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浅原 彰文 Akifumi ASAHARA (D3)

Main Research (collaboration with Ohkoshi Lab. and Tokoro Lab.):
Photoinduced phase transition dynamics in novel optical switching materials
"光スイッチング材料における光誘起相転移ダイナミクスの研究"
Target materials：
cyano-bridged metal complexes RbMn[Fe(CN)6], titanium oxide Ti3O5 etc.
Research Keywords:
ultrafast spectroscopy, photoinduced phase transitions

Sub-research (collaboration with Akiyama Lab.):
Direct observation of ultrashort gain-switched blue pulses from InGaN VCSEL by upconversion technique

CV:
2013- 日本学術振興会特別研究員(DC2, 数物系科学)
2011-2013 G-COEリサーチアシスタント委属

2009- 東京大学大学院理学系研究科物理学専攻 物性研究所
(Institute for Solid State Physics, University of Tokyo)
2005-2009 東京大学工学部航空宇宙工学科
(Dept. of Aeronautics and Astronautics, University of Tokyo)
1999-2005 私立芝学園

Hometown:
埼玉県草加市 (Saitama Pref., Japan)

Hobby:
Ukulele, Chorus, Tennis, Cycling, Shogi, Igo etc...

私の夢：
光物性物理と天文・宇宙工学の架け橋になること！

Publication

1. H. Soma, Y. Uenaka, A. Asahara, T. Suemoto, and T. Uchino, “Ultraviolet stimulated emission from high-temperature-annealed MgO microcrystals at room temperature", Appl. Phys. Lett. 106, 041116/1-5 (2015).
2. A. Asahara, S. Chen, T. Ito, M. Yoshita, W. Liu, B. Zhang, T. Suemoto, and H. Akiyama, “Direct generation of 2-ps blue pulses from gain-switched InGaN VCSEL assessed by up-conversion technique", Sci. Rep. 4, 6041/1-4 (2014).
3. A. Asahara, H. Watanabe, H. Tokoro, S. Ohkoshi and T. Suemoto, “Ultrafast dynamics of photoinduced semiconductor-to-metal transition in optical switching nano-oxide Ti3O5”, Phys. Rev. B 90, 014303/1-7 (2014).
4. S. Chen, T. Ito, A. Asahara, M. Yoshita, W. Liu, J. Zhang, B. Zhang, T. Suemoto, and H. Akiyama,“Spectral dynamics of picosecond gain-switched pulses from nitride-based vertical-cavity surface-emitting lasers", Sci. Rep. 4, 4325/1-5 (2014).
5. H. Watanabe, S. Ishige, A. Asahara, H. Tokoro, S. Ohkoshi, and T. Suemoto, “Domain growth and aggregation dynamics in photo-induced phase transition phenomena", J. Lumin. 152, 108-111 (2014).
6. S. Chen, A. Asahara, T. Ito, J. Zhang, B. Zhang, T. Suemoto, M. Yoshita, and H. Akiyama, “Gain-switching dynamics in optically pumped single-mode InGaN vertical-cavity surface-emitting lasers",Opt. Exp. 22, 4196-4201 (2014).
7. R. Fukaya, A. Asahara, S. Ishige, M. Nakajima, H. Tokoro, S. Ohkoshi, and T. Suemoto, “Probing of local structures of thermal and photoinduced phases in rubidium manganese hexacyanoferrate by resonant Raman spectroscopy", J. Chem. Phys. 139, 084303/1-7 (2013).
8. A. Asahara, M. Nakajima, R. Fukaya, H. Tokoro, S. Ohkoshi and T. Suemoto, “Ultrafast dynamics of reversible photoinduced phase transitions in rubidium manganese hexacyanoferrate investigated by midinfrared CN vibration spectroscopy”, Phys. Rev. B 86, 195138/1-9 (2012).
9. A. Asahara, M. Nakajima, R. Fukaya, H. Tokoro, S. Ohkoshi and T. Suemoto, “Growth Dynamics of Photoinduced Phase Domain in Cyano-Complex Studied by Boundary Sensitive Raman Spectroscopy”, Acta Phys. Pol. A 121, 375-378 (2012).
10. A. Asahara, M. Nakajima, R. Fukaya, H. Tokoro, S. Ohkoshi, and T. Suemoto, “Photo-induced phase switching dynamics in RbMn[Fe(CN)(6)] probed by accumulation free mid-infrared spectroscopy", Phys. Stat. Sol. (b) 248, 491-494 (2011).
11. T. Suemoto, R. Fukaya, A. Asahara, M. Nakajima, H. Tokoro, and S. Ohkoshi, “Dynamics of photoinduced phase transitions in hexacyanoferrate studied by infrared and Raman spectroscopy", Phys. Stat. Sol. (b) 248, 477-481 (2011).

Presentation

1. (ポスター)浅原彰文,渡邊浩, 所裕子, 大越慎一, 末元徹, “光スイッチング物質Ti3O5 ナノ粒子における金属-半導体相転移ダイナミクス”, ISSPワークショップ 機能物性融合科学研究会シリーズ(1)「光機能」, 東京大学, 2014年12月.
2. (invited, oral) T. Suemoto, A. Asahara, H. Watanabe, H. Tokoro, and S. Ohkoshi, "Ultrafast dynamics of photo-reversible insulator-metal phase transitions in nano-crystalline Ti3O5", International Conference on Phase transition and Dynamical properties of Spin Transition Materials (PDSTM 2014), Hongo, Japan, November 2014.
3. (poster) A. Asahara, H. Watanabe, H. Tokoro, S. Ohkoshi and T. Suemoto, "Dynamics of photoinduced semiconductor-to-metal transition in an optical switching nano-oxide Ti3O5", the 5-th International Conference on Photoinduced Phase Transitions and Cooperative Phenomena (PIPT5), Bled, Slovenia, June 2014.
4. (ポスター)浅原彰文,渡邊浩, 所裕子, 大越慎一, 末元徹, “Ti3O5 ナノ粒子における光誘起半導体-金属転移ダイナミクス”, 日本物理学会第69回年次大会, 東海大学, 2014年3月.
5. (口頭発表) S. Q. Chen, T. Ito, A. Asahara,M. Yoshita, J. Y. Zhang, B. P. Zhang, T. Suemoto, and H. Akiyama, “Generation dynamics of picosecond gain-switched pulses from InGaN VCSELs”, 日本物理学会第69回年次大会, 東海大学, 2014年3月.
6. (口頭発表)浅原彰文,渡邊浩, 所裕子, 大越慎一, 末元徹, “λ-Ti3O5 ナノ粒子における局在キャリアを反映したTHz光学伝導度特性”, 日本物理学会2013年秋季大会, 徳島大学, 2013年9月.
7. (poster) H. Watanabe, S. Ishige, Akifumi Asahara, Hiroko Tokoro, Shin-ichi Ohkoshi, and Tohru Suemoto, "Domain growth and aggregation dynamics in Photo-induced phase transition phenomena"; 18th International Conference on Dynamical Processes in Excited States of Solids (DPC2013), Fuzhou, August 2013.
8. (口頭発表)浅原彰文, 所裕子, 大越慎一, 末元徹, “RbMnFeシアノ錯体の光誘起相転移におけるファラデー回転の時間分解測定”, 日本物理学会第68回年次大会, 広島大学, 2013年3月.
9. (ポスター)渡邊浩, 石毛俊, 浅原彰文, 所裕子, 大越慎一, 末元徹, “RbMnFe(CN)6におけるFe-Mnペアに着目した相転移現象の理論モデルの構築”, 日本物理学会第68回年次大会, 広島大学, 2013年3月.
10. (poster) A. Asahara, H. Tokoro, S. Ohkoshi and T. Suemoto, "Ultrafast Faraday Rotation in Rubidium Manganese Hexacyanoferrate", GCOE International Symposium on Physical Sciences Frontier, #1-17, Tokyo, Japan, December 2012.
11. (ポスター)石毛俊, 深谷亮, 浅原彰文, 所裕子, 大越慎一, 末元徹, “シアノ錯体の光誘起相転移におけるドメイン成長過程の励起強度依存性”, 日本物理学会2012年秋季大会, 横浜国立大学, 2012年9月.
12. (oral)A. Asahara, M. Nakajima, S. Ishige, H. Tokoro, S. Ohkoshi and T. Suemoto, “Ultrafast Faraday effect in a photoinduced magnetic phase transition of rubidium manganese hexacyanoferrate”, the 10th International Conference on Excitonic Proc esses in Condensed Matter, Nanostructured and Molecular Materials (EXCON 2012), Groningen, the Netherlands, July 2012.
13. (ポスター)浅原彰文, 中嶋誠, 深谷亮, 石毛俊, 所裕子, 大越慎一, 末元徹, "シアノ錯体における光誘起ドメイン成長過程の観測,” 日本物理学会第67回年次大会, 関西学院大学, 2012年3月.
14. (口頭発表)浅原彰文, 中嶋誠, 深谷亮, 所裕子, 大越慎一, 末元徹, "シアノ錯体の光誘起相転移におけるフェムト秒相境界ダイナミクス,” 日本物理学会2011年秋季大会, 講演概要集 p. 718, 富山大学, 2011年9月.
15. (poster) A. Asahara, M. Nakajima, R. Fukaya, H. Tokoro, S. Ohkoshi and T. Suemoto, "Growth dynamics of photoinduced phase domain in cyano-complex studied by boundary sensitive Raman spectroscopy", the 4-th International Conference on Photoinduced Phase Transitions and Cooperative Phenomena (PIPT4), Wroclaw (Poland), June 2011.
16. (口頭発表)浅原彰文, 中嶋誠, 深谷亮, 所裕子, 大越慎一, 末元徹, “RbMnFeシアノ錯体における双方向光誘起相転移のフェムト秒C≡N振動分光,” 日本物理学会第66回年次大会, 講演概要集 p. 738, 新潟大学, 2011年3月.
17. (poster: PSS Young Researcher Awards) Akifumi Asahara, Makoto Nakajima, Ryo Fukaya, Hiroko Tokoro, Shin-ichi Ohkoshi, and Tohru Suemoto, "Photo-induced phase switching dynamics in RbMn[Fe(CN)6] probed by accumulation free mid-infrared spectroscopy,"; The 9th International Conference on Excitonic and Photonic Processes in Condensed and Nono Materials (EXCON'10), Brisbane, July 2010.
18. (invited, oral) T. Suemoto, R. Fukaya, A. Asahara, M. Nakajima, H. Tokoro, S. Ohkoshi, "Dynamics of photoinduced phase transitions studied by infrared and raman spectroscopy,”The 9th International Conference on Excitonic and Photonic Processes in Condensed and Nano Materials (EXCON'10) Brisbane, July 2010.
19. (ポスター) 浅原彰文, 中嶋誠, 深谷亮, 所裕子, 大越慎一, 末元徹, “低温相RbMnFeシアノ錯体における光誘起相転移ダイナミクスの過渡CN振動分光による観測,” 日本物理学会第65回年次大会, 講演概要集 p. 807, 岡山大学, 2010年3月.