1995 - 1996
    MATSUDA Osamu; INOUE Koichi
    Amorphous chalcogenide semiconductors which contain the elements of group VI show various kinds of photo-induced structural changes such as photo-darkening, photo-bleaching, photo-crystallization, etc.. These changes are caused by lattice deformations which result from the relaxation of the photo-excited electrons through the strong electron-phonon interaction. It is also important that the amorphous states are not in the thermal equilibrium. The chalcogen atoms which are in two-fold coordinated are considered to play an important role, but the details of the mechanism is still not clear. For example, it is still unknown how the excited electron distorts the lattice.
    To know the relaxation process of the excited electron in the amorphous and crystalline GeSe_2 which is a typical chalcogenide semiconductor, the time resolved photo-luminescence measurement was carried out. Both phases have the band-gap in visible region (2.2-2.7eV). The excitation by band-gap light causes a broad Gaussian-shaped photo-luminescence in near-infra-red region (-1eV). The large Stokes-shift is due to the strong electron-phonon interaction. The continuous wave laser light is modulated by an acousto-optic modulator and then used for the excitation source of the time-resolved measurement. The measured time region was 100ns-3ms after the cut-off of the excitation light. There are many similarities in the spectral shape between the amorphous and crystalline GeSe_2. This result shows that the initial states of the luminescence are similar in both materials. As for the time-profile, the crystalline GeSe_2 shows the single exponential decay, while the amorphous GeSe_2 shows the extended exponential decay. The later is caused by the energy distribution of the luminescent centers by structural fluctuation in the glass.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Osaka University, Principal investigator, Competitive research funding, 07640445
  • カルコゲナイド半導体の励起緩和過程の研究
    科学研究費助成事業
    1992 - 1992
    松田 理
    日本学術振興会, 奨励研究(A), 大阪大学, 04740168
■ Industrial Property Rights
  • 試料の物理的性質の測定方法
    Patent right, 松田 理
    特願2013-93863, 26 Apr. 2013
  • 試料の物理的性質の測定方法
    Patent right, オリバ ライト; デビッド ハーリー; 松田 理
    特願2000-038980, 17 Feb. 2000
    特開2001-338232, 24 Aug. 2001
    特許3288670
    12 Apr. 2006
  • 試料の物理的性質の測定方法
    Patent right, 松田 理; オリバ ライト; 菅原 美博; ヴィタリィ グセフ, 独立行政法人科学技術振興機構
    特願2002-032916, 08 Feb. 2002
    特開2003-232778, 22 Aug. 2003
    特許第3766032号
    03 Feb. 2006
    200903007748260765
  • 試料の物理的な特性を測定するための装置
    Patent right
    特願2005-117623, 15 Apr. 2005
    特開2005-338063, 08 Dec. 2005
    200903047610339141
  • 試料の物理的性質の測定装置
    Patent right, オリバ ライト; デビット ハーリー; 松田 理, 科学技術振興事業団
    特願2000-038982, 17 Feb. 2000
    特開2001-228123, 24 Aug. 2001
    特許第3288672号
    15 Mar. 2002
    200903068939460208
  • 試料の物理的性質の測定装置
    Patent right, オリバ ライト; デビッド ハーリー; 松田 理, 科学技術振興事業団
    特願2000-038981, 17 Feb. 2000
    特開2001-228122, 24 Aug. 2001
    特許第3288671号
    15 Mar. 2002
    200903090253167550
  • Two-arm Sagnac interferometer with two beam splitters
    Patent right
    6552799
  • Two-arm Sagnac interferometer with three beam splitters
    Patent right
    6549285
  • Single-arm Sagnac interferometer with two beam splitters
    Patent right
    6552800
  • Instrument for measuring physical property of sample
    Patent right
    EP1171643A1

Research Profiles

■ Research Profiles