Wide band slow light with large NDBPat any group index in photonic crystal waveguide

Abstract

Based on combining material schemes and structure optimizing of two-dimensional triangular lattice photonic crystal, one methodology to improve slow light properties are proposed to support large NDBP at any group index in a photonic crystal line defect waveguide. Firstly, the effects of first and second row holes reflective indies n 1 and n 2 has been discussed, respectively. Then, one of the structural parameters, radius of holes in the first row r 1 , has been adjusted to extend the range of group index with large NDBP. By properly adjusting various combinations of n 1 and r 1 , the value of NDBP higher than 0.319 can be obtained at group index from 50 to 200. The design has shown the feasibility of post-fabrication technology to generate high performance slow light at any group index.