All-optical switching in a high- Q Fabry–Perot cavity filled with a quadratic material

Abstract

A theoretical analysis of the nonlinear quadratic interaction between two monochromatic plane waves at frequencies and 2 in a Fabry-Perot cavity shows that all-optical control of reflectivity and transmissivity of the fundamental beam is possible under suitable conditions. We report all-optical switching of the fundamental beam for cavity lengths that vary from a few micrometers to a few millimeters. Specifically, we show that 100% all-optical switching can occur for a 6-m cavity when the nonlinear coefficient is not greater than 20 pm/V and the input intensity does not exceed 10 GW/cm 2. Our analytical results are obtained without use of the slowly varying envelope approximation and without resort to the undepleted-pump approximation.

Acousto-optic interaction in photonic crystals with defects

“…Due to the periodic dielectric constant induced photonic band gaps ͑PBGs͒, PCs have shown attractive applications in signal processing, optical communications, and even photovoltaic panels. [3][4][5][6] However, if the periodicity is broken by inducing a defect into a PC, localized defect modes may appear inside the band gap, which is the fundamental of PC based waveguides and microcavities. In the simplest one-dimensional ͑1D͒ case, both high-Q factor defect mode filters and flat-top band-pass filter have been demonstrated.…”