To obtain refractive index of -1 decreasing the incident light frequency and enlarging the waveguide width are both necessary.
要得到折射率为- 1的情况，则入射光归一化频率越小，光子晶体的波导宽度要相应越大。
When the frequency of the incident light lies around the Bragg frequency of the periodic dielectric, it will not be completely reflected as in the linear case.
频率处于周期介质布拉格频率附近的入射信号光，将不会像在线性周期介质中那样被完全反射。
The theoretical results confirmed the experimental results. It is shown that the light with a certain frequency and incident direct…
实验结果与计算结果一致表明：对于一定的入射方向，某些频率的光不能在光子晶体中传播。
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