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Rotating vortex solitons supported by localized gain.

Olga V Borovkova1, Valery E Lobanov, Yaroslav V Kartashov

  • 1ICFO-Institut de Ciencies Fotoniques, and Universitat Politecnica de Catalunya, Mediterranean Technology Park, 08860, Castelldefels, Barcelona, Spain. Olga.Borovkova@icfo.es

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Summary
This summary is machine-generated.

New stable vortex solitons with multiple nested phase singularities were discovered in nonlinear optical media. Their rotation is governed by gain strength and nonlinear absorption.

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Area of Science:

  • Nonlinear Optics
  • Optical Solitons
  • Physics of Light

Background:

  • Cubic (Kerr) nonlinear media are fundamental for studying light propagation.
  • Two-photon absorption introduces significant energy dissipation and nonlinear effects.
  • Vortex solitons, characterized by phase singularities, are crucial in nonlinear optics.

Purpose of the Study:

  • To investigate the existence and stability of novel higher-order vortex solitons.
  • To explore the dynamics of phase singularities within these solitons.
  • To understand the influence of localized gain and nonlinear absorption on soliton behavior.

Main Methods:

  • Numerical simulations of light propagation in a focusing cubic nonlinear medium.
  • Imprinting of ringlike localized gain landscapes.
  • Inclusion of strong two-photon absorption in the model.

Main Results:

  • Demonstrated the formation of stable higher-order vortex solitons with multiple nested phase singularities.
  • Observed rotation of phase singularities around the gain landscape's center.
  • Established a direct relationship between rotation period, gain strength, and nonlinear absorption.

Conclusions:

  • Localized gain and two-photon absorption enable new types of stable vortex solitons.
  • The dynamics of nested phase singularities are controllable via gain and absorption parameters.
  • This work expands the understanding of complex light structures in nonlinear media.