STUDY OF NON-LINEAR OPTICAL PROPERTIES OF AN ENZ COMPOSITE MATAMATERIAL

Abstract

We designed a non-linear composite metamaterial made up of alternating layers of fused silica glass and silver with thicknesses adjusted so that ε'=0 in the near infrared range., and the structure's optical behaviour is theoretically studied. It shows a shift from negative to positive in the real component of dielectric permittivity as a function of wavelength. we also have studied the variation of ENZ wavelength with thickness of dielectric layer and plasma frequency. By using the Maxwell Garnett theory, we have calculated non linear optical properties, and we find that as we increase the thickness of dielectric material the ENZ wavelength increases along with the increases in real part of non-linear susceptibility. A significant enhancement in nonlinear parameters has been also observed at ENZ wavelength due to the ENZ nature of the composite material.