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Dissipative defect modes in periodic structures.

Yaroslav V Kartashov1, Vladimir V Konotop, Victor A Vysloukh

  • 1ICFO-Institut de Ciencies Fotoniques, Universitat Politecnica de Catalunya, Mediterranean Technology Park,08860 Castelldefels (Barcelona), Spain.

Optics Letters
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Summary
This summary is machine-generated.

Stable dissipative defect modes were found in nonlinear optical lattices with gain and loss. These modes, with one or two humps, are controlled by the lattice properties and gain-loss balance.

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Area of Science:

  • Nonlinear optics
  • Photonics
  • Condensed matter physics

Background:

  • Optical lattices are periodic structures used to control light propagation.
  • Nonlinear media introduce intensity-dependent effects.
  • Dissipative systems involve energy exchange with the environment.

Purpose of the Study:

  • To investigate the existence and properties of stable dissipative defect modes in nonlinear optical lattices.
  • To explore the influence of gain and loss on these modes.
  • To understand the role of lattice parameters and propagation constants.

Main Methods:

  • Theoretical modeling of light propagation in nonlinear optical lattices.
  • Numerical simulations to identify and characterize defect modes.
  • Analysis of the spectral properties and stability of the obtained modes.

Main Results:

  • Stable dissipative defect modes were observed in both focusing and defocusing nonlinear media.
  • The shapes and transverse extent of the modes are governed by the propagation constant within a spectral gap.
  • The balance between linear gain and two-photon absorption loss dictates the mode characteristics.
  • Both one-hump and two-hump defect modes were successfully obtained.

Conclusions:

  • Periodic optical lattices with engineered gain and loss can support robust dissipative defect modes.
  • These modes offer potential for novel optical functionalities and light manipulation.
  • The findings provide a deeper understanding of light-matter interactions in complex optical systems.