https://doi.org/10.1051/epjap/2019180297
Regular Article
Speckle decorrelation with wavelength shift as a simple way to image transport mean free path
1
Univ Rennes, CNRS, Institut de Physique de Rennes, UMR 6251, Rennes, France
2
Univ Rennes, CNRS, Institut FOTON, UMR 6082, Rennes, France
* e-mail: jerome.crassous@univ-rennes1.fr
Received:
5
October
2018
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.
