title: High-efficiency large-angle Pancharatnam phase deflector based on dual-twist design.
abstract: We have previously shown through simulation that an optical beam deflector based on the Pancharatnam (geometric) phase can provide high efficiency with up to 80° deflection using a dual-twist structure for polarization-state control [Appl. Opt.54, 10035 (2015)]. In this report, we demonstrate that its optical performance is as predicted and far beyond what could be expected for a conventional diffractive optical device. We provide details about construction and characterization of a ± 40° beam-steering device with 90% diffraction efficiency based on our dual-twist design at a 633nm wavelength.
authors.forename: Kun
authors.initials: K
authors.lastname: Gao
authors.forename: Colin
authors.initials: C
authors.lastname: McGinty
authors.forename: Harold
authors.initials: H
authors.lastname: Payson
authors.forename: Shaun
authors.initials: S
authors.lastname: Berry
authors.forename: Joseph
authors.initials: J
authors.lastname: Vornehm
authors.forename: Valerie
authors.initials: V
authors.lastname: Finnemeyer
authors.forename: Brian
authors.initials: B
authors.lastname: Roberts
authors.forename: Philip
authors.initials: P
authors.lastname: Bos