Dispersive Media Subcell Averaging in the FDTD Method Using Corrective Surface Currents

Author

Hamm, Jihun ; Renn, Fabian ; Hess, Ortwin

Author_Institution

Phys., Imperial Coll. London, London, UK

Volume

62

Issue

2

fYear

2014

fDate

Feb. 2014

Firstpage

832

Lastpage

838

Abstract

We present a corrective subcell averaging technique that improves on the accuracy of the volume-averaged finite-difference time-domain (FDTD) method in the presence of dispersive material interfaces. The method is based on an alternative effective-medium formulation that captures field discontinuities at interfaces as electric and magnetic surface currents. In calculating the spectra of strongly dispersive Mie scatterers we demonstrate that the derived FDTD algorithm is both highly efficient and able to approximately restore second order accuracy.

Keywords

Mie scattering; electric fields; finite difference time-domain analysis; magnetic fields; FDTD method; corrective surface current; dispersive material interface; dispersive media subcell averaging; effective-medium formulation; electric surface current; field discontinuity; magnetic surface current; strongly dispersive Mie scatterer; volume averaged finite difference time-domain method; Dispersion; Equations; Finite difference methods; Mathematical model; Permittivity; Standards; Time-domain analysis; Algorithms; FDTD methods; electromagnetic propagation in dispersive media;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2013.2292073

Filename

6671411