论文部分内容阅读
提出了在完整三角晶格光子晶体中引入两线缺陷构成的耦合型波导结构。通过分析谱带形对不同结构参数的依赖关系,在最优化的光子晶体耦合波导中,找到了一种独特的、群速近似为零的谱带。通过对波导宽度的啁啾实现了不同频率光的色散补偿,最终得到了带宽为13.24nm、平均群折射率为28的宽带理想慢光,并进一步采用二维时域有限差分(FDTD)算法进行了验证。数值分析结果表明,高斯脉冲在耦合波导中传输后的相对时域展宽低于10%。
A coupled waveguide structure with two-wire defects introduced into complete triangular lattice photonic crystal is proposed. By analyzing the dependency of spectral bands on different structural parameters, a unique cluster velocity near zero is found in the optimized photonic crystal waveguide. By chirping the waveguide width, the dispersion compensation of light with different frequencies is achieved. The broadband ideal slow light with a bandwidth of 13.24 nm and an average group refractive index of 28 is finally obtained and further processed by a two-dimensional finite difference time-domain (FDTD) algorithm Verified. The numerical results show that the relative time domain broadening of Gaussian pulse after transmission in the coupled waveguide is less than 10%.