NUMERICAL-SIMULATION OF THE MEAN-FIELD IN A COMPOSITE MEDIUM

We develop a volume integral method in order to compute the electric f ield within a one-dimensional composite layer above a substrate upon w hich a normal p-polarized plane wave impinges. Almost all interactions are taken into account since the field is calculated exactly by a mom ent method. A Monte Carlo simulation yields the mean field. The effect ive dielectric constant is computed by fitting the results with the an alytical expression of the field in a homogeneous layer. We focus our attention on the case of granular metallic films above a dielectric su bstrate. The peak of resonance and the influence of the substrate are studied.