Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Plasmonics and Nanooptics II
O 19.12: Vortrag
Montag, 11. März 2013, 18:45–19:00, H31
Nonreciprocal Plasmonics: Thin Film Faraday Rotator — •Jessie Chin1, Tobias Steinle1, Thomas Wehlus2, Thomas Weiss1, Daniel Dregely1, Vladimir Belotelov3, Bernd Stritzker2, and Harald Giessen1 — 14th Physics Institute and Research Center SCOPE, University of Stuttgart, 70569 Stuttgart, Germany — 2Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 3Lomonosov Moscow State University, Faculty of Physics, 119991 Moscow, Russia
Light propagation is usually reciprocal. However, a static magnetic field along the propagation direction can break the time-reversal symmetry in the presence of magneto-optical (MO) materials. The Faraday effect in this material rotates the polarization plane of light, and when light travels backward the polarization is further rotated. It is an important MO effect due to its crucial application in optical isolation. Thin film optical isolators and the enhancement of the MO Faraday effect are of particular interest due to the demand in integrated optics. We report large enhancement of thin film Faraday rotation by a sophisticated plasmonic system hybridized with nonreciprocal MO materials. We present experimental enhancement of Faraday rotation up to one order of magnitude by plasmonics. The enhanced Faraday rotation is accompanied by high transparency, which is favorable for potential applications. Numerical simulations agree very well with the measurement results and explain the mechanism of the enhancement. Our magneto-plasmonic system can be further engineered and may lead to ultracompact device applications in optical systems.