Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 90: Sensing, Active Structures and other Applications
O 90.4: Vortrag
Donnerstag, 19. März 2015, 15:45–16:00, MA 144
Tunable and switchable thin film Faraday rotation in magnetoplasmonic waveguides: experiments and coupled oscillator model — •Dominik Floess1, Thomas Weiss1, Sergei Tikhodeev2, and Harald Giessen1 — 14th Physics Insitute and Research Centre SCOPE, University of Stuttgart, 70569 Stuttgart, Germany — 2A. M. Prokhorov General Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia
A static magnetic field can alter the optical response of materials. For instance, an external magnetic field is capable of changing the rotation of polarization by a layer of magneto-optical material, which is termed Faraday effect in transmission geometry and polar Kerr effect in reflection geometry. Faraday rotators are of high practical interest because of their application in magnetic field sensing, optical modulation and, most importantly, as core elements in optical isolation devices. The highly demanded miniaturization of such devices is usually limited by insufficient rotation capabilities of available magneto-optical materials. We experimentally and theoretically demonstrate the enhancement of thin-film Faraday rotation in EuSe-Au nanostructures exhibiting waveguide-plasmon-polaritons. A rotation tuning range of 8.4 deg is achieved for magnetic fields of 5 T at 30 K. The waveguide material EuSe provides strong magnetooptical response and simple fabrication which is desirable for further studies in the emerging field of magnetoplasmonics. Using a classical harmonic oscillator model, we are able to obtain profound understanding of the magneto-optical response of the hybrid structures.