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We provide a general microscopic theory of the scattering cross-section andof the refractive index for a system of interacting colloidal particles, exactat second order in the molecular polarizabilities. In particular: a) we showthat the structural features of the suspension are encoded into the forwardscattered field by multiple scattering effects, whose contribution is essentialfor the so-called "optical theorem" to hold in the presence of interactions; b)we investigate the role of radiation reaction on light extinction; c) wediscuss our results in the framework of effective medium theories, presenting ageneral result for the effective refractive index valid, whatever thestructural properties of the suspension, in the limit of particles much largerthan the wavelength; d) by discussing strongly-interacting suspensions, weunravel subtle anomalous dispersion effects for the suspension refractiveindex.

Optical extinction, refractive index, and multiple scattering for suspensions of interacting colloidal particles