Prototype of Time-resolved Magnetic Circular Dichroism Spectroscopic Nanoscope Using Scanning Tunneling Microscope

2017 Fiscal Year Final Research Report

• Project/Area Number: 26390027
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials engineering
• Research Institution: Shiga University of Medical Science
• Principal Investigator: Mera Yutaka 滋賀医科大学, 医学部, 教授 (40219960)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 走査トンネル顕微鏡 / 磁気円二色性 / 探針増強効果

Outline of Final Research Achievements

A new experimental system of microscopic nano-spectroscopy was prototyped, combining magnetic circular dichroism spectroscopy and scanning tunneling microscope with atomic resolution. From the consideration of local optical field enhancement in the vicinity of a metal tip, it was found that optical field enhancement is very weak when circular polarization modulation is used, as compared with ordinary light STM. As a sample candidate for dichroic spectroscopy, structural evaluation of amyloid beta at the atomic level was performed. Fibrils and aggregation nuclei of amyloid beta were observed by scanning probe microscopes.

Free Research Field

表面科学、ナノ構造