Rayleigh scattering and weak localization: Geometric effects and fluctuations

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Abstract
The coherently backscattered light from a disordered medium occupying a half space is discussed. For oblique incidence of the incident light it is shown that the coherently backscattered light is confined to a cone of roughly elliptical cross section (it is circular for normal incidence). The effects of lower dimensionality (two dimensions) and absorption on the coherent backscattering are discussed. The fluctuations in the intensity are discussed and in the diffusion approximation shown to obey a Rayleigh distribution. The light scattered at different angles is shown to be uncorrelated.