Generation of THz Vortex Beams and Interferometric Determination of Their Topological Charge

被引：5
作者：
Pinnock, Samuel W. [1 ]
Roh, Seulki [1 ]
Biesner, Tobias [1 ]
Pronin, Artem V. [1 ]
Dressel, Martin [1 ]
机构：
[1] Univ Stuttgart, Phys Inst 1, D-70569 Stuttgart, Germany
来源：
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY | 2023年 / 13卷 / 01期
关键词：
Time-domain analysis; Spirals; Refractive index; Optical vortices; Frequency-domain analysis; Extraterrestrial measurements; Beams; 3-D printed optical components; frequency-domain terahertz (THz) spectroscopy; Laguerre-Gaussian beams; orbital angular momentum (OAM); spiral phase plates (SPPs); THz vortex beams; topological charge; ORBITAL ANGULAR-MOMENTUM; OPTICAL VORTEX; PHASE; LIGHT; VORTICES;
D O I：
10.1109/TTHZ.2022.3221369
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
this article, we developed and demonstrated the efficacy of 3-D printed spiral phase plates (SPPs) for the generation of vortex terahertz (THz) beams with angular momenta P = +/- 1 and P = +/- 2. The vortex beam generation was confirmed by means of frequency-domain transmission spectroscopy. The topological charge P of the vortex beams was determined via phase-sensitive Mach-Zehnder interferometry, which enabled the superposition of a vortex beam with P and its conjugate beam with -P. The resulting interference patterns were found to be consistent with the expected intensity distributions for a given P, which provides strong confirmation of the spatial phase structure of the generated vortex beams in the THz regime.
引用
收藏
页码：44 / 49
页数：6
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