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Proceedings Paper

Spectroscopic identification of materials with calibrated full-field optical coherence tomography in the visible range
Author(s): Antoine Morin; Jean-Marc Frigerio
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Paper Abstract

For twenty years Optical Coherence Tomography (OCT) has been interested in imaging in turbid media. Recently, conventional OCT has been extended to spectroscopic investigation (SOCT). For a full-field OCT configuration in the visible range, we show that the interference conditions are not equal in the whole field of view: the effective numerical aperture depends on the observation point. This results in a spectral shift towards higher wavelengths of the OCT spectra, leading to errors in spectroscopic analysis. We propose a general calibration method for SOCT measurements which has been tested within a protocol, to perform spatially-resolved spectroscopic identification of material by OCT. Firstly we measure the reflectivity of a plane gold sample, corresponding closely to the measurement made with a spectrometer. Then we successfully identify the reflectivity of gold in a mixed sample (silicon and gold).

Paper Details

Date Published: 4 May 2012
PDF: 8 pages
Proc. SPIE 8430, Optical Micro- and Nanometrology IV, 84300L (4 May 2012); doi: 10.1117/12.921539
Show Author Affiliations
Antoine Morin, Institut des Nanosciences de Paris, CNRS, Univ. Pierre et Marie Curie (France)
Jean-Marc Frigerio, Institut des Nanosciences de Paris, CNRS, Univ. Pierre et Marie Curie (France)

Published in SPIE Proceedings Vol. 8430:
Optical Micro- and Nanometrology IV
Christophe Gorecki; Anand K. Asundi; Wolfgang Osten, Editor(s)

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