Size dependence and convergence of the retrieval parameters of metamaterials

TitleSize dependence and convergence of the retrieval parameters of metamaterials
Publication TypeJournal Article
Year of Publication2008
AuthorsZhou JF, Koschny T, Kafesaki M, Soukoulis CM
Journal TitlePhotonics and Nanostructures-Fundamentals and Applications
Volume6
Pages96-101
Date PublishedApr
Type of ArticleProceedings Paper
ISBN Number1569-4410
Accession NumberISI:000255667700014
Keywordsfishnet structure, left handed material, negative index material, negative-index metamaterial, phase, retrieval parameter, VELOCITY, wavelengths
Abstract

We study the dependence of the retrieval parameters, such as the electric permittivity, epsilon, the magnetic permeability, mu, and the index of refraction, n, on the size of the unit cell of a periodic metamaterial. The convergence of the retrieved parameters on the number of the unit cells is also examined. We have concentrated our studies on the so-called fishnet structure, which is the most promising design to obtain negative n at optical wavelengths. We find that as the size of the unit cell decreases, the magnitude of the retrieved effective parameters increases. The convergence of the effective parameters of the fishnet as the number of the unit cells increases is demonstrated but found to be slower than for regular split ring resonators and wires structures. This is due to a much stronger coupling between the different unit cells in the fishnet structure. Published by Elsevier B.V.

DOI10.1016/j.photonics.2007.10.003
Alternate JournalPhotonics Nanostruct.