Demonstration of strong coupling between plasmon and single molecule exciton and application to increase efficiency of single molecule photoisomerization reaction

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04935
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 30020:Optical engineering and photon science-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Itoh Tamitake 国立研究開発法人産業技術総合研究所, 生命工学領域, 上級主任研究員 (00351742)
• Co-Investigator(Kenkyū-buntansha): 山本 裕子 北陸先端科学技術大学院大学, 先端科学技術研究科, 准教授 (00598039)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 表面増強分光 / 準放射型プラズモン / 超放射型プラズモン / 銀ナノ粒子 / 銀ナノワイヤー

Outline of Final Research Achievements

In this study, we developed a method to observe the enhancement phenomenon of molecular optical response within HS using two types of hot spots (HS). The first type of HS used a region with a silver nanoparticle (NP) dimer gap number nm^3, and the second type used a silver nanowire (NW) dimer gap. We found that the spectral shapes of LPR scattering and SERS of silver NP dimers are sometimes the same and sometimes very different. Analysis revealed that quasi-radiative LPR exhibits electric field enhancement. Furthermore, it was revealed that a similar case occurs in the HS of silver NW dimer. In addition, in the case of silver NW dimer HS, it was revealed that propagating plasmons also contributed to the enhancement effect. These findings are essential for the development of photochemical reaction measurement methods using HS.

Free Research Field

量子光学

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は、準放射型プラズモン共鳴が表面増強分光などのプラズモニクスに普遍的に重要であることを示したことである。
本研究の社会的意義は、この学術的意義を世界中で幅広く読まれている総説誌（Chemical Reviews 123 (4), 1552-1634, 2023）に掲載したことである。