中文说明：利用时域有限差分（FDTD）仿真三维（3D）电磁波的传播，吸收边界条件为完全匹配层（PML）。
English Description：
Finite difference time domain (FDTD) is used to simulate the propagation of three-dimensional (3D) electromagnetic waves with perfectly matched layer (PML) as absorbing boundary condition.