Novel implementation of the CFS-PML and its validation for dispersive media

A novel and efficient implementation of the complex frequency shifted perfectly matched layer (CFS-PML) based on the stretched coordinate PML (SC-PML) formulations is proposed for truncating the finite-difference time-domain (FDTD) lattices. For terminating dispersive media, the piecewise-linear recursive convolution (PLRC) is incorporated into the FDTD update scheme. To validate the proposed formulations, a three-dimensional (3D) dispersive half-space problem is simulated. It is shown in the numerical test that the proposed formulations with CFS scheme are efficient in attenuating of low frequency and evanescent waves and reducing late-time reflections.