title: Modulation of shape and polarization of beam using a liquid crystal q-plate that is fabricated via photo-alignment.
abstract: A liquid crystal (LC) device, called a "q-plate" (QP), which is based on axially symmetric photo-alignment was investigated. The electrically tunable LC QP device could be modulated to control the shape and polarization of a linearly polarized Gaussian laser beam that propagated through it. The intensity profile and polarization distribution were simulated by MATLAB and 1D-DIMOS. The results of the simulation were consistent with experimental findings. In the fabricated electrically tunable LC QP device, switching between different beam-profile configurations can be realized by applying a voltage. Moreover, the fabrication of an LC QP is relatively simple, and the device has potential for such practical applications as beam shape modulators and spatial polarization converters use in diffractive optics and imaging systems.
authors.affiliation: Department of Physics, National Cheng Kung University, Tainan 701, Taiwan.
authors.forename: Yao-Han
authors.initials: YH
authors.lastname: Huang
authors.forename: Shih-Wei
authors.initials: SW
authors.lastname: Ko
authors.forename: Ming-Shian
authors.initials: MS
authors.lastname: Li
authors.forename: Shu-Chun
authors.initials: SC
authors.lastname: Chu
authors.forename: Andy Y-G
authors.initials: AY
authors.lastname: Fuh
mesh_terms: D003198:Computer Simulation; D004574:Electromagnetic Fields; D004581:Electronics / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D050866:Liquid Crystals / Q000737:chemistry* / Q000528:radiation effects; D008962:Models, Theoretical; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation