Plasmonic quarter-wave plate.
Here we present a strategy for designing wave plates utilizing resonances of subwavelength apertures in metallic films. Specifically, we show that it is possible to tune the geometry in a periodic array of cross-shaped apertures in a silver film to produce a quarter-wave plate at a particular wavelength in the near-infrared. This is achieved by introducing an asymmetry into the lengths of the arms of the crosses.
School of Physics, University of Melbourne, Victoria, 3010, Australia. ann.roberts@unimelb.edu.au
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