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
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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
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