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Light bullets in moiré lattices.

Yaroslav V Kartashov

    Optics Letters
    |September 1, 2022
    PubMed
    Summary

    Stable 3D light bullets can form in photonic moiré lattices. Their stability depends on lattice periodicity, with aperiodic structures supporting threshold-free bullets.

    Area of Science:

    • Nonlinear optics
    • Photonics
    • Condensed matter physics

    Background:

    • Photonic moiré lattices offer unique optical properties.
    • Kerr nonlinearity enables complex light-matter interactions.
    • Stable three-dimensional (3D) light bullets are localized light structures.

    Purpose of the Study:

    • To investigate the conditions for stable 3D light bullets in photonic moiré lattices.
    • To explore the role of lattice periodicity and twist angles on light bullet stability.
    • To analyze the connection between linear eigenmode properties and nonlinear state stability.

    Main Methods:

    • Theoretical prediction of light bullet formation.
    • Analysis of linear spatial eigenmodes in moiré lattices.
    • Investigation of the localization-delocalization transition (LDT).

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  • Distinguishing between commensurate (periodic) and incommensurate (aperiodic) moiré structures.

    • Main Results:

    • Stable 3D light bullets can be supported by photonic moiré lattices with Kerr nonlinearity.
    • Light bullet stability is linked to the localization-delocalization transition (LDT) of linear eigenmodes.
    • Aperiodic moiré lattices support stable light bullets above the LDT threshold without an energy threshold.
    • Periodic moiré lattices require a minimum energy threshold for stable light bullet formation.
    • Lattice periodicity (aperiodic vs. periodic) is a critical factor for nonlinear 3D state stability.

    Conclusions:

    • Photonic moiré lattices provide a platform for generating stable 3D light bullets.
    • The transition from delocalized to localized eigenmodes dictates the stability of nonlinear light states.
    • Tailoring moiré lattice properties, specifically periodicity, is key to controlling light bullet characteristics.