Microscopy and Microanalysis

Techniques Development

Nanoprobe Fourier-Transform Photoabsorption Spectroscopy Using a Supercontinuum Light Source

Kiyoshiro Ishibea1, Satoru Nakadaa1, Yutaka Meraa1 and Koji Maedaa1 c1

a1 Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-5686, Japan

Abstract

A scheme of photoabsorption spectroscopy based on scanning tunneling microscopy (STM) has been developed by using a supercontinuum light as the wideband light source of a Fourier transform interferometer for spectroscopic measurements. The performance was demonstrated for a sample of GaAs. The proof-of-concept test showed that the use of the supercontinuum light instead of halogen lamps greatly enhances the signal-to-noise ratio due to the high brilliance of the supercontinuum light emitted from a small core of the photonic crystal fiber that enables tight focusing of the spectroscopy light onto the sample beneath the STM tip.

(Received August 22 2011)

(Accepted January 24 2012)

Correspondence:

c1 Corresponding author. E-mail: maeda@exp.t.u-tokyo.ac.jp