Phase Transition in Multimode Nonlinear Parity-Time-Symmetric Waveguide Couplers

Abstract

Parity-time-symmetric (PT-symmetric) optical waveguide couplers offer new possibilities for fast, ultracompact, configurable, all-optical signal processing. Here, we study nonlinear properties of finite-size multimode PT-symmetric couplers and predict the nonlinear oscillatory dynamics that can be controlled by three parameters: input light intensity, gain and loss amplitude, and input beam profile.Moreover, we show that this dynamics is driven by a PT transition triggered by nonlinearity in these structures, and we demonstrate that with the increase of the number of dimers in the system, the transition threshold decreases and converges to the value corresponding to an infinite array. Finally, we present a variety of periodic intensity patterns that can be formed in these couplers depending on the initial excitation.

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Document Details

Document Type
Technical Report
Publication Date
Feb 02, 2016
Accession Number
AD1068809

Entities

People

  • Natalia M. Litchinitser
  • Wiktor Walasik

Organizations

  • University at Buffalo

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Amplitude
  • Communication Systems
  • Crystal Lattices
  • Dielectric Permittivity
  • Electrical Engineering
  • Energy Transfer
  • Equations
  • Frequency
  • Materials
  • New York
  • Nonlinear Dynamics
  • Optical Lattices
  • Optical Waveguides
  • Phase Transformations
  • Signal Processing
  • Waveguide Couplers
  • Waveguides

Fields of Study

  • Physics

Readers

  • Optical Physics and Photonics.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.