New Journal of Physics (Jan 2013)

Hedgehog subwavelength hole arrays: control over the THz enhanced transmission

  • M Navarro-Cía,
  • Pablo Rodriguez-Ulibarri,
  • M Beruete

DOI
https://doi.org/10.1088/1367-2630/15/1/013003
Journal volume & issue
Vol. 15, no. 1
p. 013003

Abstract

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By backing or sandwiching a holey metal layer with or between isotropic dielectric slabs, additional peaks of transmission within the long-wavelength regime arise as a result of the induced transverse magnetic (TM) or transverse electric (TE) grounded dielectric modes. A similar control of the complex surface wave modes, and thus of the extraordinary transmission (ET) peaks, is demonstrated here via anisotropic slabs in the form of a fakir's bed of nails. However, it is shown that those ET peaks formed from TE modes are suppressed because of the inherent dispersion characteristics of the free-standing grounded pins. This allows the red-shifting of the ET for the polarization parallel to the larger in-plane period of the hole array, but unlike the dielectric isotropic slab configuration, the orthogonal polarization remains inhibited.