Optical reflector and high Q filter based on two-dimensional photonic-crystal waveguide

摘要

In this paper, we investigated the reflectivity of the reflector based on two-dimensional photonic crystal waveguide on defect's position, defect's radius and defect's index by finite difference time domain method. It is found that the reflectivity of the reflector strongly depends on the position of the defect, the reflectivity increases when the defect moves away from the grid point along the direction perpendicular to the waveguide, and we can obtain reflectivity of almost 100% in some suitable position. Meanwhile, we discuss that the reflectivity change with the defect's radius and its refractive index. Moreover, we have designed and simulated a high quality factor (Q) filter constructed by one-defect reflectors in a simple structure. In our design, the Q will be increased by three times without any more constructional complexity.