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<p>We propose a scheme for generating stable vortex solitons (VSs) in a quadratic nonlinear medium featuring a moiré photonic crystal. The photonic crystal is constructed by combining a three-dimensional (3D) checkerboard structure for quasi-phase-matching (QPM) with a transversely imposed moiré linear photonic lattice. Numerical simulations, based on solving the nonlinear Schrödinger equation via the imaginary-time evolution method, demonstrate the existence of stable two-dimensional (2D) four-core VSs carrying topological charges up to 2. Their stability is confirmed through high fidelity during propagation evolution. A key finding is that the moiré lattice potential profoundly enhances the localization of these VSs compared to systems with pure quadratic nonlinearity. Quasi-steady morphological transformations of VSs can be achieved by tuning the moiré potential strength and power of VSs. The results in this tunable moiré-QPM system hold significant promise for applications in topological photonics, all-optical information processing, and optical data transmission.</p>

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Vortex solitons in quasi-phase-matched quadratic nonlinearity media with moiré photonic crystals

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Linjia Wang,
  • Zhufeng Zhu,
  • Jiajun Zhou,
  • Zishun Liao,
  • Guowei Chen,
  • Yuan Zhao,
  • Zhuo Fan,
  • Di Wu,
  • Siliu Xu

摘要

We propose a scheme for generating stable vortex solitons (VSs) in a quadratic nonlinear medium featuring a moiré photonic crystal. The photonic crystal is constructed by combining a three-dimensional (3D) checkerboard structure for quasi-phase-matching (QPM) with a transversely imposed moiré linear photonic lattice. Numerical simulations, based on solving the nonlinear Schrödinger equation via the imaginary-time evolution method, demonstrate the existence of stable two-dimensional (2D) four-core VSs carrying topological charges up to 2. Their stability is confirmed through high fidelity during propagation evolution. A key finding is that the moiré lattice potential profoundly enhances the localization of these VSs compared to systems with pure quadratic nonlinearity. Quasi-steady morphological transformations of VSs can be achieved by tuning the moiré potential strength and power of VSs. The results in this tunable moiré-QPM system hold significant promise for applications in topological photonics, all-optical information processing, and optical data transmission.