Abstract
The theory of Raman scattering by bulk polaritons in a composite medium is developed. The effective dielectric function of the composite medium is modelled using the Maxwell–Garnett formulation. We apply the fluctuation dissipation theorem to obtain bulk electric field fluctuations. The differential scattering cross section for bulk polaritons is derived, and is found to have a Lorentzian line shape. It is shown that the dispersion relation, electric field fluctuations, damping function and the differential scattering cross section are strongly dependent on the filling factor, f, which is a measure of the constituents of the composite medium. Our results are applied to a composite medium of KCl and Ag.
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