Recent developments in multiple light scattering from disordered turbid media such as colloidal suspensions are outlined. Interferences between time reversed scattering paths give rise to a coherent enhancement of the back-scattered intensity α. Its dependence on angle and on absorption can be described, in the diffusion approximation, as a function of the length distribution of the scattering paths. Dynamic fluctuations of α arising from Brownian motion of the scatterers are described similarly. Our experiments demonstrate the quantitative analogy between the time autocorrelation function and the dependence of α on scattering angle and absorption. This makes possible to study single particles dynamics even under conditions of strong multiple scattering and to probe motion at small time and distance scales not accessible in single light scattering. The effects of interparticle interactions are briefly discussed.
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Maret et al. (1989) studied this question.
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