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    Area of Science:

    • Photonics
    • Quantum Optics
    • Non-Hermitian Physics

    Background:

    • Exceptional points (EPs) are unique degeneracies in non-Hermitian systems.
    • Diffraction-free beam propagation is crucial for optical technologies.
    • Orbital angular momentum (OAM) beams offer unique properties for information encoding.

    Purpose of the Study:

    • To explore the application of EPs for diffraction-free beam propagation.
    • To investigate robust and tunable OAM beam propagation in discrete lattices.
    • To demonstrate localized power oscillation at EPs in non-Hermitian lattices.

    Main Methods:

    • Utilizing EPs in synthetic gauge lattices.
    • Employing unidirectionally coupled resonators for OAM beam generation.
    • Analyzing beam dynamics in discrete photonic lattices.

    Main Results:

    • Achieved diffraction-free beam propagation using EPs in two distinct systems.
    • Demonstrated robust and tunable OAM beam propagation in arbitrary lattice sites.
    • Observed localized power oscillation at the EP of a non-Hermitian lattice.

    Conclusions:

    • EPs offer a novel mechanism for controlling light propagation in photonic lattices.
    • The proposed methods enable robust OAM beam manipulation in discrete systems.
    • This research expands the utility of EPs in photonic applications, including OAM beam dynamics.