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Large asymmetric anomalous reflection in bilayer gradient metasurfaces.

Guohua Dong, Zhongjiao Jiang, Yicheng Li

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    |June 22, 2021
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    This study introduces a bilayer gradient metasurface for advanced optical control. The novel design demonstrates asymmetric reflection and symmetric transmission, crucial for wavefront modulation and optical sensing applications.

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    Area of Science:

    • Metasurfaces and Nanophotonics
    • Optical Engineering
    • Condensed Matter Physics

    Background:

    • Gradient metasurfaces offer unique capabilities for manipulating light wavefronts and polarization.
    • Bilayer structures provide enhanced control over optical phenomena.
    • Understanding the interplay between nanostructure geometry and optical response is essential.

    Purpose of the Study:

    • To design and investigate a novel bilayer gradient metasurface.
    • To explore its asymmetric anomalous reflection and symmetric anomalous transmission properties.
    • To analyze the influence of nanostructure thickness and refractive index on optical performance.

    Main Methods:

    • Numerical simulation of a bilayer gradient metasurface composed of nanorods and complementary nanoapertures.
    • Analysis of optical response at optical frequencies.
    • Systematic study of the dependence on metallic layer thickness and refractive index.

    Main Results:

    • Observed asymmetric anomalous reflection and symmetric anomalous transmission for counter-propagating waves.
    • Demonstrated significant enhancement of left-handed circularly polarized (LCP) wave reflection with increasing metallic thickness for the nanorod layer.
    • Showed a linear shift in resonant frequencies with changes in refractive index.

    Conclusions:

    • The designed bilayer gradient metasurface exhibits unique directional optical responses.
    • Thickness and refractive index are critical parameters for tuning anomalous reflection and transmission.
    • This metasurface holds promise for applications in wavefront modulation and optical sensing.