采用时域有限差分法模拟了电磁波在一维空间传播的情况，其中电磁波为平面波，激励源为正弦波，程序中没有加入吸收边界条件(The finite-difference time-domain method is used to simulate the propagation of electromagnetic waves in one-dimensional space. The electromagnetic wave is a plane wave, the excitation source is a sine wave, and no absorbing boundary condition is added to the program.)