Rectangle Lattice Photonic Crystal with Large Absolute Band Gap at Low Frequency;
在低频区具有大带隙的长方晶格二维光子晶体
The rectangle lattice 2D photonic crystal is formed by rectangle grid of dielectric veins and discrete square dielectric rods.
将呈网带连通的长方网格与呈离散状态的正方介质柱组合构成长方晶格光子晶体, 用快速平面波展开法计算其能带结构, 通过参数优化, 在低频区找到最大绝对禁带宽度Δω=0 105 6ωe(ωe=2πc/a, a为晶格常数, c为光速), 绝对禁带中心频率ωc=0 903 8ωe,Δω/ωc=11 7%。
The modified plane-wave expansion method for calculating quickly the band structure is used to study the band structure in two rectangle lattice 2D photonic crystals.
利用快速平面波展开法研究了两种长方晶格光子晶体,发现它们在高频区都存在大带隙,经参数优化,原胞结构为“工”字形的光子晶体,最大绝对禁带宽度Δω为0。