A two-dimensional photonic crystal with six large bandgaps formed by a hexagonal lattice of anisotropic cylinders

• 来源期刊: 中国物理（英文版）
• 学科: 物理学
• 关键词: complete bandgap hexagonal structure symmetry stability
• 年，卷（期）: 2002,（8）
• 页码范围: 834-838
• 页数: 5页
• 分类号: O4
• 语种: 英文

摘要

The plane-wave expansion method is used to calculate the band structure of a two-dimensional photonic crystalformed by a hexagonal structure of anisotropic cylinders. Two cylindrical inclusions in the unit cell have two differentradii, R1 and R2 (Ri＜R2). By reducing the symmetry of the structure and choosing appropriately parameters R2and s = R1/R2 (s＜1), we obtain six large complete bandgaps, among which three are over 0.05 ωe (where ωe = 2πc/a)in the high region of the normalized frequency (however, one of these over 0.065 ωe is not stable). There are two otherstable complete bandgaps in the low-frequency region.