Full-wave parallel dispersive finite-difference time-domain modeling of three-dimensional electromagnetic cloaking structures

TL;DR

This paper introduces a parallel dispersive FDTD method for accurately modeling 3D electromagnetic cloaking structures, accounting for material dispersion and ensuring stable, convergent simulations with realistic wave effects.

Contribution

It presents a novel parallel dispersive FDTD approach incorporating Drude model dispersion and ADE method for 3D cloaks, improving simulation stability and accuracy.

Findings

Waves experience delay and pulse broadening when passing through the cloak.

Simulation results show blue-shift effects in the cloaking structure.

Stable, wideband simulations validate the method's effectiveness.

Abstract

A parallel dispersive finite-difference time-domain (FDTD) method for the modeling of three-dimensional (3-D) electromagnetic cloaking structures is presented in this paper. The permittivity and permeability of the cloak are mapped to the Drude dispersion model and taken into account in FDTD simulations using an auxiliary differential equation (ADE) method. It is shown that the correction of numerical material parameters and the slow switching-on of source are necessary to ensure stable and convergent single-frequency simulations. Numerical results from wideband simulations demonstrate that waves passing through a three-dimensional cloak experience considerable delay comparing with the free space propagations, as well as pulse broadening and blue-shift effects.