有旋转六角洞的光子晶体的最大绝对带隙和缺陷模(英文)

Maximum absolute bandgap and defect modes in photonic crystals with rotated hexagonal holes

研究有旋转六角洞的三角点阵二维光子晶体的带结构 ,探索单元核几何对称性减少对绝对带隙值和局域缺陷模频率值的影响。对洞的中等旋转角 ,我们揭示此结构的最大绝对带隙可以获得 ,且该角依赖于洞的半径和背景材料的折射指数。我们也研究了由洞的缺失产生的缺陷模的特点 ,讨论了此结构模的可调性。

We study the bandgap structure of two-dimensional photonic crystals created by a triangular lattice of rotated hexagonal holes, and explore the effects of the reduced symmetry in the unit-cell geometry on the value of the absolute bandgap and the frequencies of localized defect modes. We reveal that a maximum absolute bandgap for this structure is achieved for an intermediate rotation angle of the holes. This angle depends on the radius of the holes and the refractive index of the background material. We also study the properties of the defect modes created by missing holes, and discuss the mode tunability in such structures.