Frankfurt 2006 – scientific programme
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SYRT: Radiation transport in random media
SYRT 1: Radiation transport in random media I
SYRT 1.4: Invited Talk
Friday, March 17, 2006, 12:30–13:00, HVI
Propagation of light in disordered fiber bundles — •Ulf Peschel1, Thomas Pertsch2, Falk Lederer3, Jens Kobelke4, Kay Schuster4, Hartmut Bartelt4, Stefan Nolte2, and Andreas Tünnermann2 — 1Institut für Optik, Information und Photonik, Universität Erlangen, D-91058 Erlangen, Germany — 2Institut für Festkörpertheorie und Theoretische Optik, Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany — 3Institut für angewandte Physik, Friedrich-Schiller-Universität Jena, D-07743 Jena, Germany — 4Institut für Physikalische Hochtechnologie e.V, D-07745 Jena, Germany
We experimentally study the propagation of light in a distorted bundle of coupled optical fibers. Monitoring the field evolution in the fibers we find coherent interaction to turn over into diffusive spreading due to the presence of disorder. Parts of the propagating field even remain trapped in certain areas of the array. Increasing the power we cause the nonlinearity to successfully compete with the action of disorder. The diffusive propagation of linear fields is nonlinearly modified resulting in power controlled localization. In contrast, fields which remain trapped in the low power case, start to propagate and spread due to the action of the nonlinearity. Experimental results are compared with numerical simulations and good agreement is obtained.