Direction-discriminated rotational Doppler velocimetry with circularly polarized vortex beam

2022 ◽  
Author(s):  
Zhenyu Wan ◽  
Liang Fang ◽  
Jian Wang
Keyword(s):  
Doppler Velocimetry ◽  
Vortex Beam ◽  
Circularly Polarized

scholarly journals Longitudinal Component Properties of Circularly Polarized Terahertz Vortex Beams

2021 ◽  
Vol 9 ◽  
Author(s):  
Miao Wang ◽  
Xinke Wang ◽  
Peng Han ◽  
Wenfeng Sun ◽  
Shengfei Feng ◽  
...  
Keyword(s):  
Spot Size ◽  
Longitudinal Component ◽  
Transverse Component ◽  
Quarter Wave Plate ◽  
Phase Plate ◽  
Vortex Beam ◽  
Circularly Polarized ◽  
Left Hand ◽  
Quarter Wave ◽  
Focusing Properties

A circularly polarized vortex beam possesses similar focusing properties as a radially polarized beam. This type of beam is highly valuable for developing optical manufacturing technology, microscopy, and particle manipulation. In this work, a left-hand circularly polarized terahertz (THz) vortex beam (CPTVB) is generated by utilizing a THz quarter wave plate and a spiral phase plate. Focusing properties of its longitudinal component Ez are detailedly discussed on the simulation and experiment. With reducing the F-number of the THz beam and comparing with a transverse component Ex of a general circularly polarized THz beam, the simulation results show that the focal spot size and intensity of its Ez component can reach 87 and 50% of Ex under a same focusing condition. In addition, the experimental results still demonstrate that the left-hand CPTVB can always maintain fine Ez focusing properties in a broad bandwidth, which manifest the feasibility of this class of THz beams.

Deformations of circularly polarized Bessel vortex beam reflected and transmitted by a uniaxial anisotropic slab

2018 ◽  
Vol 57 (25) ◽  
pp. 7353 ◽  
Author(s):  
Haiying Li ◽  
Jiawei Liu ◽  
Lu Bai ◽  
Zhensen Wu
Keyword(s):  
Vortex Beam ◽  
Circularly Polarized ◽  
Anisotropic Slab

Planar Vortex Beam Generator for Circularly Polarized Incidence Based on FSS

2020 ◽  
Vol 68 (3) ◽  
pp. 1514-1522 ◽  
Author(s):  
Yuxiang Wang ◽  
Kuang Zhang ◽  
Yueyi Yuan ◽  
Xumin Ding ◽  
Badreddine Ratni ◽  
...  
Keyword(s):  
Vortex Beam ◽  
Circularly Polarized

scholarly journals Fully symmetric diffraction-interference beam shaper for radially polarized light on a 1530-nm wavelength

2019 ◽  
Vol 43 (4) ◽  
pp. 577-585 ◽  
Author(s):  
V.V. Podlipnov ◽  
S.V. Karpeev ◽  
V.D. Paranin
Keyword(s):  
Sandwich Structure ◽  
Polarized Light ◽  
Vortex Beam ◽  
Radial Polarization ◽  
Circularly Polarized ◽  
Polarized Beam ◽  
Diffraction Angle ◽  
Radially Polarized ◽  
Radially Polarized Light ◽  
Polarized Radiation

A completely symmetrical scheme of a shaper of cylindrical vector beams is proposed in which two diffractive axicons and an interference polarizer placed in-between form a sandwich structure of the smallest possible thickness. The design and experimental study of an interference polarizer for generating the radially polarized radiation at a 1530-nm wavelength is carried out. A pair of amplitude diffractive axicons with a period of 3.62 μm to provide the diffraction angle of 24.5° required for generating radial polarization is fabricated. The transformation of a circularly polarized beam into a radially polarized vortex beam is experimentally demonstrated.

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