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Observation of Defect States in PT-Symmetric Optical Lattices

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Regensburger,  Alois
Nonlinear Optics and Nanophotonics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Bersch,  Christoph
Optical Communication, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Onishchukov,  Georgy
Optical Communication, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Peschel,  Ulf
Nonlinear Optics and Nanophotonics, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Regensburger, A., Miri, M.-A., Bersch, C., Naeger, J., Onishchukov, G., Christodoulides, D. N., et al. (2013). Observation of Defect States in PT-Symmetric Optical Lattices. PHYSICAL REVIEW LETTERS, 110(22): UNSP 223902. doi:10.1103/PhysRevLett.110.223902.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6765-9
Abstract
We provide the first experimental demonstration of defect states in parity-time (PT) symmetric mesh-periodic potentials. Our results indicate that these localized modes can undergo an abrupt phase transition in spite of the fact that they remain localized in a PT-symmetric periodic environment. Even more intriguing is the possibility of observing a linearly growing radiation emission from such defects provided their eigenvalue is associated with an exceptional point that resides within the continuum part of the spectrum. Localized complex modes existing outside the band-gap regions are also reported along with their evolution dynamics.