Broadband blueshift tunable metamaterials and dual-band switches

TitleBroadband blueshift tunable metamaterials and dual-band switches
Publication TypeJournal Article
Year of Publication2009
AuthorsShen NH, Kafesaki M, Koschny T, Zhang L, Economou EN, Soukoulis CM
Journal TitlePhysical Review B
Volume79
Pages161102
Date Published04/01
ISBN Number1098-0121
Accession NumberISI:000265945200002
Keywordscapacitors, electro-optical modulation, electro-optical switches, frequencies, inductors, metamaterials, negative refractive-index, optical hyperlens, optical resonators, spectral line shift
Abstract

We propose a design and numerical study of an optically tunable metamaterial based on an electric-field-coupled inductor-capacitor resonator variant in the terahertz regime. In contrast to earlier proposed structures, we demonstrate that a blueshift of the resonance frequency under illumination can be accomplished with realistic material parameters and a broadband tuning range on the order of 40% has been demonstrated, which is found to be based on a photoconductivity-induced mode-switching effect. We also present a variant of this structure, which simultaneously possesses two resonance frequencies and can be used as an optically switchable dual-band resonator. Our all-optical modulators and switches may offer a step forward in filling the "THz gap.".

URL<Go to ISI>://000265945200002
DOI10.1103/Physrevb.79.161102