2020 Fiscal Year Research-status Report
Study on Dynamics of Plasmon-Induced Charge Carriers under the Modal Strong Coupling Conditions
| Project/Area Number |
20K15113
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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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| Keywords | Transient absorption / Strong coupling / Electron transfer |
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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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| Causes of Carryover |
Since the serious period of COVID-19, the amount of travel expenses is saved and this remaining amount of funds will be used for upgrading optics for transient measurement and the publication cost in the next year.
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Research Products
(3 results)
