https://doi.org/10.1140/epjp/s13360-025-06377-y
Regular Article
Vanadium dioxide-assisted terahertz metasurface for broadband polarization conversion and multi-mode vortex beam generation in full-space
1
School of Science, Harbin University of Science and Technology, 150080, Harbin, China
2
State Key Laboratory Breeding Base of Dielectric Engineering, Harbin University of Science and Technology, 150080, Harbin, China
3
Harbin Research Institute of Electrical Instruments, 150080, Harbin, China
a
zhangying20151221@hrbust.edu.cn
Received:
7
February
2025
Accepted:
28
April
2025
Published online:
21
May
2025
In this paper, a terahertz (THz) metasurface for broadband polarization conversion and multi-mode vortex beam generation assisted by vanadium dioxide (VO2) is proposed. The unit cell is composed of two grating layers parallel to the x-axis and y-axis, respectively, a metal patterned layer, and two dielectric layers. The metal patterned layer consists of a gold cross and a resonant ring with VO2 filling the opening. In the frequency from 0.26 to 1.32 THz, a cross-polarization conversion rate (PCR) of over 99.9% can be realized, corresponding to a relative bandwidth of 134.2%. By manipulating VO2 conductivity, dynamic tuning of PCR is obtained. Through precise interlaced phase arrangement by adjusting the angle and width of the metal pattern, three operating modes carrying different functions are formed. While a linear polarization THz wave is incident vertically into the metasurface along the positive and negative directions, respectively, six vortex beam channels with different quantities and topological charges can be achieved. Owing to the orbital angular momentum carried by different vortex beams, the proposed metasurfaces have the potential application prospects in 6G THz communication.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
