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代码说明：

说明：  基于平面波展开 传输矩阵计算2维矩形光子晶体模型 计算可得出相关图谱 handbook中除了参数说明还有参考文献等(Plane wave expansion based on the transfer matrix calculation of 2-D model calculation of rectangular photonic crystal patterns can be drawn from the relevant handbook of parameters except that there are references such as)