Maxwell Garnett Model for Dielectric Mixtures Containing Conducting Particles at Optical Frequencies

Mathematical modeling of composites made of a dielectric base and randomly oriented metal inclusions is considered. Different sources of frequency dependency of metal conductivity at optical frequencies are taken into account. These include the skin-effect, dimensional length-size resonance of metal particles, and the Drude model. Also, mean free path of electrons in metals can be smaller than the characteristic sizes of nanoparticles, and this leads to the decrease in conductivity of metal inclusions. These effects are incorporated in the Maxwell Garnett mixing formulation, and give degrees of freedom for forming desirable optical frequency characteristics of composite media containing conducting particles.