Bilinear Transform Implementation of the Higher-Order PML

Based on stretched coordinates perfectly matched layer (SC-PML) formulations and bilinear transform technique, an efficient implementation of higher- order PML is proposed for finite difference time domain (FDTD) method. This higher-order PML can incorporate the advantages of the conventional PML and the convolution PML (CPML). Numerical results show that the proposed implementation of the higher- order PML can absorb both the propagating waves and the evanescent waves effectively, and has an improved absorbing performance over both the conventional PML and the CPML when requiring similar memory space.