Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 19: Plasmonics and Nanooptics II

O 19.2: Talk

Monday, March 11, 2013, 16:15–16:30, H31

Hybrid waveguide-particle-plasmon-polaritons enhance transverse magneto-optical Kerr effect — •Lars E. Kreilkamp¹, Vladimir I. Belotelov², Ilya A. Akimov¹, Manfred Bayer¹, Thomas Wehlus³, Bernd Stritzker³, Jessie Chin⁴, Stefanie Neutzner⁴, Daniel Dregely⁴, and Harald Giessen⁴ — ¹Experimental Physics 2, TU Dortmund University, D-44221 Dortmund, Germany — ²A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, 119992 Moscow, Russia — ³Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — ⁴4th Physics Institute and Research Center SCoPE, University of Stuttgart, D-70569 Stuttgart, Germany

We demonstrate an enhanced transverse magneto-optical Kerr effect (TMOKE) at the optical resonance of a hybrid plasmonic structure. Polaritons are formed by the interaction of particle plasmons in gold nanowires in combination with a slab waveguide mode of the magneto-optical material bismuth iron garnet. A large TMOKE modulates the intensity of a transmitted beam by 1.5% upon switching the magnetization direction. This enhancement of TMOKE is explained by considering a waveguide-particle-plasmon resonance, which shifts and changes its shape upon magnetization flipping and hence leads to a large transmission contrast, in combination with a simultaneously high transmittance. The experimental results are compared to electromagnetic modelling of transmission and TMOKE spectra based on the Rigorous Coupled-Wave Analysis. The influence of surface roughness on the obtainable figure of merit is discussed.