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    Extraordinary transmission has been recently measured in a parallel plate waveguide (PPWG) through a metal strip with a patterned 1-D periodic array of circular holes, the metal strip being embedded inside the PPWG. Wood's anomaly and the extraordinary transmission peak (EOT) were detected for transverse electric (TE) mode excitation at frequencies higher than those found for TEM mode excitation. In this paper we provide an explanation for this frequency shift by decomposing the problem of a TE mode impinging on the 1-D array of holes into two problems of plane waves impinging obliquely on 2-D periodic arrays of holes. By then solving the integral equation for the electric field on the surface of the holes, the origin of the frequency shift is proved both mathematically and physically in terms of the symmetries present in the system.


    Miguel Camacho, Rafael R Boix, Francisco Medina, Alastair P Hibbins, J Roy Sambles. On the extraordinary optical transmission in parallel plate waveguides for non-TEM modes. Optics express. 2017 Oct 02;25(20):24670-24677

    PMID: 29041412

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