Vectorial diffraction properties of THz vortex Bessel beams

被引：0
|
作者：
Wu Z. [1 ]
Wang X. [1 ]
Sun W. [1 ]
Feng S. [1 ]
Han P. [1 ]
Jiasheng Y.E. [1 ]
Yu Y. [2 ]
Zhang Y. [1 ]
机构：
[1] Department of Physics, Beijing Key Lab for Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics Ministry of Education, Beijing Advanced Innovation Center for Imaging Technology, Capital Normal University, Beijing
来源：
Wang, Xinke (wxk82721@cnu.edu.cn) | 2018年 / The Optical Society卷 / 26期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Optical devices - Bessel functions - Geometrical optics - Wavefronts - Diffraction - Terahertz waves - Optical communication - Laser beams;
D O I：
10.1364/oe.26.001506
中图分类号：
学科分类号：
摘要：
A vortex Bessel beam combines the merits of an optical vortex and a Bessel beam, including a spiral wave front and a non-diffractive feature, which has immense application potentials in optical trapping, optical fabrication, optical communications, and so on. Here, linearly and circularly polarized vortex Bessel beams in the terahertz (THz) frequency range are generated by utilizing a THz quarter wave plate, a spiral phase plate, and Teflon axicons with different opening angles. Taking advantage of a THz focal-plane imaging system, vectorial diffraction properties of the THz vortex Bessel beams are comprehensively characterized and discussed, including the transverse (Ex, Ey) and longitudinal (Ez) polarization components. The experimental phenomena are accurately simulated by adopting the vectorial Rayleigh diffraction integral. By varying the opening angle of the axicon, the characteristic parameters of these THz vortex Bessel beams are exhibited and compared, including the light spot size, the diffraction-free range, and the phase evolution process. This work provides the precise experimental and theoretical bases for the comprehension and application of a THz vortex Bessel beam. © 2018 Optical Society of America.
引用
收藏
页码：1506 / 1520
页数：14
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