A mirror structure that enables the polarization of linearly polarized light to be rotated by 90° over the entire visible region of the spectrum is presented. Theoretical modeling is used to show that this phenomenon occurs for light that is normally incident upon a metal grating consisting of a series of high and narrow ridges that are oriented at 45° to the polarization angle. This broad polarization-conversion band is shown to arise from mode mixing of surface plasmon polariton-mediated polarization-conversion bands and interference-mediated polarization-conversion bands.
© 2002 Optical Society of America
(050.1950) Diffraction and gratings : Diffraction gratings
(240.6680) Optics at surfaces : Surface plasmons
(240.6690) Optics at surfaces : Surface waves
(260.5430) Physical optics : Polarization
I. R. Hooper and J. R. Sambles, "Broadband polarization-converting mirror for the visible region of the spectrum," Opt. Lett. 27, 2152-2154 (2002)