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研究了具有线状缺陷的三角晶格光子晶体波导中慢光的传播特性,设计了一种新的具有低群速度低色散的波导结构,并对其进行了数值模拟分析.通过增大光子晶体的空气柱半径及改变与波导相邻的第一排和第二排空气柱位置,可在一定的归一化带宽范围内保持较大群折射率的同时使群速度色散最小化,实现在一定波长范围内保持低群速度和低群速度色散,得到了较大的群折射率和归一化带宽的乘积.计算结果表明:当群折射率依次为85,58,45时,对应的归一化带宽分别为0.32%,0.48%,0.642%.
The propagation characteristics of slow light in a triangular lattice photonic crystal waveguide with linear defects were studied. A new waveguide structure with low group velocity and low dispersion was designed and analyzed by numerical simulation. By increasing the photonic crystal And to change the positions of the first row and the second row of air columns adjacent to the waveguide, the group velocity dispersion can be minimized while maintaining the larger group refractive index within a certain range of normalized bandwidth, and the wavelength dispersion can be achieved at a certain wavelength The low group velocity and the low group velocity dispersion are kept in the range, and the product of the larger group refractive index and the normalized bandwidth is obtained. The calculation results show that when the group refractive indices are 85, 58 and 45, respectively, the corresponding normalization Bandwidth was 0.32%, 0.48%, 0.642% respectively.