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Mechanism of the metallic metamaterials coupled to the gain material

TitleMechanism of the metallic metamaterials coupled to the gain material
Publication TypeJournal Article
Year of Publication2014
AuthorsHuang, ZX, Droulias, S, Koschny, T, Soukoulis, CM
JournalOptics Express
Date Published11
Type of ArticleArticle
ISBN Number1094-4087
Accession NumberWOS:000345268500082

We present evidence of strong coupling between the gain material and the metallic metamaterials. It is of vital importance to understand the mechanism of the coupling of metamaterials with the gain medium. Using a four-level gain system, the numerical pump-probe experiments are performed in several configurations (split-ring resonators (SRRs), inverse SRRs and fishnets) of metamaterials, demonstrating reduction of the resonator damping in all cases and hence the possibility for loss compensation. We find that the differential transmittance Delta T/T can be negative in different SRR configurations, such as SRRs on the top of the gain substrate, gain in the SRR gap and gain covering the SRR structure, while in the fishnet metamaterial with gain Delta T/T is positive. (C) 2014 Optical Society of America

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