Modeling High Dielectric Material in the High-Order FDTD Using Exponential Time Differencing Algorithm

Ahstract-A high-order (HO) finite-difference time-domain (FDTD) method with exponential time differencing (ETD) algorithm is proposed to model electromagnetic wave propagation in dispersive material with high dielectric constant in this paper. The proposed method introduces an auxiliary difference equation (ADE) technique which establishes the relationship between the electric displacement vector and electric field intensity with a differential equation in high dielectric dispersive media. The ETD algorithm applies to the displacement vector and auxiliary difference variable in time domain and the fourth-order central-difference discretization is used in space domain. One example with plane wave propagation in a high dielectric dispersive media is calculated. Compared with the conventional ETD-FDTD method, the results from our proposed method show its accuracy and efficiency for high dielectric dispersive media simulation.