Sinusoidal plane wave excitation method without solving 1D FDTD in 2D ID-FDTD scheme

In this paper, a plane wave excitation using an analytic expression of a plane wave is proposed for the 2D ID-FDTD scheme. In the proposed method, it is not required to solve 1D FDTD for calculation of an incident plane wave. In addition, no reflected wave from the 1D absorbing boundary exists. Hence, in the TF region, the resulting incident wave can be more close to the exact plane wave than that for the conventional method. Since a monochromatic wave can not be excited in any FDTD scheme, at the beginning of the wave propagation, error between the exact wave and wave simulated by FDTD method can exist. However, this error will decrease with increasing time.