Study on Dynamics of Plasmon-Induced Charge Carriers under the Modal Strong Coupling Conditions

2021 Fiscal Year Annual Research Report

• Project/Area Number: 20K15113
• Research Institution: Hokkaido University
• Principal Investigator: 石 旭 北海道大学, 創成研究機構, 准教授 (20749113)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: Strong Coupling / Transient absorption / Electron transfer / Pump-probe / Plasmon resonance

Outline of Annual Research Achievements

This year, using the coupling strength tunable Au-NPs/TiO2/Au-film nanostructures, we measured the photo-induced electron transfer from Au-NPs to TiO2 to clarify the strong coupling effect on the photo-induced electron transfer. We found that under the strong coupling conditions, a higher photo-induced electron transfer was observed. Notably, the distance between the Au-NPs and Au-film also affects the transient measurement.
Besides measuring the photo-induced electron transfer, the electron-electron coupling and electron-phonon coupling of Au-NPs were characterized using white light as a probe in the transient measurement. We found that the electron-electron coupling and/or electron-phonon coupling of Au-NPs were modulated under the strong coupling conditions, which provides us with a method to control the electron decay in metal nanoparticles.

Research Products

• [Int'l Joint Research] Peking University/The Hong Kong Polytechnic University(中国)
  • Country Name: CHINA
  • Counterpart Institution: Peking University/The Hong Kong Polytechnic University
• [Int'l Joint Research] Royal Melbourne Institute of Technology(オーストラリア)
  • Country Name: AUSTRALIA
  • Counterpart Institution: Royal Melbourne Institute of Technology
• [Journal Article] Near-Field Imaging and Time-Domain Dynamics of Photonic Topological Edge States in Plasmonic Nanochains (2021)
  • Author(s): Q. Yan, E. Cao, Q. Sun, Y. Ao, X. Hu, X. Shi, Q. Gong, and H. Misawa
  • Journal Title: Nano Letters Volume: 21 Pages: 9270-9278
  • DOI: 10.1021/acs.nanolett.1c03324
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Highly Sensitive and Spatially Homogeneous Surface-Enhanced Raman Scattering Substrate under Plasmon-Nanocavity Coupling (2021)
  • Author(s): X. Zang, X. Shi, T. Oshikiri, K. Ueno, Y. Sunaba, K. Sasaki, and H. Misawa
  • Journal Title: The Journal of Physical Chemistry C Volume: 125 Pages: 19880-19886
  • DOI: 10.1021/acs.jpcc.1c05788
  • Peer Reviewed
• [Journal Article] Water Oxidation under Modal Ultrastrong Coupling Conditions Using Gold/Silver Alloy Nanoparticles and Fabry-Perot Nanocavities (2021)
  • Author(s): Y. Suganami, T. Oshikiri, X. Shi, H. Misawa
  • Journal Title: Angewandte Chemie International Edition Volume: 60 Pages: 18438-18442
  • DOI: 10.1002/anie.202103445
  • Peer Reviewed
• [Journal Article] Varifocal Metalens for Optical Sectioning Fluorescence Microscopy (2021)
  • Author(s): Y. Luo, C. H. Chu, S. Vyas, H. Y. Kuo, Y. H. Chia, M. K. Chen, X. Shi, T. Tanaka, H. Misawa, Y. Huang, and D. P. Tsai
  • Journal Title: Nano Letters Volume: 21 Pages: 5133-5142
  • DOI: 10.1021/acs.nanolett.1c01114
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Near-Perfect Absorption of Light by Coherent Plasmon-Exciton States (2021)
  • Author(s): D. E. Gomez, X. Shi, T. Oshikiri, A. Roberts, and H. Misawa
  • Journal Title: Nano Letters Volume: 21 Pages: 3864-3870
  • DOI: 10.1021/acs.nanolett.1c00389
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Ultrafast Electron Dynamics of Plasmonic Nanoparticles under Modal Strong Coupling Conditions (2021)
  • Author(s): X. Shi, T. Oshikiri, H. Misawa
  • Organizer: The 102nd CSJ Annual Meeting
• [Presentation] Hot-Electron Dynamics under Modal Strong Coupling Conditions (2021)
  • Author(s): X. Shi, G. He, T. Oshikiri, H. Misawa
  • Organizer: Pacifichem 2021
  • Int'l Joint Research
• [Book] Progress in Nanophotonics 6 (2021)
  • Author(s): X. Shi and H. Misawa
  • Total Pages: 163
  • Publisher: Springer
  • ISBN: 978-3-030-71515-1