Active control of photoinduced phase transition

• Project/Area Number: 20340074
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: ONDA Ken Tokyo Institute of Technology, 大学院・総合理工学研究科, 特任准教授 (60272712)
• Project Period (FY): 2008 – 2010
• Project Status: Completed (Fiscal Year 2010)
• Budget Amount: ¥19,240,000 (Direct Cost: ¥14,800,000、Indirect Cost: ¥4,440,000); Fiscal Year 2010: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2009: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2008: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
• Keywords: 光物性 / 有機導体 / 強相関電子系 / 超高速分光 / 光誘起相転移 / 超高速過程 / 有機伝導体 / 強相関系

Research Abstract

The aim of this study is to control actively photoinduced phase transition in strongly correlated molecular crystals, whose applications to ultrafast optical switching devices are expected. For this purpose, I developed various types of time-resolved spectroscopic system over a range from 10 fs to 100 ps, and found the quasi-stable state only created by photo-excitation and the time delay from electronic phase transition to lattice phase transition. In addition, I succeeded in finding the phenomena that photoinduced phase transition can be controlled actively through variation of excitation photon-density, coherent phonon, and electronic coherence.

Research Products

• [Journal Article] Acceleration of domain wall movement by photo irradiation in perovskite-type cobaltite (2011)
  • Author(s): Y.Okimoto, M.Kurashima, K.Seko, T.Ishikawa, K.Onda, S.Koshihara, T.Kyomen, M.Itch
  • Journal Title: Phys.Rev.B 83
  • Peer Reviewed
• [Journal Article] Photoinduced Dynamics of a Quasi-1D Organic Conductor over a Range from 10 fs to 100 ps (2011)
  • Author(s): Ken Onda, She Ogihara, Jiro Itatani, Tadahiko Ishikawa, Yoichi Okimoto, Shinya Koshihara, Xiangfeng Shao, Yoshiaki Nakano, Ilideki Yamochi, Gunzi Saito
  • Journal Title: Ultrafast Phenomena XVII, Oxford University Press, New York Pages: 188-190
  • Peer Reviewed
• [Journal Article] Light-driven modulation of fluorescence color from azobenzene derivatives containing electron-donating and electron-withdrawing groups (2010)
  • Author(s): Mina clan, Yasuo Norikane, Ken Onda, Yoko Matsubawa, Masaru Yoshida, Masahiko HaraNew
  • Journal Title: J.Chem. 34 Pages: 2892-2896
  • Peer Reviewed
• [Journal Article] Ultrafast and large reflectivity change by ultraviolet excitation of the metallic phase in the organic conductor(EDO-TTF)_2PF_6 (2010)
  • Author(s): K.Onda, M.Shimizu, F.Sakaguchi, S.Ogihara, T.Ishikawa, Y.Okimoto, S.Koshihara, X.F.Shao, Y.Nakano, H.Yamochi, G.Saito
  • Journal Title: Physica B 405
  • Peer Reviewed
• [Journal Article] Photoinduced Dynamics of a Quasi-1D Organic Conductor over a Range from 10 fs to 100 ps (2010)
  • Author(s): K.Onda, 他
  • Journal Title: Ultrafast Phenomena XVII Pages: 188-190
  • Peer Reviewed
• [Journal Article] Light-driven modulation of fluorescence color from azobenzene derivative s containing electron-donating and electron-withdrawing groups (2010)
  • Author(s): M.Han, 他
  • Journal Title: New J.Chem. Volume: 34 Pages: 2892-2896
  • Peer Reviewed
• [Journal Article] Ultrafast and large reflectivity change by ultraviolet excitation of the metallic phase in the organic conductor (EDO-TTF)_2PF_6 (2010)
  • Author(s): K.Onda, 他
  • Journal Title: Physica B Volume: 405
  • Peer Reviewed
• [Journal Article] Large and ultrafast photoinduced reflectivity change in the charge separated phase of Et_2Me_2Sb[Pd(dmit)_2]_2 (2009)
  • Author(s): T.Ishikawa, N.Fukazawa, Y.Matsubara, R.Nakajima, K.Onda, Y.Okimoto, S.Koshihara, M.Lorenc, E.Collet, M.Tamura, R.Kato
  • Journal Title: Phys.Rev.B 80
  • Peer Reviewed
• [Journal Article] Ultrasonic propagation of a metallic domains in Pr_<0.5>Ca_<0.5>Co_<0.3> undergoing a photoinduced insulator-metal transition (2009)
  • Author(s): Y.Okimoto, X.Peng, M.E.Tamura, T.Morita, K.Onda, T.Ishikawa, S.Koshihara, N.Todoroki, T.Kyomen, M.Itch
  • Journal Title: Phys.Rev.Lett. 103
  • Peer Reviewed
• [Journal Article] Anomalous photo-induced response by double-pulse excitation in the organic conductor (EDO-TTF)_2PF_6 (2009)
  • Author(s): K.Onda, S.Ogihara, T.Ishikawa, Y.Okimoto, X.F.Shoo, Y.Nakano, H.Yamochi, G.Saito, S.Koshihara
  • Journal Title: J.Phys.Conf.Ser. 148 Pages: 12002-12002
  • Peer Reviewed
• [Journal Article] Excitation photon energy dependence of photo-induced phase transition in (EDO-TTF)_2PF_6 (2009)
  • Author(s): S.Ogihara, K.Onda, M.Shimizu, T.Ishikawa, Y.Okimoto, X.F.Shao, Y.Nakano, H.Yamochi, G.Saito, S.Koshihara
  • Journal Title: J.Phys.Conf.Set. 148 Pages: 12008-12008
  • Peer Reviewed
• [Journal Article] The future of photo-induced phase transition (PIPT) -How fast and slow it can be changed?- (2009)
  • Author(s): A.Tomita, S.Koshihara, S.Adachi, J.Itatani, K.Onda, S.Ogihara, Y.Nakano, H.Yamochi
  • Journal Title: J.Phys.Conf.Ser. 148 Pages: 12066-12066
  • Peer Reviewed
• [Journal Article] Photoinduced insulator-metal transition in Pr_<0.5>Ca_<0.5>CoO_3 as studied by femtosecond spectroscopy (2009)
  • Author(s): Y.Okimoto, X.Peng, M.Tamural, T.Morita, K.Onda, T.Ishikawa, S.Koshihara, N.Todoroki, T.Kyomen, M.Itoh
  • Journal Title: J.Phys.Conf.Ser. 148 Pages: 12019-12019
  • Peer Reviewed
• [Journal Article] Probing the photo induced phase transition in (C_2H_5)_2(CH_2)_2Sb[Pd(dmit)_2]_2 (2009)
  • Author(s): N.Fukazawa, T.Ishikawa, R.Nakajima, Y.Matsubara, M.Kitayama, S.Koshihara, Y.Okimoto, K.Onda, M.Lorenc, E.Collet, M.Tamura, R.Kato
  • Journal Title: J.Phys.Conf.Ser. 148 Pages: 12003-12003
  • Peer Reviewed
• [Journal Article] J.Itatani, M.Rini, A.Cavalleri, K.Onda, T.Ishikawa, S.Ogihara, S.Koshihara, X.F.Shao, Y.Nakano, H.Yamochi, G.Saito, R.W.Schoenlein (2009)
  • Author(s): Ultrafast Gigantic Photo-Response in Charge-Ordered Organic Salt (EDO-TTF)_2PF_6 on 10-fs time scales
  • Journal Title: Ultrafast Phenomena XVI, Springer-Verlag, Berlin Pages: 185-187
  • Peer Reviewed
• [Journal Article] The photo-induced phase transition in Et_2Me_2Sb[Pd(dmit)_2]_2 (2009)
  • Author(s): T.Ishikawa, N.Fukazawa, Y.Matsubara, R.Nakajima, K.Onda, Y.Okimoto, S.Koshihara, M.Tamura, R.Kato, M.Lorenc, E.Cal let
  • Journal Title: Phys.Stat.Sol. (C)6 Pages: 112-115
  • Peer Reviewed
• [Journal Article] Femtosecond time-resolved reflection spectroscopy in Pr_<1-x>Ca_xMnO_3(x=0.37) (2009)
  • Author(s): X.Peng, Y.Oki moto, M.Endo, K.Sato, T.Aizawa, K.Onda T.Tshikawa, S.Koshihara, T.Arima
  • Journal Title: Phys.Stat.Sol. (C)6 Pages: 252-255
  • Peer Reviewed
• [Journal Article] Large and ultrafast photoinduced reflectivity change in the charge separated phase of Et_2Me_2Sb[Pd(dmit)_2]_2 (2009)
  • Author(s): T.Ishikawa, 他
  • Journal Title: Phys.Rev.B 80 Pages: 115108-115108
  • Peer Reviewed
• [Journal Article] Ultrasonic propagation of a metallic domains in Pr_0.5Ca_0.5CoO_3 undergoing a photoinduced insulator-metal transition (2009)
  • Author(s): Y.Okimoto, 他
  • Journal Title: Phys.Rev.Lett. 101 Pages: 27402-27402
  • Peer Reviewed
• [Journal Article] (2009)
  • Author(s): 腰原伸也監修
  • Journal Title: 動的構造解析技術がもたらす新しい物質科学(シーエムシー出版]) Pages: 107-123
• [Journal Article] Anomalous photo-induced response by double-pulse excitation in the organic conductor (EDO-TTF)_2PF_6 (2009)
  • Author(s): K. Onda, S. Ogihara, T. Ishikawa, Y. Okimoto, 他
  • Journal Title: J. Phys. Conf. Ser. 148
  • Peer Reviewed
• [Journal Article] Excitation photon energy dependence of photo-induced phase transition in (EDO-TTF)_2PF_6 (2009)
  • Author(s): S. Ogihara, K. Onda, M. Shimizu, T. Ishikawa, 他
  • Journal Title: J. Phys. Conf. Ser. 148
  • Peer Reviewed
• [Journal Article] The future of photo-induced phase transition (PIPT)-How fast and slow it can be changed? - (2009)
  • Author(s): A. Tomita, S. Koshihara, S. Adachi, J. Itatani, 他
  • Journal Title: J. Phys. Conf. Ser 148
  • Peer Reviewed
• [Journal Article] Probing the photo induced phase transition in (C_2H_5)_2(CH_3)_2Sb[Pd(dmit)_2]_2 (2009)
  • Author(s): N. Fukazawa, T. Ishikawa, R. Nakajima, 他
  • Journal Title: J. Phys. Conf. Ser 148
  • Peer Reviewed
• [Journal Article] Photoinduced insulator-metal transition in Pr_<0.5>Ca_<0.5>CoO_3 as studied by femtosecond spectroscopy (2009)
  • Author(s): Y. Okimoto, X. Peng, M. Tamural, T. Morita, 他
  • Journal Title: J. Phys. Conf. Sen 148
  • Peer Reviewed
• [Journal Article] Femtosecond time-resolved reflection spectroscopy in Pr_<1-x>Ca_xMnO_3 (x=0.37) (2009)
  • Author(s): X. Peng, Y. Okimoto, M. Endo, K. Sato, 他
  • Journal Title: Phys. Stat. Sol. (C) 6 Pages: 252-255
  • Peer Reviewed
• [Journal Article] The photo-induced phase transition in Et_2Me_2Sb[Pd(dmit)_2]_2 (2009)
  • Author(s): T. Ishikawa, N. Fukazawa, Y. Matsubara, 他
  • Journal Title: Phys. Stat. Sol. (C) 6 Pages: 112-115
  • Peer Reviewed
• [Journal Article] Photoinduced Change in the Charge Order Pattern in the Quarter-filled Organic Conductor (EDO-TTF)_2PF_6with Strong Electron-Phonon Interaction (2008)
  • Author(s): K.Onda, S.Ogihara, K.Yonemitsu, N.Maeshima, T.Ishikawa, Y.Okimoto, X.F.Shao, Y.Nakano, H.Yamochi, G.Saito, S.Koshihara
  • Journal Title: Phys.Rev.Lett. 101
  • Peer Reviewed
• [Journal Article] The Photo-Induced Phase and Coherent Phonon in the Organic Conductor (EDO-TTF)_2PF_6 (2008)
  • Author(s): K.Onda, S.Ogihara, T.Ishikawa, Y.Okimoto, X.F.Shao, H.Yamochi, G.Saito, S.Koshihara
  • Journal Title: J.Phys.Cond.Mat. 20
  • Peer Reviewed
• [Journal Article] The Photo-Induced Phase and Coherent Phonon in the Organic Conductor(EDO-TTF)_2PF_6 (2008)
  • Author(s): K. Onda, S. Ogihara, T. Ishikawa, Y. Okimoto, 他
  • Journal Title: J. Phys. Cond. Mat 20
  • Peer Reviewed
• [Journal Article] Photoinduced Change in the Charge Order Pattern in the Quarter-filled Organic Conductor (EDO-TTF)_2PF_6 with Strong Electron-Phonon Interaction (2008)
  • Author(s): K. Onda, S. Ogihara, K. Yonemitsu, N. Maeshima, 他
  • Journal Title: Phys. Rev. Lett. 101
  • Peer Reviewed
• [Journal Article] Acceleration of domain wall movement by photoirradiation in perovskitetype cobaltite
  • Author(s): Y.Okimoto, 他
  • Journal Title: Phys.Rev.B Volume: (in press)
  • Peer Reviewed
• [Journal Article] Ultrafast and large reflectivity change by ultraviolet excitation of the metallic phase in the organic conductor (EDO-TTF)_2PF_6
  • Author(s): K.Onda, 他
  • Journal Title: Physica B (印刷中)
  • Peer Reviewed
• [Presentation] ime-resolved infrared vibrational spectroscopy for studying dynamics of molecular crystals (2010)
  • Author(s): N.Fukazawa, 他
  • Organizer: 2010 International Chemical Congress of Pacific Basin Societies
  • Place of Presentation: 米国ハワイ州Honolulu
  • Year and Date: 2010-12-17
• [Presentation] ピコ秒VSFG法による単結晶二酸化チタン表面の大気中での観測 (2010)
  • Author(s): 恩田健, 他
  • Organizer: 表面・界面スペクトロスコピー2010
  • Place of Presentation: つくば市 筑波山京成ホテル
  • Year and Date: 2010-12-04
• [Presentation] Dynamics in air of monolayer water on a single crystal TiO2(110) surface using picosecond VSFG spectroscopy (2010)
  • Author(s): K.Onda, 他
  • Organizer: 平成22年度日本分光学会年次講演会
  • Place of Presentation: 京都市 京都大学
  • Year and Date: 2010-11-18
• [Presentation] (EDO-TTF)_<1-x>(MeEDO-TTF)_x]_2PF_6における光誘起相転移:時間分解振動分光 (2010)
  • Author(s): 松原圭孝, 他
  • Organizer: 日本物理学会2010秋季大会
  • Place of Presentation: 大阪府堺市 大阪府立大
  • Year and Date: 2010-09-24
• [Presentation] 電荷移動型錯体(EDO-TTF)_2PF_6における10fsから100psにわたる光誘起ダイナミクス (2010)
  • Author(s): 恩田健, 他
  • Organizer: 第4回分子科学討論会
  • Place of Presentation: 大阪市 大阪大学
  • Year and Date: 2010-09-15
• [Presentation] 時間分解分子振動分光によるEt_2Me_2Sb[Pd(dmit)_2]_2の超高速光誘起現象の探索 (2010)
  • Author(s): 深澤直人, 他
  • Organizer: 第4回分子科学討論会
  • Place of Presentation: 大阪市 大阪大学
  • Year and Date: 2010-09-15
• [Presentation] Dynamics of Monolayer Water on a Single Crystalline TiO_2 Surface in Air by VSFG Spectroscopy (2010)
  • Author(s): K.Onda, 他
  • Organizer: 7th International Symposium on Ultrafast Surface Dynamics
  • Place of Presentation: クロアチアBrijuni Islands
  • Year and Date: 2010-08-26
• [Presentation] Photoinduced Dynamics of a Quasi-1D Organic Conductor over a Range from 10 fs to 100 ps (2010)
  • Author(s): K.Onda, 他
  • Organizer: 17th International Conference on Ultrafast Phenomena
  • Place of Presentation: 米国 Snowmass Village
  • Year and Date: 2010-07-19
• [Presentation] Photoinduced dynamics in a quasi-1D organic conductor on the various time and space scales (2010)
  • Organizer: 日本物理学会2010年年次大会
  • Place of Presentation: 岡山大学(シンポジウム講演)
  • Year and Date: 2010-03-21
• [Presentation] Photoinduced dynamics in a quasi-ID organic conductor on the various time and space scales (2010)
  • Author(s): 恩田健
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山県岡山市
  • Year and Date: 2010-03-21
• [Presentation] Photoinduced phase transition in a quasi-1D organic conductor on the various time scales (2010)
  • Author(s): 恩田健
  • Organizer: Gordon Research Conference on Ultrafast Phenomena In Cooperative Systems
  • Place of Presentation: Galveston, Texas, USA
  • Year and Date: 2010-03-03
• [Presentation] Dynamics of Monolayer Water at a TiO_2(110) Surface in Air by Time-resolved VSFG Spectroscopy (2010)
  • Author(s): 恩田健
  • Organizer: 7th International Workshop on Oxide Surfaces (IWOX-VII)
  • Place of Presentation: 新潟市越後湯沢
  • Year and Date: 2010-01-13
• [Presentation] フェムト秒時間分解フォノン分光による有機電荷移動錯体TTF-CA結晶の光誘起中性-イオン性相転移 (2010)
  • Author(s): 吉田樹史, 他
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 震災の影響により概要集集、Webサイト上のみ
• [Presentation] (EDO-TTF)_<1-x>(MeEDO-TTF)_x]_2PF_6における金属絶縁体転移の赤外分光による研究 (2010)
  • Author(s): 松原圭孝, 他
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 震災の影響により概要集集、Webサイト上のみ
• [Presentation] 時間分解分子振動分光法を用いたEt_2Me_2Sb[Pd(dmit)_2]_2完全電荷分離相における光誘起現象の解明 (2010)
  • Author(s): 深澤直人, 他
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 震災の影響により概要集集、Webサイト上のみ
• [Presentation] ピコ秒VSFG法による酸化物及び有機物単結晶表面の研究 (2009)
  • Author(s): 恩田健
  • Organizer: 表面・界面スペクトロスコピー2009
  • Place of Presentation: 北海道札幌市
  • Year and Date: 2009-12-04
• [Presentation] ピコ秒赤外振動分光法による有機導電体の光誘起相転移ダイナミクス (2009)
  • Author(s): 恩田健
  • Organizer: 平成21年度日本分光会年次講演会
  • Place of Presentation: 東京都目黒区
  • Year and Date: 2009-11-18
• [Presentation] ピコ秒VSFG法よるTiO_2(110)上に吸着した単分子層水分子の大気中における観測 (2009)
  • Author(s): 恩田健
  • Organizer: 第29回表面科学学術講演会
  • Place of Presentation: 東京都江戸川区
  • Year and Date: 2009-10-28
• [Presentation] ピコ秒時間分解振動分光による(EDO-TTF)_2PF_6光誘起相転移過程の観測 (2009)
  • Author(s): 清水実
  • Organizer: 日本物理学会2009秋季大会
  • Place of Presentation: 熊本県熊本市
  • Year and Date: 2009-09-25
• [Presentation] (EDO-TTF)_2PF_6におる光誘起相転移のサブ20フェムト秒ダイナミクス (2009)
  • Author(s): 荻原将
  • Organizer: 日本物理学会2009秋季大会
  • Place of Presentation: 熊本県熊本市
  • Year and Date: 2009-09-25
• [Presentation] 有機導電体(EDO-TTF)_2PF_6におけるピコ秒時間分解振動分光 (2009)
  • Author(s): 清水実
  • Organizer: 第3回分子科学討論会
  • Place of Presentation: 愛知県名古屋市
  • Year and Date: 2009-09-23
• [Presentation] ピコ秒時間分解SFG法による酸化物単結晶表面上の反応ダイナミクス (2009)
  • Author(s): 恩田健
  • Organizer: 第3回分子科学討論会
  • Place of Presentation: 愛知県名古屋市
  • Year and Date: 2009-09-22
• [Presentation] Ultrafast Photoinduced Phase Transitions in (EDO-TTF)_2PF_6 with Strong Electron-Phonon Interaction (2009)
  • Author(s): 恩田健
  • Organizer: The 64th Yamada Conference and The 8th International Symposium on Crsystalline Organic Metals, Superconductors and Ferromagnets (ISCOM2009),
  • Place of Presentation: 北海道ニセコ町
  • Year and Date: 2009-09-13
• [Presentation] Ultrafast dynamics at oxide surfaces by time-resolved SFG spectroscopy (2009)
  • Author(s): 恩田健
  • Organizer: 第25回化学反応討論会
  • Place of Presentation: 埼玉県さいたま市
  • Year and Date: 2009-06-01
• [Presentation] ピコ秒時間分解SFG分光法による酸化物表面ダイナミクスの研究 (2009)
  • Author(s): 恩田健
  • Organizer: シンポジウム「表面・界面を観る非線形分光の新しい展開」
  • Place of Presentation: 埼玉県和光市
  • Year and Date: 2009-03-24
• [Presentation] 固体及び固体表面における超高速光反応ダイナミクス--局在系から非局在系ヘ-- (2009)
  • Author(s): 恩田健
  • Organizer: 平成20年度第1回強光子場科学懇談会
  • Place of Presentation: 東京都目黒区
  • Year and Date: 2009-02-06
• [Presentation] 界面和周波発生振動分光法による表面光化学反応の研究 (2008)
  • Author(s): 恩田健
  • Organizer: 表面・界面スペクトロスコピー2008
  • Place of Presentation: 大阪市
  • Year and Date: 2008-12-06
• [Presentation] 有機伝導体(EDO-TTF)_2PF_6における超高速光誘起ダイナミクス (2008)
  • Author(s): 恩田健
  • Organizer: シンポジウム「分子アンサンブル2008」
  • Place of Presentation: 埼玉県和光市
  • Year and Date: 2008-12-03
• [Presentation] Diverse Ultrafast Photoinduced Dynamics in the Organic Conductor(EDO-TTF)_2PF_6 (2008)
  • Author(s): 恩田健
  • Organizer: 7th International Symposium on Ultrafast Intense Laser Science (ISUILS7)
  • Place of Presentation: 京都市
  • Year and Date: 2008-11-26
• [Presentation] Diverse photoinduced phase transitions in (EDO-TTF)_2PF_6 (2008)
  • Organizer: 3rd Tnternational Conference on Photo-Tnduced Phase Transitions and Cooperative Phenomena (PTPT2008)
  • Place of Presentation: Osaka, Japan
  • Year and Date: 2008-11-11
• [Presentation] Diverse Photoinduced Phase Transitions in (EDO-TTF)_2PF_6 (2008)
  • Author(s): 恩田健
  • Organizer: Yamada Conference LXIII and 3rd International Conference on Photo-Induced Phase Transitions and Cooperative Phenomena (PIPT2008)
  • Place of Presentation: 大阪市
  • Year and Date: 2008-11-11
• [Presentation] 有機伝導体(EDO-TTF)_2PF_6における多彩な光励起ダイナミクス (2008)
  • Author(s): 恩田健
  • Organizer: 第2回分子科学討論会
  • Place of Presentation: 福岡市
  • Year and Date: 2008-09-26
• [Presentation] 有機伝導体(EDO-TTF)_2PF_6における多彩な光励起ダイナミクス (2008)
  • Author(s): 恩田健
  • Organizer: 第24回化学反応討論会
  • Place of Presentation: 札幌市
  • Year and Date: 2008-06-04
• [Book] 動的構造解析技術がもたらす新しい物質科学(応用編第2章)(有機伝導体(EDO-TTF)_2PF_6が示す多彩な光誘起相転移ダイナミクス)(腰原伸也監修) (2009)
  • Publisher: シーエムシー出版
• [Remarks] ホームページ
  • URL: http://www.cms.titech.ac.jp/~koshihara/member/onda/
• [Remarks]
  • URL: http://www.cms.titech.ac.jp/~koshihara/member/onda/index.html