Optical field enhanced nonlinear optical performance of chalcogenide nanocomposite-based 1D photonic crystal

Abstract

.The optical field enhanced nonlinear optical (NLO) absorption of spin-coated 10-layer and 20-layer 1D photonic crystal structures is demonstrated. A significant 2.5 fold increase in the two-photon absorption coefficient is reported for multilayer structures as compared to a single layer of semiconductor nanocomposite (NC) having a comparable thickness. Under high-intensity illuminance, increased nonlinear absorption could be accredited to the confinement of the optical field due to the localization of intensity. The carefully engineered multilayer structures embedded with semiconductor NCs can provide an attractive approach to designing practical NLO limiters and switches.