Direct Measurement of the Millimeter Wave Phase Singularity with Helical Wavefront using Heterodyne Detection System at Two Spatial Points

In this paper, we measured the one-dimensional phase and polarization structure of a millimeter-wave with a helical wavefront (vortex beam) using a simultaneous heterodyne detection system at two spatial points. This is a novel approach, and it provides us with the relative phase of the vortex beam....

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Bibliographic Details
Published in:Plasma and Fusion Research 2022/03/18, Vol.17, pp.2401007-2401007
Main Authors: GOTO, Yuki, KUBO, Shin, TSUJIMURA, Toru Ii, KOBAYASHI, Toru
Format: Article
Language:English
Subjects:
Antennas
Electron beams
helical wavefront
heterodyne detection system
Millimeter waves
millimeter-wave
phase singularity
Polarization
vortex beam
Wave fronts
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Summary:In this paper, we measured the one-dimensional phase and polarization structure of a millimeter-wave with a helical wavefront (vortex beam) using a simultaneous heterodyne detection system at two spatial points. This is a novel approach, and it provides us with the relative phase of the vortex beam. We measured the phase discontinuity of the vortex beam by scanning the one-dimensional path where an antenna passes through the optical axis. It was found that relative phases gradually increase or decrease when the antenna does not pass through the optical axis. Additionally, we measured polarization parameters, which were indefinite near the optical axis. In other words, the optical axis of the vortex beam is a singular point about the phase.
ISSN:1880-6821
1880-6821
DOI:10.1585/pfr.17.2401007