Controlling the propagating features of light through two-dimensional coupled-cavity photonic crystal waveguides

Abstract

The transmission characteristics of the electromagnetic waves through the coupled-resonator optical waveguides based on the two-dimensional oval-rod photonic crystals are studied by the finite-difference time-domain method. The simulated results show that the guided mode region can be controlled by partially changing the circular rods with oval rods adjacent to the cavities, and the oval rods' rotating angles are set to be different. When the rotation angle of the oval rods around one cavity is different from the rotation angle of the oval rods around the adjacent cavities, the group velocities of the guided modes can be greatly reduced and high efficiency of light transmission is insured. And the information of different frequencies can be shared and chosen at the same time by the waveguide branch based on the above structures.