本程序实现在计算电磁学中的三维时域有限差分法-This procedure to achieve in the calculation of three-dimensional electromagnetic finite difference time domain method

时域有限差分方法计算电磁波在二维真空中的传播特性，激励源为正弦波，PML边界-Finite difference time domain method to calculate the transmission characteristics of electromagnetic wave in 2 d vacuum, excitation source of sine wave, the PML boundary