正方排列芯壳型平板光子晶体禁带特性的研究

The investigation on photonic band-gap in square core-shell type photonic crystal slabs

构建了正方排列的芯壳型平板光子晶体结构,发现这种芯壳型平板光子晶体较传统的介质柱型平板光子晶体能获得更宽的类TE禁带.分析了两种模型,一种是芯层折射率为3.5,壳层折射率为2;另一种是芯层折射率为2,壳层折射率为3.5,发现当芯层折射率大于壳层折射率时,光子禁带明显增宽.

A core-shell type photonic crystal slab with a square lattice is studied.The results present that the core-shell type photonic crystal slab can obtain wider TE band gaps than the traditional photonic crystal slab with rods in air.Two models have been analyzed.One is that the refractive index of the core is 3.5,and the refractive index of the shell is 2.The other is that the refractive index of the core is 2,and the refractive index of the shell is 3.5.The study reveals that the photonic band gap is considerably enhanced in size when the refractive index of the core is larger than the shell.