Spatio-temporal characteristics and control of coupled excited states in nano-dot arrays

2014 Fiscal Year Final Research Report

• Project/Area Number: 22225002
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Physical chemistry
• Research Institution: Institute for Molecular Science
• Principal Investigator: OKAMOTO Hiromi 分子科学研究所, 光分子科学研究領域, 教授 (20185482)
• Co-Investigator(Kenkyū-buntansha): NARUSHIMA Tetsuya 分子科学研究所, 光分子科学研究領域, 助教 (50447314)
• Research Collaborator: IMURA Kohei ; NISHIYAMA Yoshio ; JIANG Yuqiang ; LIM Jong Kuk ; KOWAKA Yasuyuki ; WU Hui Jun ; HASHIYADA Shun
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: ナノ材料 / 走査プローブ顕微鏡 / 近接場 / プラズモン / 金属ナノ構造 / 電子線描画 / 励起状態相互作用

Outline of Final Research Achievements

This research aimed principally at revealing space-time structures of optical fields in metal nanostructures and plasmonic interactions that determine the field structures, through near-field optical imaging and analysis. We found characteristic optical field structures in 1- and 2-dimensional array structures of metal nanoparticles, and the results were intepreted in terms of a simple model of inter-particle interaction. We also obtained some intriguing results on ultrafast dynamics and other basic nano-optical characteristics of metal nanostructures. We further extend the research to studies on optical activity in nanospace. A novel near-field circular dichroism microscope was constructed, and local optical activity of metal nanostructures was visualized. We found that metal nanoparticles yield locally very strong optical activity, and that even highly symmetric achiral nanostructures gave local optical activity.

Free Research Field

物理化学