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Adding/dropping polarization multiplexed cylindrical vector beams with local polarization-matched plasmonic

Yanliang He, Zebin Huang, Canming Li

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    |December 20, 2022
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    Researchers developed a metasurface to add/drop polarization multiplexed cylindrical vector beams (CVBs). This breakthrough enables efficient optical signal processing for high-speed data transmission.

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    Area of Science:

    • Optics and Photonics
    • Metamaterials
    • Optical Communications

    Background:

    • Cylindrical vector beams (CVBs) offer unique polarization properties crucial for advanced optical applications.
    • Multiplexing orthogonal polarization states in CVBs is essential for increasing data transmission capacity.
    • Existing methods for manipulating CVBs face challenges in precise, independent control of polarization channels.

    Purpose of the Study:

    • To propose and demonstrate a novel polarization-dependent gradient phase modulation strategy.
    • To fabricate a local polarization-matched metasurface for adding and dropping polarization multiplexed CVBs.
    • To achieve independent control over radial and azimuthal polarization states within CVB multiplexing.

    Main Methods:

    • Design of meta-atoms with specific rotation angles and geometric sizes to control phase response.
    • Fabrication of a local polarization-matched plasmonic metasurface.
    • Implementation of polarization-dependent gradient phase modulation for independent channel manipulation.

    Main Results:

    • Successful addition and dropping of polarization multiplexed CVBs carrying 150-Gbit/s quadrature phase shift keying signals.
    • Achieved bit error rates as low as 1 × 10-6, demonstrating high signal fidelity.
    • Validated the effectiveness of the metasurface in independently controlling orthogonal polarization states.

    Conclusions:

    • The proposed metasurface strategy provides an effective route for adding/dropping polarization multiplexed CVBs.
    • This technique offers potential for advanced optical signal processing and high-capacity communication systems.
    • The demonstrated phase modulation capabilities open avenues for applications in polarization encryption imaging and spatial polarization shaping.