一类高品质因子大透过率二维光子晶体微腔

Two-dimensional photonic crystal microcavities with high quality factor and large transmission

利用多重散射法数值模拟了多个具有五个缺陷点的氧化铝介质柱四方晶格二维光子晶体微腔的透过率T和品质因子Q.结果表明,沿x、y方向介质柱的个数Lx、Ly以及介质柱半径r对微腔品质因子和透过率均有明显影响.通过优化参数,实现了一类具有大透过率T、高品质因子Q的微腔.在模拟范围内,当Lx=13、Ly=17和r=0.25时,微腔品质因子和透过率同时达到较大值,分别为49 270和91%.

The quality factor Q and transmission T of two-dimensional photonic crystal microcavities,which consist of square arrays of Al2O3 rods with 5 lattice defects,were simulated by the multiple-scattering computation method.The simulation results show that the quality factor Q and the transmission T are greatly affected by the numbers of dielectric rods Lx,Ly and the radius of dielectric rods.Two-dimensional mircrocavities with high Q and large T are realized through optimizing the structure parameters.In this simulation case, when Lx = 13, Ly = 17, and r = 0.25, the quality factor and the transmission are optimized as 49270 and 91%, respectively.