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Two-dimensional beam scanning by tunable photonic spin Hall effect.

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    Summary

    A novel tunable photonic spin Hall effect uses liquid crystal Pancharatnam-Berry lenses for precise beam scanning. This system achieves wide-angle, continuous 2D scanning for applications in laser processing and optical communications.

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    Area of Science:

    • Optics and Photonics
    • Liquid Crystal Devices
    • Nanotechnology

    Background:

    • The photonic spin Hall effect (SHE) separates light beams based on spin angular momentum.
    • Liquid crystal Pancharatnam-Berry (PB) lenses offer tunable phase control for light manipulation.

    Purpose of the Study:

    • To propose and demonstrate a novel tunable photonic spin Hall effect.
    • To achieve continuous two-dimensional beam scanning using cascaded PB lenses.

    Main Methods:

    • Utilizing a pair of liquid crystal Pancharatnam-Berry (PB) lenses.
    • Cascading two PB lenses with a relative lateral displacement.
    • Exploiting spin-dependent geometric phases for beam deflection.

    Main Results:

    • Achieved a tunable photonic spin Hall effect with a wide scanning angle (39° × 39°).
    • Demonstrated continuous 2D beam scanning with a low diverging angle (0.028° × 0.028°).
    • Successfully wrote patterns on a gold film using the scanning beam.

    Conclusions:

    • The proposed system enables precise, tunable beam scanning via the photonic spin Hall effect.
    • This technology has potential applications in laser processing, Lidar, particle manipulation, and optical communications.