Light Transport in Photonic Glasses

Orateur : Geoffroy AUBRY (Universität Konstanz, Germany)

In disordered enough media, diffusion of waves can come to a halt : this is the so-called Anderson localization. It has been first observed in electronic systems (metal/insulator transition), then with ultra sound or cold atoms, but never for light in 3D. One reason for that could be that the studied samples were not disordered enough, in other words, did not scatter enough. Monodisperse photonic glasses are one way to achieve more scattering by using the resonant properties of the single scatterers. To better understand light transport in such materials, we present a model that combines the scattering properties of a concentrated interacting Mie-scatterer suspension embedded in a medium having a refractive index calculated by the energy-density coherent-potential approximation. The validity of the model is confirmed by already published and new experimental data in polystyrene and titania photonic glasses, as well as compared with numerical simulations using different ab-initio codes (Meep and MSTM).

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