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Real-time multi-functional near-infrared wave manipulation with a 3-bit liquid crystal based coding metasurface.

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    We developed reprogrammable metasurfaces using liquid crystals for dynamic wave control. These devices enable versatile optical beam manipulation for advanced applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Metasurfaces offer advanced control over light waves.
    • Liquid crystals provide tunable optical properties due to large birefringence.

    Purpose of the Study:

    • To introduce a new generation of reprogrammable, multi-functional metasurfaces.
    • To demonstrate dynamic wave manipulation using liquid crystal-based metasurfaces.

    Main Methods:

    • Designing a 3-bit coding metasurface (CM) with liquid crystal unit-cells.
    • Utilizing the large birefringence of liquid crystals for phase control.
    • Simulating and analyzing the manipulation of scattered waves at λ=1.4µm.

    Main Results:

    • Successfully realized steered pencil, regular, and focused vortex beams.
    • Demonstrated the metasurface's ability to achieve 8 distinct phase states ('000'-'111').
    • Validated theoretical predictions through numerical simulations.

    Conclusions:

    • The proposed coding metasurface enables multifunctional optical wavefront manipulation.
    • This technology paves the way for future intelligent optical devices.
    • Reprogrammable metasurfaces offer dynamic control over light propagation.