title: Polarization-dependent circular Dammann grating made of azo-dye-doped liquid crystals.
abstract: A polarization-dependent circular Dammann grating (CDG) was generated from an azo-dye-doped liquid crystal (LC) cell. A simple multiexposure photo-alignment process was used to fabricate a binary phase LC CDG zone plane, which was composed of an odd zone with a twisted nematic LC structure and an even zone with a homogenous LC structure. A two-order CDG with equal-intensity rings was produced through a Fourier transform. The maximum zeroth and first diffraction orders of obtained CDG can be separately achieved by rotating the analyzer's polarization direction. The CDG using an azo-dye-doped LC cell can be used to generate diffractions by lasers in a broad wavelength range, hence expanding possible device applications.
authors: School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore.
authors: Dan
authors: D
authors: Luo
authors: Xiao Wei
authors: XW
authors: Sun
authors: Hai Tao
authors: HT
authors: Dai
authors: Hilmi Volkan
authors: HV
authors: Demir