5 May 2012 Spectroscopic identification of materials with calibrated full-field optical coherence tomography in the visible range
Author Affiliations +
Proceedings Volume 8430, Optical Micro- and Nanometrology IV; 84300L (2012); doi: 10.1117/12.921539
Event: SPIE Photonics Europe, 2012, Brussels, Belgium
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).
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Antoine Morin, Jean-Marc Frigerio, "Spectroscopic identification of materials with calibrated full-field optical coherence tomography in the visible range", Proc. SPIE 8430, Optical Micro- and Nanometrology IV, 84300L (5 May 2012); doi: 10.1117/12.921539; https://doi.org/10.1117/12.921539
PROCEEDINGS
8 PAGES


SHARE
KEYWORDS
Spectroscopy

Optical coherence tomography

Gold

Reflectivity

Calibration

Visible radiation

Objectives

Back to Top