Eur. Phys. J. Appl. Phys.
Volume 85, Number 3, March 2019
|Number of page(s)||8|
|Section||Imaging, Microscopy and Spectroscopy|
|Published online||26 April 2019|
Speckle decorrelation with wavelength shift as a simple way to image transport mean free path
Univ Rennes, CNRS, Institut de Physique de Rennes, UMR 6251, Rennes, France
2 Univ Rennes, CNRS, Institut FOTON, UMR 6082, Rennes, France
* e-mail: email@example.com
Received in final form: 8 January 2019
Accepted: 4 February 2019
Published online: 26 April 2019
We present an experimental scheme for determining the light transport properties of random disordered materials. The sample is illuminated with a laser and the speckle patterns obtained at different wavelengths are recorded with a camera. The transport mean free path is then deduced from the correlation functions of the scattered intensities. This method is tested on two kinds of random materials: colloidal particles dispersed into a polymeric matrix and on granular material made of glass beads. The possibility to image a material with a disorder varying at large scale is finally presented.
© A. Mikhailovskaya et al. published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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