利用有限元法，用comsol和matlab软件计算光子晶体三维带隙-With finite element method, using comsol and matlab software to compute three-dimensional photonic crystals band gap

Matlab链接Comsol程序，计算光纤模式，保存数据，优化参数(Matlab link Comsol program, calculating the modes of optical fiber, save data, optimize parameters)