CREOL Room 103
Institut Langevin, ESPCI ParisTech
In this talk we will review recent results in the theory of light transport (diffusion) and scattering (speckles) that predict unexpected behaviors of interest for the control of light matter--interaction.
We will discuss an invariance property of the average path length in a wave diffusion process , and the first measurement demonstrating this invariance .
In the study of speckle patterns, we will show that a spatial correlation between the reflected and transmitted intensities persists even in the multiple scattering regime . This makes possible to quantify the level of information on a transmitted speckle that can be deduced from a measurement of the reflected part only. We will finally address the influence of correlations in the disorder on the scattering strength. In the case of hyperuniform materials (a specific class of correlated materials), we will show that disordered materials that are both dense and transparent can be designed .
I am indebted to O. Leseur, N. Fayard, A. Goetschy and R. Pierrat with whom most of this work was done.