We investigate transmission of a normally incident, linearly polarized plane wave through a circular sub-wavelength hole in a metal film filled by a high index dielectric medium. We demonstrate for the first time that the transmission efficiency of such holes exhibits a Fabry-Pérot-like behaviour versus thickness of the metal film, similar to that exhibited by sub-wavelength slits in metal films illuminated by TM-polarized plane waves. We show that by reducing the imaginary part of the propagation constant of the hybrid HE11 mode and by fortifying the Fabry-Pérot resonance, the high index dielectric filling can greatly enhance light transmission through a circular sub-wavelength hole.
|Pages (from-to)||6980 - 6989|
|Number of pages||10|
|Publication status||Published - 2005|
|MoE publication type||A1 Journal article-refereed|