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Feiyan Zhao1, Xiaoxi Xu1, Hexiang He1

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Stable compound solitons were achieved in a 3D quasi-phase-matched photonic crystal. These novel solitons, exhibiting specific checkerboard structures, demonstrate enhanced stability compared to those in uniform media.

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Area of Science:

  • Nonlinear optics
  • Condensed matter physics
  • Materials science

Background:

  • Quadratic (χ(2)) nonlinear photonic crystals support complex optical phenomena.
  • Stable self-trapped light states (solitons) are crucial for optical signal processing.
  • Vortex solitons in uniform nonlinear media often suffer from instability.

Purpose of the Study:

  • To investigate stable compound solitons in a 3D quasi-phase-matched photonic crystal.
  • To explore the impact of a checkerboard structure on soliton stability.
  • To identify conditions for experimentally realizing these novel optical solitons.

Main Methods:

  • Theoretical modeling of light propagation in a 3D photonic crystal with quadratic nonlinearity.
  • Numerical simulations to identify soliton solutions and analyze their stability.
  • Parametric analysis of soliton stability regions within the checkerboard structure.

Main Results:

  • Solutions for stable compound solitons in a 3D quasi-phase-matched photonic crystal were found.
  • Solitons were characterized as four-peak vortex modes of rhombus and square configurations.
  • Rhombus-shaped solitons demonstrated a broader stability domain compared to square ones.

Conclusions:

  • Checkerboard photonic crystals offer a pathway to stable compound solitons.
  • The identified soliton configurations provide a promising avenue for advanced optical applications.
  • Experimental realization of these stable solitons is feasible with current technology.