title: Large-angle and high-efficiency tunable phase grating using fringe field switching liquid crystal.
abstract: We propose a switchable phase grating using fringe field switching (FFS) cells. The FFS phase grating possesses several attractive features: large diffraction angle, high diffraction efficiency, fast response time, and high contrast ratio. It can diffract >32% light to ± 2nd orders with a large diffraction angle of 12.1°. Meanwhile, its response time remains relatively fast even at -40°C. A simulation model is developed to explain the experimental results and good agreement is obtained. We also demonstrate a blazed phase grating to achieve tunable beam steering between 0th, 1st and 2nd orders.
authors.forename: Daming
authors.initials: D
authors.lastname: Xu
authors.forename: Guanjun
authors.initials: G
authors.lastname: Tan
authors.forename: Shin-Tson
authors.initials: ST
authors.lastname: Wu