Spatially Dispersive Finite-Difference Time-Domain Modelling of the Wire Medium for Subwavelength Imaging

Author

Zhao, Yan ; Belov, Pavel A. ; Hao, Yang

Author_Institution

Dept. of Electron. Eng., Queen Mary Univ. of London

fYear

2007

fDate

21-23 March 2007

Firstpage

487

Lastpage

490

Abstract

This paper presents the modelling of wire medium using a finite-difference time-domain (FDTD) method. The flat subwavelength lenses formed by the wire medium (lattices of parallel metallic wires) have been modelled in FDTD through the effect medium approach. The auxiliary differential equation (ADE) method has been applied in FDTD model in order to take into account both the frequency dispersion effect and the spatial dispersion effect which was found recently. The developed formulas have been implemented in a two-dimensional (2-D) FDTD model and validated by comparing transmission coefficient calculated from analytical solutions. The simulation results demonstrate the subwavelength imaging capability of the wire medium lenses.

Keywords

differential equations; dispersion (wave); electromagnetic wave transmission; finite difference time-domain analysis; wire antennas; wires; FDTD; auxiliary differential equation; frequency dispersion effect; parallel metallic wires; spatial dispersion effect; spatially dispersive finite-difference time-domain modelling; subwavelength imaging; wire medium; Dielectrics; Dispersion; Equations; Finite difference methods; Frequency; Lattices; Lenses; Permittivity; Time domain analysis; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on

Conference_Location

Cambridge

Print_ISBN

1-4244-1088-6

Electronic_ISBN

1-4244-1088-6

Type

conf

DOI

10.1109/IWAT.2007.370180

Filename

4227496