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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetics and Wave Phenomena

    Background:

    • Integrating multiple electromagnetic functionalities into a single flat device is essential for advanced applications.
    • Current multifunctional metasurfaces often achieve only two distinct functions, limiting their applicability.
    • Developing meta-devices with enhanced functional diversity is a key research challenge.

    Purpose of the Study:

    • To propose a generic strategy for designing trifunctional metasurfaces.
    • To demonstrate a proof-of-concept trifunctional metasurface with polarization-controlled properties.
    • To enable simultaneous beam splitting, deflecting, and focusing using a single meta-device.

    Main Methods:

    • Design of meta-atoms with polarization-controlled transmission/reflection characteristics.
    • Fabrication of a trifunctional metasurface based on the designed meta-atoms.
    • Experimental validation using far-field and near-field microwave measurements.
    • Comparison of experimental results with numerical simulations.

    Main Results:

    • Successful design and fabrication of a trifunctional metasurface.
    • Experimental demonstration of simultaneous beam splitting, deflecting, and focusing.
    • Good agreement between experimental outcomes and numerical simulations.
    • Validation of the proposed generic strategy for multifunctional metasurface design.

    Conclusions:

    • The proposed strategy enables the creation of metasurfaces with multiple, diversified functionalities.
    • The fabricated trifunctional metasurface successfully exhibited beam splitting, deflecting, and focusing.
    • This work paves the way for high-performance multifunctional meta-devices across various frequency domains.