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Multifunctional tunable gradient metasurfaces for terahertz beam splitting and light absorption.

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    We developed tunable terahertz (THz) gradient metasurfaces using VO2 and graphene. These multifunctional devices act as switchable beamsplitters and tunable absorbers for advanced THz applications.

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    Area of Science:

    • Terahertz (THz) science and technology
    • Metamaterials and Nanophotonics

    Background:

    • Advancing terahertz (THz) science necessitates devices with tunable functionalities.
    • Gradient metasurfaces offer a promising platform for manipulating THz waves.

    Purpose of the Study:

    • To propose and investigate multifunctional gradient metasurfaces for tunable THz applications.
    • To demonstrate switchable beam splitting and resonant absorption capabilities.

    Main Methods:

    • Fabrication of gradient metasurfaces comprising silicon microcylinders integrated with vanadium dioxide (VO2) and graphene.
    • Characterization of metasurface behavior in both transmittive and reflective modes.
    • Tuning of device properties via modification of graphene's chemical potential.

    Main Results:

    • Metasurfaces exhibit switchable transmittive (dielectric phase) and reflective (metallic phase) beam splitting based on VO2 phase transitions.
    • Integration with graphene allows for tunable beam intensity and nearly perfect resonant absorptions.
    • Demonstrated tunability of optical properties through graphene chemical potential modulation.

    Conclusions:

    • The proposed multifunctional gradient metasurfaces offer versatile control over THz wave manipulation.
    • These devices hold potential for applications in THz interferometers, multiplexers, and advanced absorbers.
    • The integration of VO2 and graphene provides a pathway for novel tunable THz devices.