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Proceedings Paper

Scanning near-field infrared microscope with a free electron laser illumination source
Author(s): Mi Kyung Hong; Shyamsunder Erramilli; Philip Huie; Gregory E. James; Andrew Gee Jeung
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Paper Abstract

We have developed a scanning near-field infrared microscope (SNIM) that utilizes the Stanford picosecond free electron laser as its illumination source. Infrared spectroscopy is a sensitive technique for characterizing materials. However, the spatial resolution of conventional infrared microscopy is limited to a few micrometers due to diffraction. The SNIM overcomes this limitation by using infrared near-field optics to obtain sub-wavelength resolution. The system is built around a near-field scanning optical microscope (NSOM) head, in which a tapered infrared transmitting fiber is mounted as the scanning probe. The Stanford picosecond free electron laser, which provides high power infrared radiation with a wavelength that is continuously tunable from 3 to 15 micrometers, is then coupled to the fiber. In combination with the FEL, the SNIM can obtain infrared spectra of localized regions smaller than one micrometer and acquire images at a chosen wavelength with sub-micrometer resolution. The most promising aspect of SNIM is in the development of 'vibrational nanospectroscopy.' Images have been obtained of biological tissue such as kidney sections using the intrinsic amide absorption in the tissue proteins to provide contrast, instead of relying on an externally introduce stain or marker. Images of lithographically patterned semiconductor samples have also been obtained, revealing subsurface features in gallium arsenide.

Paper Details

Date Published: 1 November 1996
PDF: 10 pages
Proc. SPIE 2863, Current Developments in Optical Design and Engineering VI, (1 November 1996); doi: 10.1117/12.256258
Show Author Affiliations
Mi Kyung Hong, Princeton Univ. (United States)
Shyamsunder Erramilli, Boston Univ. (United States)
Philip Huie, Stanford Univ. Medical Ctr. (United States)
Gregory E. James, Stanford Univ. (United States)
Andrew Gee Jeung, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 2863:
Current Developments in Optical Design and Engineering VI
Robert E. Fischer; Warren J. Smith, Editor(s)

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