多通道可调谐1.55μm光子晶体滤波器

Multi-channel tunable 1.55 μm filter based on photonic crystal

建立了(AB)N型一维光子晶体结构多通道可调谐滤波器模型,其中A层是砷化镓(GaAs)材料,B层是由掺铝的氧化锌层和氧化锌层(AZO/ZnO)交替排列构成的具有人工周期结构的各项异性材料。根据电磁波的传输矩阵理论,推导了光子晶体的透射率公式。数值模拟表明:此结构光子晶体透射中心波长是1.55μm,对应于光子通带;透射峰的数量由光子晶体的周期N决定;B层中填充因子h从2/3增加到11/12,峰值波长蓝移且移动范围超过200 nm;A和B层厚度增加,透射峰中心波长发生红移;而入射角度的增加将使透射峰中心波长蓝移;在各参数的调控范围内,光子晶体均保持较高的透射率不变。这些现象为光通信波段多通道可调谐高性能滤波器的设计提供了理论参考。

A filter model with one-dimensional photonic crystal structure （AB）N was proposed. Layer A was gallium arsenide （GaAs） material and layer B was an artificial periodic structure material. B was anisotropic and made of aluminum-doped zinc oxide and zinc oxide （AZO/ZnO） alternately. Based on the theory of electromagnetic wave transmission matrix, the transmission rate of photonic crystal was derived. The numerical simulation shows that the center wavelength of the transmission is 1.55μm and corresponds to the photon pass band, The number of transmission peaks was determined by the period N of the photonic crystal. Increasing the filling factor h of the B layer from 2/3 to 11/12, the transmission peak wavelength was blue shifted and the moving range exceeds 200 nm. Increasing the thickness of the A and B layers, the peak wavelength was red shifted. When the incidence angle increases, the peak wavelength was blue shifted. The photon crystal will maintain a high transmittance within the control range of each parameter. These phenomena provide a theoretical reference for the design of multi- channel tunable high performance filter for optical communication.