Extension of FLOD-FDTD Method for Multiterm Modified Lorentz Model

The numerical superiority of the unconditionally stable fundamental locally one-dimensional finite-difference time-domain (FLOD-FDTD) method has been proved in some studies. In this article, the FLOD-FDTD method is extended to simulate general dispersive media in combination with the auxiliary differential equation (ADE) scheme with formulation based on the electric field (
${E}$
) and electric polarization (
${P}$
). The relative permittivity of dispersive media is described by the arbitrary multi-term modified Lorentz model which can also represent Debye and Drude models. Thus, this method is able to include different types of dispersion in a unified formulation. The correctness and efficiency of the proposed method are demonstrated by some numerical cases.