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Tunable dual-band dual-polarization terahertz polarization converter and coding metasurfaces based on Weyl semimetals

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Abstract

In this work, the tunable dual-band split ring terahertz (THz) polarization converter is proposed based on Weyl semimetals (WSMs). By changing the chemical potential of the WSMs, the polarization converter can realize the frequency-dependent linear–linear and circular–circular cross-polarization conversion in the two bands of 1.21–1.29 THz and 1.97–2.04 THz, respectively. The achieved polarization converter ratio (PCR) is higher than 99% for the two types of cross polarizations. Besides, the WSM-based polarization conversion also shows 2π phase shift and amplitude modulation by rotating the azimuth angles of the split ring. Furthermore, the 3-bit coding metasurfaces can achieve tunable linear–linear, circular–circular, and linear–circular beam modulation by adjusting the chemical potential of the WSMs. The proposed tunable metasurface would have wide applications in multiband cross-polarizations and different types of wave modulation with linear–linear, circular–circular, and linear–circular.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the National Natural Science Foundation of China, (No. 62175016, 61875017, and 61976022).

Author information

Authors and Affiliations

  1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Linlin Dai, Limei Qi & Junaid Ahmed Uqaili

  2. Department of Computer Science, Dawood University of Engineering and Technology, Karachi, 74800, Pakistan

    Junaid Ahmed Uqaili

  3. College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China

    Yuping Zhang & Huiyun Zhang

  4. School of Computer Science (National Pilot Software Engineering School), Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Feifei Kou

  5. State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Yang Yang

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  1. Linlin Dai
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Contributions

Conceptualization: YZ, HZ; Methodology: LD; Formal analysis and investigation: LQ; Writing—original draft preparation: LD; Writing—review and editing: LQ, FK, YY. All authors reviewed the manuscript.

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Correspondence to Limei Qi.

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Dai, L., Qi, L., Uqaili, J.A. et al. Tunable dual-band dual-polarization terahertz polarization converter and coding metasurfaces based on Weyl semimetals. Appl. Phys. B 129, 81 (2023). https://doi.org/10.1007/s00340-023-08026-7

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