Li, M., Gu, Z., Kumar, C. H., Liu, N., Dutin, F., Szriftgiser, P., Ducournau, G., & Pitchappa, P. (2026). Wide-Angle Reflective Terahertz Beam Steering Metasurface Based on Cross-Polarization Conversion. IEEE Transactions on Terahertz Science and Technology, 16(3), 307–317. https://doi.org/10.1109/tthz.2025.3626144
Abstract:
The terahertz (THz) frequency range is considered an important spectrum for future six-generation communication. However, the high propagation losses and poor penetration inherent to THz waves restricted its development. Wavefront manipulation techniques for beam steering to redirect the propagation directions are essential for mitigating these limitations. In this article, cross-polarization conversion-based phase engineering for THz reflective beam steering is presented. This approach has the advantages of enabling quasi-linear phase response with sufficient phase-shifting range and maintaining high reflection magnitudes over a wide frequency band. Furthermore, a four-port equivalent circuit is developed to explain the design principle and verify the effectiveness of the polarizers. As a result, the metasurfaces composed of the proposed unit cells achieve stable wide-angle beam steering with high reflection intensity and have continuous frequency-scanning capability. In addition, the metasurfaces are verified to support the high-quality quadrature amplitude modulation with 16 states with an acceptable power penalty in a non-line-of-sight THz link.
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Funding Info:
This research / project is supported by the Agency for Science, Technology and Research, Singapore - Manufacturing, Trade, and Connectivity Programmatic
Grant Reference no. : M22L1b0110
This research / project is supported by the Ministry of Higher Education and Research, the Hauts-de-France Regional council, the Lille European Metropolis (MEL), the Institute of Physics of the French National Centre for Scientific Research (CNRS) and the European Regional Development Fund (ERDF). - CPER Wavetech
Grant Reference no. : NA
This research / project is supported by the Agence Nationale de la Recherche - FUNTERA, PEPR ‘Electronics’
Grant Reference no. : ANR-22-PEEL-0006
This research / project is supported by the Agence Nationale de la Recherche - NF-SYSTERA, PEPR 5G and beyond - Future Networks
Grant Reference no. : ANR-22-PEFT-0006
This research / project is supported by the Agence Nationale de la Recherche - French RENATECH network, the Equipex+ Nanofutur
Grant Reference no. : IA-21-ESRE-0012
This research / project is supported by the CDP C2EMPI, the French State under the France-2030 program, the University of Lille, the Initiative of Excellence of the University of Lille, the European Metropolis of Lille - France 2030 Programs
Grant Reference no. : R-CDP-24-004-C2EMPI