反蛋白石结构光子晶体材料中光传输的仿真研究

Simulation Study of Light Propagation in Inverse-opal Structured Photonic Crystal

单分散胶体球可自组装出面心立方结构(周期常数为a)的三维光子晶体材料,进一步用高折射率光学材料填充其间隙再除去胶体球则可制得高折射率差、反蛋白石结构的三维光子晶体材料,从而应用于集成光子器件。了解其光子带隙以及光在缺陷中的传输性质是设计与制造该光子晶体材料与器件的基础,因此采用时域有限差分法仿真,研究不同波长λ的光在完整与含直线、L形线缺陷的反蛋白石结构光子晶体材料中的传输性质。研究结果表明该材料光子禁带的归一化频率a/λ在0.45~0.55之间,光在直线缺陷和L形线缺陷中传输的透过系数分别为~65%和~72%。

Mono-dispersed colloidal spheres could be self-assembled into face-centered cubic(FCC,lattice period constant is a)structured three-dimensional photonic crystal materials,furthermore,the photonic crystal of colloidal spheres could be used as a template for filling in with high refractive index optical material,then remove the colloidal spheres to obtain inversed-Opal structured photonic crystal material with high refractive index difference for integrated optical devices.In the present work,in order to know the light propagation in this kind of material,simulation study with the finite difference time domain method(FDTD)was carried out to understand different wavelength light-beam propagations in this kind of photonic crystal,as well as in straight-line and L-shape line defects.Simulation results indicated that the band-gap region located between a/λ=0.45 to 0.55,and the transmission coefficients for light-beam in straight-line and L-shape line defects in this photonic crystal reached up to^65%and^72%,respectively.