,Reduction of Refractive Index Contrast Threshold for Photonic Band-Gap in Square Lattices

• 作 者: WANG Jian-Feng HUANG Yi-Dong ZHANG Wei PENG Jiang-De
• 机 构: Department of Electronics Engineering, Tsinghua University, Beijing 100084
• 出 处: 中国物理快报（英文版）
• 发表日期: 2005年12期

The threshold of refractive index contrast (RIC) to open a photonic band gap can be reduced by symmetry breaking. For the case of square lattice composed by dielectric cylinders, the absolute band gap is demonstrated by inserting small rods in the centre of the lattices, and the threshold RIC is reduced to 3.8. As for the square lattices composed by air holes in dielectric, the minimal RIC required for an absolute band gap decreases to 2.20.