Metamaterial tunnel barrier gives broadband microwave transmission

A simple structure comprising a metal mesh, symmetrically surrounded by subwavelength thickness dielectric layers, is shown to give near total microwave transmission over a broad frequency range. The mesh may be considered to be a tunnel barrier since it behaves as an ideal plasmonic metamaterial wi...

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Bibliographic Details
Published in:Journal of applied physics 2011-01, Vol.109 (1), p.013104-013104-4
Main Authors: Butler, Celia A. M., Hooper, Ian R., Hibbins, Alastair P., Sambles, J. Roy, Hobson, Peter A.
Format: Article
Language:English
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Summary:A simple structure comprising a metal mesh, symmetrically surrounded by subwavelength thickness dielectric layers, is shown to give near total microwave transmission over a broad frequency range. The mesh may be considered to be a tunnel barrier since it behaves as an ideal plasmonic metamaterial with a negative effective permittivity and no loss. The introduction of the mesh into the dielectric cavity imposes a finite gradient on the electromagnetic fields at the two mesh-dielectric interfaces. This defines a finite wavelength of the zeroth order Fabry-Pérot-type mode, which would otherwise be infinite. Suitable choice of the mesh parameters yields a broad band of near total transmission associated with the overlap of this zeroth order mode with that of the first order half-wavelength Fabry-Pérot-type resonance.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3525557