Observation of two-dimensional defect surface solitons

Institute of Applied Physics, Friedrich-Schiller-Universität Jena, Jena, Germany.
Optics Letters (Impact Factor: 3.29). 04/2009; 34(6):797-9. DOI: 10.1364/OL.34.000797
Source: PubMed


We report on the experimental observation of two-dimensional solitons located in defect channels at the surface of a hexagonal waveguide array. The threshold power for the excitation of solitons existing owing to total internal reflection grows with decrease of the refractive index in negative defects and vanishes for sufficiently strong positive defects. Negative defects can also support linear surface modes existing owing to Bragg-type reflections.

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    • "In analogy to conventional defects formed by detuned waveguides, which have been the subject of detailed investigations in recent years (see e.g. [5]–[8]), junctions act as perturbations to the periodicity of the waveguide array and, consequently, can be perceived as so-called topological defects [9]. As proposed in [10] for kinks (junctions with two oblique branches), the similarity between topological and conventional defects may be employed e.g. to mitigate reflections by introducing an appropriate detuning at the pivotal guide [11]. "
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