Critical States Embedded in the Continuum

Abstract

We introduce a class of critical states which are embedded in the continuum (CSC) of a one-dimensional optical waveguide array with one non-Hermitian defect. These states are on the verge of being fractal and have real propagation constants. They emerge at a phase transition which is driven by the imaginary refractive index of the defective waveguide and it is accompanied by a mode segregation which reveals analogies with the Dicke super-radiance. Below this point the states are extended while above it they evolve to exponentially localized modes. An addition of a background gain or loss can turn these localized states into bound states in the continuum.

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Document Details

Document Type
Technical Report
Publication Date
Jun 10, 2014
Accession Number
AD1141558

Entities

People

  • A. Basiri
  • Alexey Yamilov
  • H. Cao
  • M. Koirala
  • T. Kottos
  • Y. Bromberg

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Band Spectra
  • Band Structures
  • Eigenvalues
  • Energy Bands
  • Equations
  • Greens Functions
  • Materials
  • Optical Lattices
  • Optical Waveguides
  • Perturbation Theory
  • Perturbations
  • Phase Transformations
  • Photonic Devices
  • Physics
  • Quantum Mechanics
  • Quantum Optics
  • Radiance
  • Refractive Index
  • Transitions
  • Waveguides

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Materials Science and Engineering.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.