Dielectric properties of silver-gelatin granular suspensions

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Abstract
Recently, some authors have employed a lattice-gas version of the coherent-potential approximation (LG-CPA) to describe the optical properties of composites formed by the suspension of Ag grains in a gelatin host. We show here that a direct approach to structural disorder, based on Roth’s effective-medium approximation (EMA), yields results that are, at least, of comparable accuracy to those of the LG-CPA. The dependence of the EMA dielectric function on the input parameters that characterize metal-insulator suspensions is examined and found to be physically reasonable.