二维光子晶体线缺陷结构的光谱辐射特性

Spectral Radiative Characteristics of Two-Dimensional Photonic Crystal With Line-Defect

光子晶体的禁带特性是该新兴材料的最根本特征。本文运用平面波展开法(PWE)计算了一种正方晶格Si光子晶体材料的禁带特性,并基于该材料设计出一种红外波段的线缺陷光子晶体波导结构。运用时域有限差分法(FDTD)研究了线缺陷二维光子晶体波导宽度对通频带、电场强度及透射能量的影响,研究结果为二维光子晶体波导器件的开发和利用提供了理论支撑。

As a kind of novel optical material, photonic band gap （PBG） is the fundamental characteristic of photonic crystal. In this paper, photonic band gap distribution of a rectangularlattice Si photonic crystal was calculated using the plane wave expansion method （PWE）. Based on this PBG structure, we designed a kind of line-defect photonic crystal waveguide structure for infrared application, and analyzed the influence of line-defect waveguide width towards passband, electric field intensity and transmission characteristic using the finite-difference time-domain method （FDTD）. After band structure analysis, it is feasible to fabricate this two-dimensional photonic crystal waveguide device.