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Keywords:

  • Diffraction gratings;
  • light transmission;
  • metallic thin films;
  • nanostructured materials

Summary

The spectral response of metallic two-dimensional periodic structures in which circular apertures are engraved has been extensively studied. We show that in such devices transmission can be highly enhanced by partially shutting the central parts of each aperture in order to make a periodic array of subwavelength coaxial structures.