三维有限差分时域方法的代码。可以计算电介质，色散介质（drude 模型）等的光学响应。三维光子晶体结构的能带等。-Code domain finite difference method when. You can calculate the dielectric dispersion medium (drude model) and other optical response. And other three-dimensional

能够计算不同排列情况下的能带结构，只需更给晶格常数，选择排列方式以及介电常数即可(It is possible to calculate the energy band structure under different arrangement conditions, only by giving lattice constants, arranging permutations and permittivity.)