Effects of temperature on the fundamental mode in an L3 cavity of a photonic crystal slab

Abstract

In this work we investigate the effects of temperature on the confined mode in an L3 cavity of two-dimensional photonic crystal slabs. The structure is composed of a GaAs slab and a two-dimensional photonic crystal consisting of SiO2 holes arranged in a hexagonal lattice. We will use the guided-mode expansion method for the calculation of the photonic band structure and the quality factor. The theoretical results reveal that as the temperature increases, the optical contrast also increases owing to the thermo-optical effects, causing the photonic band structure to shift to shorter frequencies for the TE-like and TM-like modes. Additionally, a greater confinement of the fundamental mode is found upon increasing the temperature and considering the lateral shift of the holes in the cavity.