Development of localization method of excited states in nanometer-sized areas

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13625
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry
• Research Institution: Osaka University
• Principal Investigator: Ito Syoji 大阪大学, 基礎工学研究科, 准教授 (10372632)
• Co-Investigator(Renkei-kenkyūsha): MORIMOTO Masakazu 立教大学, 理学部, 教授 (70447126)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 超解像顕微鏡法 / 光異性化反応

Outline of Final Research Achievements

We aimed to develop a method to localize the excited state of molecules in very tiny areas. For this purpose, we utilized the photo-isomerization of a diarylethene (DE) derivative. To evaluate the localization of only the closed form of a DE derivative with a high sensitivity, we used fluorescent DEs that show strong fluorescence only in their closed forms. Nanoparticles of the fluorescent DE were prepared for evaluation of nanoscale localization. UV and visible CW laser light were used for ring-closure and ring-opening reactions, respectively. We investigated the intensity and spatial distribution of UV and visible light variously on a single DE nanoparticle on a substrate and searched for the optimum condition of super-resolution localization. As a result, the excited state can be localized in the region of about 45 nm, and super-resolution localization of the excited state based on the proposed concept can be demonstrated.

Free Research Field

ナノ光化学