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Temperature-controlled terahertz polarization conversion bandwidth.

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    This study presents a dynamically tunable terahertz polarization converter using vanadium dioxide. It achieves broadband control, enabling applications in terahertz systems, sensing, imaging, and communications.

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    Area of Science:

    • Metasurfaces
    • Terahertz technology
    • Optoelectronics

    Background:

    • Active control of metasurfaces offers adjustable electromagnetic properties.
    • Terahertz (THz) technology is crucial for advanced applications.

    Purpose of the Study:

    • To design and experimentally study a dynamically controllable polarization converter in the terahertz band.
    • To achieve dynamic tunability of polarization conversion functions.

    Main Methods:

    • Designing structural parameters of the metasurface.
    • Utilizing the insulator-to-metal phase transition of vanadium dioxide (VO2).
    • Employing the principle of current resonance.

    Main Results:

    • Demonstrated dynamic tunability from dual-broadband (0.45–0.77 THz and 0.97–1.2 THz) to ultra-broadband (0.38–1.20 THz).
    • Achieved a high polarization conversion ratio across the tunable bands.
    • Experimental validation of the designed terahertz polarization converter.

    Conclusions:

    • The proposed scheme enables dynamic control of terahertz polarization conversion.
    • This technology has potential applications in integrated terahertz systems, sensing, imaging, and communications.