Creation of chiral reaction field using nanostructure

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K19003
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 32:Physical chemistry, functional solid state chemistry, and related fields
• Research Institution: Tohoku University
• Principal Investigator: Oshikiri Tomoya 東北大学, 多元物質科学研究所, 准教授 (60704567)
• Project Period (FY): 2022-06-30 – 2024-03-31
• Keywords: 超螺旋光 / プラズモン / キラリティ / 角運動量

Outline of Final Research Achievements

We conducted a detailed investigation into optical chirality in the near field using advanced electromagnetic field simulation. By comparing the characteristics of optical chirality with experimentally measurable enhanced electric-field distribution and its spectrum, we gained valuable insights about the chirality in the near-field. Our innovative approach involves the mode coupling of plasmons exhibited by metal nanostructures with the optical resonator for light-matter interaction in nanospace. Exploiting the quantum coherence phenomenon that arises from the coupling of multiple plasmon particles with an optical cavity, we have successfully implemented a new photochemical reaction field. Notably, our work has resulted in the alignment of plasmonic nanoparticles under coherent interaction, leading to a significant enhancement of their chiroptical response.

Free Research Field

光化学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果により、量子コヒーレンスが近接場・遠方場における光のキラリティを誘起可能な新たな方法論を提案し、さらに内部量子収率の増大、ラマン散乱現象の均一化など、従来とは異なる様式で物質と相互作用することを明らかにした。
さらに、近接場キラリティの方法論として、近接場におけるoptical chiralityを数値シミュレーション的に求め、実験的に計測可能な電場増強と照合する方法論を提案した。
これらの新たな方法論は、従来手法では極めて小さかった円偏光と物質との相互作用を増大させ、新たな光物質科学へと展開可能であると期待される。