一维成像FDTD,TM电磁波各处场强的数值，完全匹配成PML内参数的设置。-A d imaging FDTD, TM electromagnetic wave field numerical everywhere, fit into PML parameter set in

This code shows in a simple way the implementation of 2 dimention finite difference time domain simulation. We also implement perfectly match layer at the border.,This code shows in a simple way the implementation of 2 dimention finite difference tim

二维FDTD模拟，中间加入正弦波，四周有PML边界吸收，为TM波-2D FDTD simulation, the middle sine wave, surrounded by PML absorbing boundary for TM wave