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    We observed orbital Hall effect (OHE) in light diffraction, causing OAM-dependent shifts. This led to a new, alignment-free method for measuring optical vortex states.

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics
    • Wave Phenomena

    Background:

    • Optical vortex beams possess orbital angular momentum (OAM).
    • Diffraction of light through obstacles can break symmetry.
    • The orbital Hall effect (OHE) describes OAM-dependent shifts in wave propagation.

    Purpose of the Study:

    • To investigate the orbital Hall effect (OHE) of light in the diffraction of optical vortex beams.
    • To develop a novel, alignment-free method for measuring OAM states using OHE.

    Main Methods:

    • Observing Fraunhofer patterns of optical vortex beams diffracted by a thin single wire.
    • Analyzing OAM-helicity-dependent centroid shifts in diffraction patterns.
    • Experimentally implementing a cross-wire setup to leverage OHE for OAM measurement.

    Main Results:

    • Significant OAM-helicity-dependent centroid shifts were observed in far-field diffraction patterns.
    • The observed shifts confirm the occurrence of the orbital Hall effect (OHE) in light diffraction.
    • A compact, robust, and alignment-free method for measuring OAM states was successfully developed.

    Conclusions:

    • The orbital Hall effect (OHE) provides insights into vortex beam diffraction with broken rotational symmetry.
    • OHE offers a reliable and efficient approach for simplifying vortex state measurements.
    • The developed method has potential applications for various wave types.