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Critical States Embedded in the Continuum
CLEO: QELS - Fundamental Science, CLEO_QELS 2015
  • Milan Koirala
  • Alexey Yamilov, Missouri University of Science and Technology
  • A. Basiri
  • Yaron Bromberg
  • Hui Cao
  • Tsampikos Kottos

Weintroduce 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.

Meeting Name
CLEO: QELS - Fundamental Science (2015: May 10-15, San Jose, CA)
Keywords and Phrases
  • Critical State,
  • Hermitians,
  • Optical Waveguide Arrays,
  • Optical Waveguides
International Standard Book Number (ISBN)
Document Type
Article - Conference proceedings
Document Version
Final Version
File Type
© 2015 Optical Society of America (OSA), All rights reserved.
Publication Date
Citation Information
Milan Koirala, Alexey Yamilov, A. Basiri, Yaron Bromberg, et al.. "Critical States Embedded in the Continuum" CLEO: QELS - Fundamental Science, CLEO_QELS 2015 (2015)
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