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Optically transparent and microwave diffusion coding metasurface by utilizing ultrathin silver films.

Heyan Wang, Yujia Sun, Yilei Zhang

    Optics Express
    |November 23, 2021
    PubMed
    Summary

    This study introduces a novel coding metasurface for broadband microwave applications. The design achieves low specular reflection and uniform backward scattering, enhancing performance for radar and shielding applications.

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    Area of Science:

    • Metamaterials and Nanophotonics
    • Electromagnetics and Wave Phenomena
    • Applied Physics

    Background:

    • Artificial metamaterials offer advanced control over electromagnetic waves using effective medium parameters.
    • Metasurfaces, engineered surfaces with subwavelength structures, enable novel electromagnetic functionalities.
    • Controlling specular reflection and scattering is crucial for various electromagnetic applications.

    Purpose of the Study:

    • To present a scheme for achieving broadband microwave low specular reflection with uniform backward scattering.
    • To design and demonstrate a coding metasurface using ultrathin doped silver elements.
    • To explore the potential of this metasurface for diverse microwave and optical applications.

    Main Methods:

    • Utilizing a rational layout of subwavelength coding elements within a metasurface structure.
    • Employing an optimization method for designing the coding elements and metasurface.
    • Designing ultrathin doped silver coding elements for high transparency and large phase differences (~180°).

    Main Results:

    • Achieved broadband low specular reflection from 12 to 18 GHz.
    • Demonstrated uniform backward scattering with high angular insensitivity (±40°) for both transverse electric and transverse magnetic polarizations.
    • Verified results through numerical simulations and experimental validation.

    Conclusions:

    • The developed coding metasurface effectively reduces microwave reflection and provides uniform backward scattering.
    • The design exhibits excellent visible transparency, making it suitable for combined microwave and optical applications.
    • Potential applications include electronic surveillance, electromagnetic interference shielding, and radar cross-section reduction.