Less Light, more Insight? New Scattering Mechanism in Dielectric Waveguides and Fibers
Tuesday, 18 Jun. 2013, 15:00 - 16:00
Presenter: Dipl.-Phys. Otto Dietz, Institut für Physik, Humboldt-Universität zu Berlin, Germany
Host: P. Walther
Where: Schrödinger-Zimmer, 4th Floor, Boltzmanngasse 5, 1090 Wien
The coherent scattering through systems with surface roughness is a ubiquitous phenomenon which occurs on vastly different length and time scales. The effects induced by surface scattering often are the key for the understanding both of natural phenomena, like the scattering of underwater waves at a rough ocean seabed, as well as of man-made devices like optical fibers and waveguides. The understanding of all these systems rests on a predictive surface scattering theory that relates the properties of a rough surface to the transport characteristics of the corresponding device and vice versa.
Unfortunately conventional surface scattering theories for the coherent transport through waveguides lack significant ingredients. They do not offer an analytical connection between the boundary roughness and the transport properties. It is this important missing link that has been provided in terms of an analytical surface scattering theory [1, 2]. Its main result is the identification of a theoretically predicted scattering mechanism. In prior work the theory has been tested experimentally for microwave waveguides featuring hard, metallic walls . The experiments confirmed the existence of the predicted scattering mechanism. Thus, a burning question is: Is this scattering mechanism universal? In other words: Does it affect acoustic, phononic, electric and photonic systems as well? Does the theory provide a new level of insight and understanding of transport phenomena in a wide range of different systems? We investigated these questions for dielectric waveguides.
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 O. Dietz, H.-J. Stockmann, U. Kuhl, F. M. Izrailev, N. M. Makarov, J. Doppler, F. Libisch, and S. Rotter, Phys. Rev. B 86, 201106 (2012).