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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(PQCs)的带隙特性进行了研究,分别讨论了介质柱形状和对称度变化对带隙宽度、带隙对方向不敏感特性的影响。数值模拟和分析结果表明,当填充因子保持不变时,介质柱形状不会影响带隙对方向不敏感的特性;六边形、正方形和三角形介质柱构成的准晶光子晶体的带隙宽度分别是圆形介质柱带隙宽度的98.9%,97.8%和91.5%,带隙宽度随着介质柱对称程度的降低逐渐变窄,但变化可以忽略;带隙宽度随介质柱的椭圆率,即对称度的降低而变窄,但变化趋势平缓,即使椭圆率小至0.3,相对带隙仍然有5.9%。这些分析结果表明,8重准晶光子晶体的带隙对加工误差所引起的形状变形和轴长偏离都具有较高的稳定性。
The bandgap characteristics of 8-p-quasicrystal photonic crystals (PQCs) composed of dielectric columns were investigated by FDTD. The effect of the shape and symmetry of dielectric column on the bandgap width, The impact of insensitive properties. The results of numerical simulation and analysis show that the shape of the dielectric column does not affect the band gap’s direction-insensitive properties when the fill factor remains unchanged. The bandgap widths of quasicrystalline photonic crystals composed of hexagonal, square and triangular dielectric columns are respectively Is 98.9%, 97.8% and 91.5% of the band gap width of the circular dielectric column. The band gap width narrows with the decrease of the symmetry of the dielectric column, but the variation is negligible. The band gap width varies with the ellipticity of the dielectric column, The degree of decrease narrowed, but the trend of change was gentle, even if the ellipticity was as small as 0.3, the relative band gap was still 5.9%. The results of these analyzes show that the bandgap of the 8-nlycrystal photonic crystal has a high stability to the shape deformation and the axial length deviation caused by machining errors.