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    Area of Science:

    • Metamaterials and Nanophotonics
    • Terahertz (THz) Technology
    • Phase-Change Materials

    Background:

    • Tunable and multifunctional metastructures (MSs) are crucial for advanced terahertz (THz) applications.
    • Vanadium dioxide (VO2) exhibits a temperature-dependent phase transition, enabling dynamic control of material properties.

    Purpose of the Study:

    • To design and demonstrate a novel MS with dual functionalities: cross-polarization conversion and absorption.
    • To achieve temperature-controlled switching between these two distinct THz functions.

    Main Methods:

    • Utilized the phase transition property of VO2 triggered by thermal excitation.
    • Proposed a metastructure integrating VO2 for tunable THz response.
    • Performed electromagnetic simulations to analyze performance under different temperature conditions.

    Main Results:

    • At high temperatures (>68°C), the MS demonstrated narrow-band absorption (0.67–0.95 THz).
    • Below 68°C, the MS functioned as a broadband cross-polarization converter (0.69–1.38 THz) with >90% conversion ratio and 66.7% relative bandwidth.
    • Detailed analysis of field distributions, surface currents, impedance, and power loss was conducted.

    Conclusions:

    • The proposed tunable MS successfully integrates both absorption and cross-polarization conversion functionalities.
    • Temperature control provides a simple and effective mechanism for switching between the two distinct THz operations.
    • The dual-functionality and tunability make this MS suitable for complex THz applications.