Metamaterial tunnel barrier gives broad band microwave transmission
Butler, Celia A.M.
Hooper, Ian R.
Hibbins, Alastair P.
Sambles, J. Roy
Journal of Applied Physics
American Institute of Physics
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
Engineering and Physical Sciences Research Council (EPSRC)
© 2011 American Institute of Physics
Vol. 109 (1), article 013104
Industrial CASE scheme (no. 08000346)