https://doi.org/10.1140/epjp/s13360-024-05559-4
Regular Article
Development of a multifunctional terahertz metasurface for simultaneous broadband absorption, polarization conversion, and wavefront manipulation
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:
4
June
2024
Accepted:
14
August
2024
Published online:
29
August
2024
A multifunctional terahertz metasurface for broadband absorption, polarization conversion, and wavefront manipulation is proposed. Vanadium dioxide (VO2), graphene, and photosensitive silicon (Si) are introduced into the structure. While VO2 is in the metallic state, the metasurface performs as a broadband absorber. The absorption bandwidth is 0.68 THz, and the relative bandwidth is 78%. By joint manipulation of the graphene Femi energy and Si conductivity, the modulation of absorption amplitude and bandwidth is realized. It is worth noticing that the bandwidth modulation is achieved without central frequency drifting. An equivalent circuit model is also explored to explain the absorption mechanism. While VO2 is in the insulating state, the metasurface acts as a polarization converter. The bandwidth of the cross-polarization reflectivity is 0.56 THz, and the relative bandwidth of PCR is 62%. Similarly, by joint modulation of the graphene Femi energy and Si conductivity, dynamic tuning of PCR amplitude and bandwidth is achieved. It is also worth noticing that PCR bandwidth modulation is obtained without central frequency drifting. In addition, through precise phase arrangement, deflected vortex beams are generated in the frequency range from 0.85 to 1.15 THz. All the results indicate that the functional metasurface has the potential applications in fields of optical stealth, communication, imaging, and so on.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. 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.
