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APS » Journals » Phys. Rev. Lett. » Volume 97 » Issue 8
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Phys. Rev. Lett. 97, 083901 (2006) [4 pages]

Observation of Surface Gap Solitons in Semi-Infinite Waveguide Arrays

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Christian R. Rosberg1, Dragomir N. Neshev1, Wieslaw Krolikowski2, Arnan Mitchell3, Rodrigo A. Vicencio4, Mario I. Molina5, and Yuri S. Kivshar1
1Nonlinear Physics Centre, Centre for Ultrahigh-Bandwidth Devices for Optical Systems (CUDOS), Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australia
2Laser Physics Centre, Centre for Ultrahigh-Bandwidth Devices for Optical Systems (CUDOS), Research School of Physical Sciences and Engineering, Australian National University, Canberra, Australia
3School of Electrical and Computer Systems Engineering, RMIT University, Melbourne, Australia
4Max-Planck-Institut für Physik Komplexer Systeme, Dresden, Germany
5Departamento de Física, Facultad de Ciencias, Universidad de Chile, Santiago, Chile

Received 24 March 2006; published 23 August 2006

We report on the observation of surface gap solitons found to exist at the interface between uniform and periodic dielectric media with defocusing nonlinearity. We demonstrate strong self-trapping at the edge of a LiNbO3 waveguide array and the formation of staggered surface solitons with propagation constant inside the first photonic band gap. We study the crossover between linear repulsion and nonlinear attraction at the surface, revealing the mechanism of nonlinearity-mediated stabilization of the surface gap modes.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.083901
DOI:
10.1103/PhysRevLett.97.083901
PACS:
42.65.Tg, 42.65.Sf, 42.65.Wi
 
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