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Multi-functional polarization conversion manipulation via graphene-based metasurface reflectors.

Houjiao Zhang, Ye Liu, Zhengqi Liu

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    |December 28, 2020
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    We developed a novel hollow graphene metasurface for efficient polarization conversion. This device offers broadband cross-polarization conversion and tunable linear-to-circular polarization conversion, enabling advanced optical components.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Optoelectronics
    • Condensed Matter Physics

    Background:

    • Polarization conversion is crucial for optical communication and sensing.
    • Graphene metasurfaces offer tunable optical properties for advanced functionalities.

    Purpose of the Study:

    • To design and demonstrate an efficient polarization conversion device using a hollow graphene metasurface.
    • To achieve broadband cross-polarization conversion and dual-frequency linear-to-circular polarization conversion.

    Main Methods:

    • Utilizing a hollow graphene metasurface structure.
    • Investigating polarization conversion ratios (PCR) and bandwidth under oblique incidence.
    • Tuning Fermi energy of graphene to switch conversion functions.

    Main Results:

    • Achieved broadband x-to-y cross-polarization conversion (CPC) with near unity polarization conversion ratio (PCR) up to 1.83 THz (χPCR ≥98.8%).
    • Demonstrated dual-frequency linear-to-circular polarization conversion (LTC-PC).
    • Exhibited high frequency shift sensitivity (S) of 23.09 THz/eV for polarization conversion function manipulation.

    Conclusions:

    • The proposed device offers simultaneous broadband CPC and switchable LTC-PC functions.
    • The graphene metasurface exhibits excellent performance under wide oblique incidence angles.
    • Potential applications in integrated polarization sensors, switches, and optical components.