中文说明： 本程序在matlab中用时域有限差分法计算光子晶体的能带结构,并附带有在matlab下画的图,程序用matlab编写,感觉很有用。文件解压后能看到程序的m文件，在Matlab可以输入参数后直接运行结果，并且在程序中给出带隙分布图形。
English Description：
This program uses the finite difference time domain method to calculate the photonic crystal band structure in MATLAB, and attached with the diagram drawn in MATLAB, the program is written in MATLAB, feel very useful. After decompressing the file, we can see the m file of the program. After inputting parameters in MATLAB, we can directly run the results, and give the band gap distribution graph in the program.