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Electromagnetic generalized Schell-model vortex beams.

Jingnan Yang, Zhangrong Mei, Yakun Wang

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    Researchers explored a new class of electromagnetic vortex beams with unique coherence properties. Tuning parameters like beam order and topological charge enables novel beam manipulation and propagation phenomena.

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    Area of Science:

    • Optics and Photonics
    • Electromagnetism
    • Beam Physics

    Background:

    • Generalized Schell-model beams are crucial in optical physics.
    • Vortex beams carry orbital angular momentum, enabling specialized applications.
    • Existing coherence models typically rely on Euclidean distance.

    Purpose of the Study:

    • To introduce and investigate a novel class of electromagnetic generalized Schell-model vortex beams.
    • To define the realizability conditions for generating these unique beams.
    • To analyze their far-field characteristics and propagation dynamics.

    Main Methods:

    • Theoretical formulation of the generalized Schell-model vortex beam.
    • Derivation of realizability conditions for source parameters.
    • Numerical simulations to study far-field spectral density and degree of polarization.

    Main Results:

    • The source coherence function depends on the nth power difference of positional coordinates.
    • Parameter tuning (beam order n, topological charge l, coherence length, phase factor a) influences propagation.
    • Observed phenomena include beam rotation, intensity centroid shift, and Airy-vortex-like structures.

    Conclusions:

    • A new class of electromagnetic generalized Schell-model vortex beams with non-Euclidean coherence is presented.
    • The study establishes conditions for their generation and analyzes their unique propagation behaviors.
    • This work demonstrates novel beam manipulation capabilities through tailored source coherence.