Rectangle Lattice Photonic Crystal with Large Absolute Band Gap at Low Frequency;
在低頻區(qū)具有大帶隙的長(zhǎng)方晶格二維光子晶體
The rectangle lattice 2D photonic crystal is formed by rectangle grid of dielectric veins and discrete square dielectric rods.
將呈網(wǎng)帶連通的長(zhǎng)方網(wǎng)格與呈離散狀態(tài)的正方介質(zhì)柱組合構(gòu)成長(zhǎng)方晶格光子晶體, 用快速平面波展開(kāi)法計(jì)算其能帶結(jié)構(gòu), 通過(guò)參數(shù)優(yōu)化, 在低頻區(qū)找到最大絕對(duì)禁帶寬度Δω=0 105 6ωe(ωe=2πc/a, a為晶格常數(shù), c為光速), 絕對(duì)禁帶中心頻率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.
利用快速平面波展開(kāi)法研究了兩種長(zhǎng)方晶格光子晶體,發(fā)現(xiàn)它們?cè)诟哳l區(qū)都存在大帶隙,經(jīng)參數(shù)優(yōu)化,原胞結(jié)構(gòu)為“工”字形的光子晶體,最大絕對(duì)禁帶寬度Δω為0。