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Nanoprobe Fourier-Transform Photoabsorption Spectroscopy Using a Supercontinuum Light Source

Published online by Cambridge University Press:  03 May 2012

Kiyoshiro Ishibe ,
Satoru Nakada ,
Yutaka Mera  and
Koji Maeda
Kiyoshiro Ishibe
Affiliation:
Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-5686, Japan
Satoru Nakada
Affiliation:
Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-5686, Japan
Yutaka Mera
Affiliation:
Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-5686, Japan
Koji Maeda*
Affiliation:
Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-5686, Japan
*
Corresponding author. E-mail: maeda@exp.t.u-tokyo.ac.jp
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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.

Keywords

scanning tunneling microscopyphotoabsorption spectroscopyFourier transformsupercontinuum lightgallium arsenidesignal-to-noise ratio (SNR)
Type
Techniques Development
Information
Microscopy and Microanalysis , Volume 18 , Issue 3 , June 2012 , pp. 591 - 595
Copyright
Copyright © Microscopy Society of America 2012

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