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.
© 2012 Optical Society of America
Diffraction and Gratings
Original Manuscript: November 8, 2011
Revised Manuscript: February 12, 2012
Manuscript Accepted: February 14, 2012
Published: May 17, 2012
A. Roberts and L. Lin, "Plasmonic quarter-wave plate," Opt. Lett. 37, 1820-1822 (2012)