Davydova O. Optical properties of composites based on nonlinear dielectrics and metals.

Theoretical study of light interaction with composites based on nonlinear dielectrics and metals (CNDM) is performed. It is investigated plane layered structures as well as matrix dispersed systems with spherical or ellipsoidal inclusions having two layers, the inclusion kernel being a nonlinear dielectric with the cubic nonlinearity while the matrix being a linear dielectric with no absorption. Methods for calculation the effective nonlinear both permittivity and permeability of the systems are developed by using general methods of the electrodynamics of non-homogeneous media. Effects of the resonance light absorption by the surface plasmons on amplification both the local field and the nonlinear addition to permittivity are studied in detail. Light transmission and scattering by thin films on CNDM base under a constant potential (about 10 V) are calculated. Maximum transmittance value for some types of films is shown to be approach 70%, with the value 5% under absence of the constant field. The internal optical bistability (IOB) in CNDM is analyzed in full. For all the systems it is studied the conditions of IOB rising as well as numerical calculations of the IOB region is carried out and the influence of the system parameters on the IOB character is analyzed. The IOB is shown to be rising only in that frequency region where the surface plasmons can exist. Finally, it is studied the influence of shape and filling factor of the inclusions on the IOB both rising and bounds.