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.
M. Koirala et al., "Critical States Embedded in the Continuum," CLEO: QELS - Fundamental Science, CLEO_QELS 2015, Optical Society of America (OSA), May 2015.
The definitive version is available at http://dx.doi.org/10.1364/CLEO_QELS.2015.FW3C.2
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)
Article - Conference proceedings
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