Title :
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
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;
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
DOI :
10.1109/IWAT.2007.370180
