A unified 3-D simulating framework for Debye-type dispersive media and PML technique based on recursive integral method

A novel implementation of the Debye dispersive model with the recursive integration (RI) approach is proposed for the finite-difference time-domain (FDTD) method simulation. The RI method also demonstrates good compatibility with the traditional FDTD framework, particularly for efficiently constructing the perfect matched layer (PML) technique. Therefore, a crucial feature of the proposed simulation framwork is its unified formulation for constrcuting the lossy Debye dispersive media and the PML technique. Meanwhile, the von Neuman method combined with the Routh-Hurwitz criterion is employed to analyze the stability of the introduced method, which provides a systematic analysis method for determining the CFL limitation of the FDTD method in solving the dispersive model. The numerical results further confirm the accuracy and efficiency of the RI method for simultaneously simulating Debye dispersive media and setting RI-PML. (C) 2022 Elsevier B.V. All rights reserved.