Title :
Accurate modelling of the optical properties of left-handed media using a finite-difference time-domain method
Author :
Zhao, Yan ; Hao, Yang
Author_Institution :
Queen Mary Univ. of London, London
Abstract :
We have demonstrated that the conventional FDTD method for modelling of LHM leads to inaccurate description of high-order evanescent waves and does not simulate subwavelength imaging correctly. The simulations suffer from the artefact of ´numerical surface plasmons´ which appear at the interfaces of LHM. In order to solve this problem and ensure accurate FDTD modelling, a spatial averaging scheme at the boundaries has been proposed. This technique has been tested on the analytically solvable example of a plane wave propagation through an infinite LHM slab and extremely good accuracy of simulation has been revealed for all angles of incidence including high-order evanescent waves. The simulations of finite- sized slabs of LHM demonstrate that there are no restrictions on the functionality of LHM lenses due to their finite transverse dimensions.
Keywords :
finite difference time-domain analysis; metamaterials; optical properties; surface plasmons; artefact; finite transverse dimensions; finite-difference time-domain method; high-order evanescent waves; left-handed media; numerical surface plasmons; optical properties; plane wave propagation; spatial averaging scheme; Boundary conditions; Dielectric materials; Electrodynamics; Finite difference methods; Frequency; Perfectly matched layers; Permeability; Permittivity; Slabs; Time domain analysis;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2007 IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-0877-1
Electronic_ISBN :
978-1-4244-0878-8
DOI :
10.1109/APS.2007.4396136
