Seminar: "A few surprises in multiple scattering of light" by Rémi Carminati
Thursday, March 23, 2017 12:00 PM to 1:00 PM
CREOL Room 103
Institut Langevin, ESPCI ParisTech
Light scattering and transport in disordered media has been extensively studied. On the fundamental side, the possibility to study coherent scattering (speckles) in optics has been an essential tool in mesoscopic physics. On the applied side, methods and techniques have been developed for sensing and imaging in complex media. New trends have emerged recently with the possibility to control light propagation using disordered materials.
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.
Rémi Carminati received is PhD in Optical Physics in 1996 from Ecole Centrale Paris (advisor Prof. J.J. Greffet). In 1996-1997 he was a post-doctoral fellow at the Institute of Material Science of Madrid (Spain) in the group of Prof. M. Nieto-Vesperinas. From 1997 to 2007, he was an associate professor (1997-2003) and a professor (2003-2007) at Ecole Centrale Paris (France). Since 2007, he has been a Professor of Physics at ESPCI Paris. His research activity is carried out at the Langevin Institute (http://www.institut-langevin.espci.fr), where he leads the group of Mesoscopic and Theoretical Optics. His works have covered the fields of nanophotonics, plasmonics and light scattering in disordered media. Rémi Carminati received the Fabry-de-Gramont prize of the French Optical Society in 2006 and the Research award from the iXCore Research Foundation in 2009. He was elected a Fellow of the Optical Society of America in 2015.
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