title: Wideband plasmonic beam steering in metal gratings.
abstract: 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.
authors.affiliation: AEgis Technologies, Inc., Huntsville, Alabama 35806, USA. ddeceglia@aegistg.com
authors.forename: Domenico
authors.initials: D
authors.lastname: de Ceglia
authors.forename: Maria Antonietta
authors.initials: MA
authors.lastname: Vincenti
authors.forename: Michael
authors.initials: M
authors.lastname: Scalora