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<p>This study presents the development of a dual-functional terahertz device based on a metasurface that integrates metallic and vanadium dioxide (VO₂) elements. The proposed metasurface is tunable through the temperature-dependent properties of VO₂, enabling switching between absorption and polarization conversion via the metal–insulator transition of VO₂. The unit cell of the proposed structure consists of a metasurface layer comprising a large metallic square ring with four VO₂-filled gaps, together with a smaller VO₂ square ring deposited on a dielectric layer above a reflective ground plane and separated by an air spacer. VO₂ exhibits a reversible metal–insulator phase transition at 68&#xa0;°C, which is accompanied by a pronounced change in both its electrical and optical properties. At room temperature (298&#xa0;K), when VO₂ is in the insulating state, the metasurface operates as a linear-to-linear cross-polarization converter (LTLPC) over a frequency range of 0.66–1.7 THz, achieving an 88% fractional bandwidth (FBW). When heated above 351&#xa0;K, VO₂ transitions to its metallic state, and the structure functions as an absorber with more than 80% absorptivity over a frequency range of 0.34–1.96 THz, corresponding to a fractional bandwidth of 140%. The proposed structure offers significant advantages, including a simplified geometry, ease of fabrication, and enhanced performance, particularly in terms of bandwidth. Most multifunctional structures reported in the literature that combine polarization conversion and electromagnetic wave absorption rely on multilayer metasurfaces and complex resonant patterns, which suffer from drawbacks such as increased structural thickness, fabrication complexity, and limited operating bandwidth. By combining high-performance broadband functionality with active thermal tunability, this work provides a practical and scalable platform for switchable and reconfigurable terahertz components, with strong potential for applications in terahertz measurement and communication systems.</p>

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Dual functional device featuring absorption and polarization conversion based on temperature controlled metasurface for terahertz applications

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  • 发表日期：

    2026年5月6日

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  • Saeedeh Barzegar-Parizi

摘要

This study presents the development of a dual-functional terahertz device based on a metasurface that integrates metallic and vanadium dioxide (VO₂) elements. The proposed metasurface is tunable through the temperature-dependent properties of VO₂, enabling switching between absorption and polarization conversion via the metal–insulator transition of VO₂. The unit cell of the proposed structure consists of a metasurface layer comprising a large metallic square ring with four VO₂-filled gaps, together with a smaller VO₂ square ring deposited on a dielectric layer above a reflective ground plane and separated by an air spacer. VO₂ exhibits a reversible metal–insulator phase transition at 68 °C, which is accompanied by a pronounced change in both its electrical and optical properties. At room temperature (298 K), when VO₂ is in the insulating state, the metasurface operates as a linear-to-linear cross-polarization converter (LTLPC) over a frequency range of 0.66–1.7 THz, achieving an 88% fractional bandwidth (FBW). When heated above 351 K, VO₂ transitions to its metallic state, and the structure functions as an absorber with more than 80% absorptivity over a frequency range of 0.34–1.96 THz, corresponding to a fractional bandwidth of 140%. The proposed structure offers significant advantages, including a simplified geometry, ease of fabrication, and enhanced performance, particularly in terms of bandwidth. Most multifunctional structures reported in the literature that combine polarization conversion and electromagnetic wave absorption rely on multilayer metasurfaces and complex resonant patterns, which suffer from drawbacks such as increased structural thickness, fabrication complexity, and limited operating bandwidth. By combining high-performance broadband functionality with active thermal tunability, this work provides a practical and scalable platform for switchable and reconfigurable terahertz components, with strong potential for applications in terahertz measurement and communication systems.