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采用时域有限差分法(FDTD)对介质柱构成的8重准晶光子晶体(PQC)的光子带隙(PBG)特性进行了研究,分别讨论了介质柱尺寸无序和位置无序对其带隙宽度、位置和各向同性的影响.数值模拟结果表明,随着介质柱尺寸无序和位置无序的增大,8重准晶光子晶体带隙的中心频率向低频方向移动,带隙的相对宽度均变窄,但介质柱尺寸无序对带隙的影响远大于位置无序的影响.当尺寸无序达到介质柱半径的一半时,带隙完全消失,而对于相同大小的位置无序,相对带隙宽度只改变了1%;同时,在较大结构无序范围内,带隙的各向同性也能很好地保持.
Photonic bandgap (PBG) properties of 8-p-quasicrystal photonic crystal (PQC) composed of dielectric columns were studied by using FDTD method. The effects of disordered size and disordered positions on the bandgap Gap width, position and isotropy.Numerical simulation results show that the center frequency of the bandgap of 8 recrystallized photonic crystal shifts to the low frequency with the increase of disorder and disordered positions of the dielectric column, and the bandgap But the width of the column becomes narrower, but the effect of the column size disorder on the bandgap is far greater than that of the position disorder. When the size disorder reaches half the radius of the dielectric column, the band gap completely disappears and the position of the same size is out of order , The relative bandgap width has only changed by 1%; at the same time, the bandgap isotropy can also be well maintained within the larger disordered structure.