Development of Broadband Infrared Near-Field Spectroscopy System for Phonon Analysis with Nano-meter Order Spatial Resolution

2014 Fiscal Year Final Research Report

• Project/Area Number: 24540340
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: IKEMOTO Yuka 公益財団法人高輝度光科学研究センター, 利用研究促進部門, 副主幹研究員 (70344398)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 赤外近接場分光 / 赤外放射光

Outline of Final Research Achievements

Infrared synchrotron radiation (IR-SR) is a highly brilliant white light source. We are developing an infrared near-field spectroscopy system with an IR-SR light source. The near-field spectroscopy system previously reported comprised an atomic force microscope (AFM) and a commercial Fourier transform infrared (FTIR) spectrometer. In the present study, the configuration of the FTIR interferometer has been modified to an asymmetric one. In the asymmetric interferometer, one beam split by a beamsplitter is focused onto the tip of an AFM probe, and the other beam goes to a movable mirror. The scattered light from the probe and the light reflcted by the movable mirror interfere with each other. The near-field signal is extracted by a modulation method with an AFM oscillation frequency. The signal-to-noise ratio has been improved 6-fold and the signal-to-background ratio is improved 8-fold compared with those observed in the previous system.

Free Research Field

光物性