title: Electrically controlling spin and orbital angular momentum of a focused light beam in a uniaxial crystal.
abstract: We propose a method for controlling the local spin and orbital angular momentum (SAM and OAM) of a focused light beam in a uniaxial crystal by means of Pockels effect. For an input circularly polarized Bessel-Gaussian (BG) beam, both the local SAM and OAM of the output beam are circularly symmetric, their patterns and peak values vary with the applied electric field E(0). Let the output beam pass through a quarter-wave plate, the OAM keeps while the SAM varies. The local SAM density is nearly directly proportional to ± sin(2φ), where φ is the azimuthal angle and the signs are dependent on the radius and E(0).
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, China.
authors.forename: Wenguo
authors.initials: W
authors.lastname: Zhu
authors.forename: Weilong
authors.initials: W
authors.lastname: She
mesh_terms: D003198:Computer Simulation; D003460:Crystallization; D004735:Energy Transfer; D004867:Equipment Design; D008027:Light; D015233:Models, Statistical; D009038:Motion; D016011:Normal Distribution; D052898:Optical Tweezers; D055095:Optics and Photonics; D010825:Physics / Q000379:methods; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation