Research on new type of slow light structure based on 2D photonic crystal coupled cavity waveguide

Abstract

The structure of 2D rods PhC CCW is studied, and it is found that the group velocity discreases quikly with the increase of lattice number between two rod defects. When 7×7 supercell unit is chosen, the largest group velocity νg-max of the guided mode is about 1/251 times that of photonic crystal line defect waveguide. Radius of the four rods around the cavity of the 7×7 supercell unit are adjusted, νg-max of the new strcture can reach 589×10-4c, and it's about 1/5 that of unadjusted structure. Finally, by making comparisons, it is found that the structure has the best slow-light characteristic when the radius of the up and down rods are changed.