Study on Dynamics of Plasmon-Induced Charge Carriers under the Modal Strong Coupling Conditions
| 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 |
石 旭 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 |
Granted (Fiscal Year 2020)
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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 absorption / Strong coupling / Electron transfer / 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 Annual Research Achievements |
Based on the study of the charge transfer at the interface between Au-NPs and TiO2 using ultrafast transient measurement, we have successfully evaluated the critical parameters that affect the charge transfer at the interface of Au-NPs/TiO2 under the strong coupling conditions. In this year, 1) the strong coupling between the plasmon resonance of Au-NPs and the cavity resonance is verified to be strongly determined by the local electric field in the cavity, which was demonstrated from the far-field absorption spectra on a structure consisting of Au-NPs inlaid inside the TiO2/Au-film cavity. (2) We constructed the visible-pump and IR-probe transient spectroscopy with reflection configuration to measure the hot-electrton generation. The transient measurement shows that the photo-excited electron generation at Au-NPs/TiO2 interface is strongly related to the local electric field in the cavity as well as the strong coupling conditions.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
According to my proposal, I have successfully developed a strong coupling structure with controllable strong coupling strength and evaluated the effect of the strong coupling strength on the photo-excited electron generation using ultrafast transient measurements. Based on our experimental observations, we might explore the relationship between the strong coupling and the photo-excited electron generation as well as the dynamics of the electron transfer. These observations are especially significant to achieve the goal of this project.
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| Strategy for Future Research Activity |
Next step, I plan to further investigate the relationship between the strong coupling of LSPR and cavity and the hot-electron generation on the developed strong coupling structure, especially the dynamics of the hot-electrons. For this purpose, the number of hot-electrons generation and their dynamics will be measured on the substrate with various strong coupling strengths. Besides, based on the finding of location dependence of hot-electron transfer in the last year, the transport rate of the generated electron to the metal electrode, which is important to understand the charge separation process, will be studied with great effort in addition to the original proposal of hot-hole energy determination.
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Report
(1 results)
Research Products
(3 results)
