We demonstrate controllable light deflection in thick metal gratings with periodic subwavelength slits filled with an active material. Under specific illumination conditions, the grating becomes nearly transparent and acts as a uniform optical phased-array antenna where the phase of the radiating elements is controlled by modifying the index of refraction of the material that fills each slit. The beam-steering operational regime occurs in a wide wavelength band, and it is relatively insensitive to the input angle.
© 2012 Optical Society of America
Diffraction and Gratings
Original Manuscript: September 15, 2011
Revised Manuscript: November 18, 2011
Manuscript Accepted: November 22, 2011
Published: January 13, 2012
Domenico de Ceglia, Maria Antonietta Vincenti, and Michael Scalora, "Wideband plasmonic beam steering in metal gratings," Opt. Lett. 37, 271-273 (2012)