| Project/Area Number |
20K15113
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 28020:Nanostructural physics-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
Shi Xu 北海道大学, 創成研究機構, 准教授 (20749113)
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| Project Period (FY) |
2020-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | transient spectroscopy / strong coupling / electron dynamics / plasmon / cavity / Strong Coupling / Transient absorption / Electron transfer / Pump-probe / Plasmon resonance / Strong coupling / Carrier Dynamics / Transient Spectroscopy / Modal Strong Coupling / Cavity / Plasmon |
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| Outline of Research at the Start |
申請者は局在プラズモンとナノ共振器の強結合に基づき幅広い波長域の光を捕集することが可能な金ナノ微粒子/酸化チタン/金膜の積層構造を開発し、その強結合した電極における、光エネルギー変換の量子収率の増大を明らかになった。本研究では、強結合した電極における、光エネルギー変換の量子収率の増大のメカニズムを理解するため、フェムト秒時間分解分光測定により、強結合した光誘起電子移動反応ダイナミクスの解明を目指す。
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| Outline of Final Research Achievements |
In this study, I focused on the dynamics of plasmon-induced electron under the strong coupling conditions. By constructing a Au-NPs/TiO2/Au-film structure with Au-NPs fully inlaid inside the TiO2, the strong coupling between the plasmon resonance of Au-NPs and the cavity resonance is verified to be strongly determined by the electric field in the cavity. Using this coupling strength tunable nanostructures, we studied the electron transfer from Au-NPs to TiO2 as well as the electron-electron, electron-phonon coupling of Au-NPs using transient spectroscopy with a reflection configuration. We found that under the strong coupling conditions, a higher photo-induced electron transfer was observed. In addition, based on the study of electron-electron coupling and electron-phonon coupling of Au-NPs, we found that the electron-electron coupling and/or electron-phonon coupling of Au-NPs were modified under the strong coupling conditions.
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| Academic Significance and Societal Importance of the Research Achievements |
Understanding of the enhanced photochemical reactions in the modal strong coupling system by exploring the dynamics of the plasmon-induced electron transfer and the electron-electron, electron-phonon coupling will be beneficial for the future development of plasmonic solar energy conversion system.
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