Accurate Modelling of Left-Handed Metamaterials Using Finite-Difference Time-Domain Method with Spatial Averaging at the Boundaries

TL;DR

This paper enhances the accuracy of FDTD simulations for left-handed metamaterials by introducing an averaging technique at boundaries and correcting permittivity, enabling more precise modeling of dispersive properties.

Contribution

It presents a novel averaging method at boundaries and a corrected permittivity formulation for dispersive FDTD modeling of LHMs, improving simulation accuracy.

Findings

Averaging at boundaries improves modeling accuracy.

Corrected permittivity reduces parameter mismatch.

Optimal source switching time accelerates convergence.

Abstract

The accuracy of finite-difference time-domain (FDTD) modelling of left-handed metamaterials (LHMs) is dramatically improved by using an averaging technique along the boundaries of LHM slabs. The material frequency dispersion of LHMs is taken into account using auxiliary differential equation (ADE) based dispersive FDTD methods. The dispersive FDTD method with averaged permittivity along the material boundaries is implemented for a two-dimensional (2-D) transverse electric (TE) case. A mismatch between analytical and numerical material parameters (e.g. permittivity and permeability) introduced by the time discretisation in FDTD is demonstrated. The expression of numerical permittivity is formulated and it is suggested to use corrected permittivity in FDTD simulations in order to model LHM slabs with their desired parameters. The influence of switching time of source on the oscillation of field intensity is analysed. It is shown that there exists an optimum value which leads to fast convergence in simulations.