Diffusive transport of light in two-dimensional granular materials

Details Diffusive transport of light in two-dimensional granular materials Diffusive transport of light in two-dimensional granular materials

2012-03-18

arxiv.org/abs/1203.3938v1

Phys. Rev. E 84, 051305 (2011)

Physics

Optics

9 pages, 3 figures

Scientific paper

10.1103/PhysRevE.84.051305

We study photon diffusion in a two-dimensional random packing of monodisperse disks as a simple model of granular material. We apply ray optics approximation to set up a persistent random walk for the photons. We employ Fresnel's intensity reflectance with its rich dependence on the incidence angle and polarization state of the light. We present an analytic expression for the transport-mean-free path in terms of the refractive indices of grains and host medium, grain radius, and packing fraction. We perform numerical simulations to examine our analytical result.

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