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    Area of Science:

    • Optics
    • Quantum Optics
    • Photonics

    Background:

    • Polarized light rotation is a known phenomenon linked to spin angular momentum (SAM).
    • Orbital angular momentum (OAM) describes the phase front's helical structure in light beams.
    • Differential phase shifts between OAM modes are crucial for optical manipulation.

    Purpose of the Study:

    • To investigate an analogous effect of polarization rotation for orbital angular momentum (OAM).
    • To explore the amplification of this OAM-induced rotation using slow-light media.
    • To quantify the observed rotation and its relation to beam properties.

    Main Methods:

    • Transmission of light through a spinning medium.
    • Utilizing a slow-light medium to enhance phase differences.
    • Characterization of the transmitted beam's spatial profile and rotation.

    Main Results:

    • Observed a differential phase shift between positive and negative OAM modes (±ℓ).
    • Demonstrated image rotation corresponding to the OAM-induced phase shift.
    • Achieved a significant rotation of a few degrees using a slow-light medium, compared to micro radians in normal materials.

    Conclusions:

    • An optical effect analogous to SAM-induced polarization rotation was demonstrated for OAM.
    • Slow-light media can dramatically enhance OAM-induced image rotation.
    • The observed rotation is within the scale of spatial features for the experimental parameters.