Visualization of optical dynamics at the nanoscale using photoinduced force microscopy

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15119
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 28020:Nanostructural physics-related
• Research Institution: Institute for Molecular Science
• Principal Investigator: Yamanishi Junsuke 分子科学研究所, メゾスコピック計測研究センター, 特別研究員 (00846115)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: 光誘起力顕微鏡 / 光圧 / ナノフォトニクス

Outline of Final Research Achievements

The objective of this research project is to observe the optical response of materials with high spatial and time resolution by using pulse laser light for photoinduced force microscopy. In this study, we first succeeded in developing a home-made photoinduced force microscope in which light can be introduced from the side and just below the tip. However, when pulse laser light was introduced to the tip and the sample, the tip movement was unstable, which was not expected in the original measurement system. Therefore, in this research project, in addition to observing higher-order polarizabilities of the sample, we also tried advanced measurement to observe dipoles arising from the off-diagonal elements of polarizability using the photoinduced force microscope. As a result, we succeeded in observing images reflecting the chirality of materials at the nanoscale.
This measurement were previously not possible.

Free Research Field

ナノフォトニクス

Academic Significance and Societal Importance of the Research Achievements

本研究計画で開発した光誘起力顕微鏡は現存の装置の中で、最も高い信号雑音比を持ってる。そのため、開発した光誘起力顕微鏡を用いて更なる観測を続けていくことで、今後明らかになっていないナノ光学の学理構築が進んできことと考えられる。また、さらなる発展的な光誘起力顕微鏡の観測は、物質の様々な光応答を測定することが可能になり、化学的な材料や生体分子の評価にも応用することが可能になってくると考えられる。