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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Tunable multifunctional reflection polarizer based on a graphene metasurface.

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    We developed a tunable graphene metasurface polarizer for mid-infrared light. This device achieves dual-band linear-to-linear polarization conversion and can be tuned for broadband or linear-to-circular conversion.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Metasurfaces offer advanced control over light polarization.
    • Graphene's unique electronic properties enable tunable optical devices.

    Purpose of the Study:

    • To design and demonstrate a tunable multifunctional reflection polarizer using a graphene metasurface.
    • To achieve dual-band linear-to-linear (LTL) polarization conversion in the mid-infrared region.

    Main Methods:

    • Fabrication of a graphene metasurface composed of cross double-ellipse graphene patches.
    • Numerical simulations to analyze polarization conversion properties.
    • Investigation of tunability via Fermi energy and electron scattering time.

    Main Results:

    • Achieved dual-band LTL polarization conversion due to superimposed reflection components with specific phase differences.
    • Demonstrated linear-to-circular polarization conversion and broadband LTL conversion (~0.7 THz).
    • Showcased tunable responses by altering graphene's Fermi energy and electron scattering time.

    Conclusions:

    • The proposed graphene metasurface acts as a versatile reflection polarizer.
    • The device offers multifunctional and tunable polarization conversion capabilities for mid-infrared applications.