Open AccessGeneration and evolution of the terahertz vortex beam
Author(s) -
Jingwen He,
Xinke Wang,
Dan Hu,
Jiasheng Ye,
Shengfei Feng,
Qiang Kan,
Yan Zhang
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.020230
Subject(s) - terahertz radiation , optics , optical vortex , physics , vortex , phase (matter) , holography , beam (structure) , light beam , gaussian beam , field (mathematics) , topological quantum number , rotation (mathematics) , quantum mechanics , geometry , mathematics , pure mathematics , thermodynamics
Based on the complementary V-shaped antenna structure, ultrathin vortex phase plates are designed to achieve the terahertz (THz) optical vortices with different topological charges. Utilizing a THz holographic imaging system, the two dimensional complex field information of the generated THz vortex beam with the topological number l=1 is directly obtained. Its far field propagation properties are analyzed in detail, including the rotation, the twist direction, and the Gouy phase shift of the vortex phase. An analytic Laguerre-Gaussian mode is used to simulate and explain the measured phenomena. The experimental and simulation results overlap each other very well.