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Theory of fishnet negative-index optical metamaterials

Jianji Yang 1 Christophe Sauvan 2, 1 Haitao Liu 3 Philippe Lalanne 1, 2
1 Laboratoire Charles Fabry de l'Institut d'Optique / Naphel
LCFIO - Laboratoire Charles Fabry de l'Institut d'Optique
2 lp2n-03,lp2n-13
LP2N - Laboratoire Photonique, Numérique et Nanosciences
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.
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Jianji Yang, Christophe Sauvan, Haitao Liu, Philippe Lalanne. Theory of fishnet negative-index optical metamaterials. Physical Review Letters, American Physical Society, 2011, 107, pp.043903. ⟨10.1103/PhysRevLett.107.043903⟩. ⟨hal-00681497⟩



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