等离子体填充二维金属光子晶体色散特性研究

摘要

提出了等离子体填充的二维金属光子晶体模型,采用时域有限差分法研究了等离子体填充的二维正方品格和三角晶格金属光子晶体的色散和带隙特性.对比分析了两种结构中等离子体密度对TM及TE模式传播特性的影响规律.研究发现,由于背景等离子体的引入,二维金属光子晶体的色散曲线明显往高频方向移动,等离子体密度的改变可同时控制TE和TM模的带隙位置和禁带宽度.这些特性使得二维等离子体金属光子晶体在设计可调谐光子晶体器件方面具有潜在的应用价值.%Dispersion characteristics of square and triangular metallic photonic crystals filling with plasma are investigated by finite difference time domain( FDTD) method. Effects on TM and TE modes in the two-structures with the variation of plasma density are analyzed.Trie results show thai the dispersion curves of 2-D metallic photonic crystal filling with plasma upshift to the higher frequency . The width and location of bandgap of TM and TE modes can be controlled by the density of plasma. These properties of the 2-D Metallic Photonic crystal with background are potentially valuable in the aspect of designing tunable photonic crystal device.