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Vortex solitons in moiré optical lattices.

Sergey K Ivanov, Vladimir V Konotop, Yaroslav V Kartashov

    Optics Letters
    |July 14, 2023
    PubMed
    Summary

    Optical moiré lattices create novel vortex solitons in nonlinear optics. Their properties, including formation power and stability, depend significantly on lattice geometry and twist angles.

    Area of Science:

    • Nonlinear optics
    • Condensed matter physics
    • Photonic lattices

    Background:

    • Vortex solitons are fundamental nonlinear optical states.
    • Moiré lattices offer unique geometries for controlling light propagation.
    • Understanding soliton behavior in complex lattices is crucial for optical applications.

    Purpose of the Study:

    • To investigate the existence and properties of vortex solitons in optical moiré lattices.
    • To analyze the influence of lattice geometry (commensurate vs. incommensurate) on soliton characteristics.
    • To explore soliton behavior across different regimes, including below and above the localization-delocalization transition.

    Main Methods:

    • Theoretical analysis of light propagation in self-focusing Kerr media.

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  • Numerical simulations of vortex soliton formation and stability.
  • Investigation of commensurate and incommensurate moiré lattice geometries.

    • Main Results:

    • Optical moiré lattices support diverse types of vortex solitons.
    • Formation threshold power is highly sensitive to the lattice twist angle.
    • Soliton families show intervals of linear power dependence and strong stability.
    • Stable embedded vortex solitons were found in the incommensurate phase above the transition.

    Conclusions:

    • Optical moiré lattices provide a versatile platform for generating and controlling vortex solitons.
    • Lattice geometry and twist angle are critical parameters for tuning soliton properties.
    • The findings offer new possibilities for designing advanced optical devices and phenomena.