Abstract : We theoretically study fishnet metamaterials at optical frequencies. In contrast with earlier works, we provide a microscopic description by tracking the transversal and longitudinal flows of energy through the fishnet mesh composed of intersecting subwavelength plasmonic waveguides. The analysis is supported by a semianalytical model based on surface-plasmon coupled-mode equations, which provides accurate formulas for the fishnet refractive index, including the real-negative and imaginary parts. The model simply explains how the surface plasmons couple at the waveguide intersections, and it shines new light on the fishnet negative-index paradigm at optical frequencies. Extension of the theory for losscompensated metamaterials with gain media is also presented.
https://hal-iogs.archives-ouvertes.fr/hal-00681497
Contributeur : Christophe Sauvan
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Soumis le : mardi 1 décembre 2015 - 16:15:24
Dernière modification le : jeudi 1 février 2018 - 15:42:04
Document(s) archivé(s) le : mercredi 2 mars 2016 - 15:11:01
