CAVITY MODES IN DUAL PHONONIC AND PHOTONIC CRYSTAL WITH WIDE ABSOLUTE BANDGAP

Abstract

In this paper, we discuss theoretically the simultaneous existence of dual phononic and photonic band gaps and cavity modes in a PhoXonic crystal. The cavity is created in the center of a square lattice PhoXonic crystal made from silicon using the one-missing-holes point defect (L1). Following the design, dispersion diagrams and the resonant frequency are numerically analyzed by the finite elements method (FEM). Optimization of the PhoXonic crystal design by modulating the structure parameter yields a complete phononic gap together with a photonic gap. Furthermore, we demonstrate the existence of the largest number of cavity modes with a high quality factor of 105. This structure configuration design shows considerable promise as regards the simultaneous confinement of acoustic and optical waves and thus more attractive for experimental observation of optomechanical coupling.