Control of electronic excitation induced by localized surface plasmon resonance

2016 Fiscal Year Final Research Report

• Project/Area Number: 26248001
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Hokkaido University
• Principal Investigator: Kei Murakoshi 北海道大学, 理学研究院, 教授 (40241301)
• Co-Investigator(Kenkyū-buntansha): 保田 諭 北海道大学, 理学(系)研究科(研究院), 准教授 (90400639) ; 南本 大穂 北海道大学, 理学(系)研究科(研究院), 助教 (80757279)
• Co-Investigator(Renkei-kenkyūsha): IKEDA Katsuyoshi 北海道大学, 大学院理学研究院, 准教授 (50321899)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 電気化学 / 局在表面プラズモン / 表面物理化学 / 半導体量子ドット / カーボンナノチューブ / グラフェン / 強結合

Outline of Final Research Achievements

We have revealed that strong coupling states between localized surface plasmons and molecule excitons affect the Raman enhancement. Tuning of the localized surface plasmon resonance energy by changing metal nano-dimer structures leads to the modulation of the hybridized polariton energy of the hybridized system between metal nano-dimer structures and organic dye molecules. Maximum Raman enhancement was obtained at an optimized resonant energy between the hybrid states and Raman excitation. The coupling strength can be controlled by not only the structure of metal nano-dimer, but also the electrochemical potential of the system. The density of free electrons in metal nanostructures as well as the redox states of molecules can be varied by the electrochemical potential of the systems, resulting in the changes of the strong coupling states. The present finding can be extended into general scheme of the control for the light-matter interaction.

Free Research Field

物理化学