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采用时域有限差分(finite-difference time-domain,FDTD)方法计算正方和六角排列圆形光子晶体的能带结构,研究了光子晶体占空比对能带的影响,找到一组获得带隙个数最多的二维光子晶体的几何结构参数;采用FDTD方法计算具有该参数的光子晶体的发光二极管(LED)出光效率,模拟表明该结构参数的正方和六角排列圆形光子晶体提高了GaN基蓝光LED出光效率5—6倍,六角排列优于正方排列;利用禁带理论、等效介质理论分析了增透机理.
The energy band structure of a square and a hexagonal arrangement of circular photonic crystals was calculated by the finite-difference time-domain (FDTD) method. The effect of photonic crystal duty cycle on the energy band was studied. And the geometrical parameters of the two-dimensional photonic crystal with the largest number are calculated. The light-emitting efficiency (LED) of the photonic crystal with this parameter is calculated by using the FDTD method. Simulation shows that the square and hexagonal arrangement of the photonic crystal in the structure improves the GaN- LED 5-6 times the light efficiency, hexagonal arrangement is better than the square arrangement; the use of the band gap theory, equivalent medium theory analysis of the anti-penetration mechanism.