Enhanced optical transmission at the cutoff transition

Opt Express. 2009 Apr 27;17(9):6920-30. doi: 10.1364/oe.17.006920.

Abstract

The phenomenon of extraordinary transmission in the optical regime for circular hole arrays in optically thick metal films is studied as a function of hole size and depth. In the limit of small holes compared to the depth, the transmission properties follow a waveguide type behavior. By describing the transmission process as resulting from the interference between a resonant and a non-resonant contribution, a transition is clearly revealed through the specific spectral variations of the resonance at a given hole depth. This transition is associated to a change in the attenuation through the hole as its size increases, and corresponds to the optimal condition for surface plasmon excitation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Computer Simulation
  • Light
  • Models, Theoretical*
  • Refractometry / methods*
  • Scattering, Radiation
  • Surface Plasmon Resonance / methods*