title: Spatial optical beam steerin with an AlGaAs integrated phased array.
abstract: A passive spatial light beam deflector based on a channel waveguide phased-array concept is presented. Diffraction gratings patterned by electron-beam lithography couple light into and out of the device. Phasing is achieved electro-optically with indium tin oxide/AlGaAs Shottky junctions. Discrete beam steering is first demonstrated with a 43-element rib waveguide array at an 850-nm wavelength. A sawtooth electrode keeps the device length short and the electrode surface small. Continuous deflection over a ±7.2 mrad range at a 900-nm wavelength is then reported. A set of seven sawtooth and offset electrodes permits addressing any point within this range. The beam has a width of 1.5 mrad, and the maximum modulation voltage is -8.5 V.
authors.forename: F
authors.initials: F
authors.lastname: Vasey
authors.forename: F K
authors.initials: FK
authors.lastname: Reinhart
authors.forename: R
authors.initials: R
authors.lastname: Houdré
authors.forename: J M
authors.initials: JM
authors.lastname: Stauffer