Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 13: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I

O 13.8: Talk

Monday, March 12, 2018, 17:00–17:15, MA 041

Anomalous Kerr effect in hybrid Bi-YIG/Au magneto-plasmonic nanostructures — •Spiridon D. Pappas, Philipp Lang, and Evangelos Th. Papaioannou — Fachbereich Physik und Landesforschungszentrum OPTIMAS, Technische Universität, 67663 Kaiserslautern, Germany

The magneto-optical effects exhibited by ferromagnetic materials can be enhanced by the strong localization of light, enabled by adjacent plasmonic resonances [1,2]. In this work, we reveal the anomalous enhancement of the longitudinal magneto-optical Kerr effect (L-MOKE) in the ferrimagnetic dielectric bismuth substituted yttrium iron garnet (Bi-YIG), induced by localized surface plasmons (LSPs) in gold nanoparticles (AuNPs). In order to reveal the resonant frequency of the LSPs, we used optical spectrophotometry. A Bi-YIG sample containing no nanoparticles was also used as a reference. The magneto-plasmonic response was studied with the aid of a spectroscopic MOKE setup operating in the longitudinal mode, equipped with a filtered supercontinuum laser source. The experimental results reveal an anomalous enhancement of the L-MOKE signal (Kerr rotation, Kerr ellipticity) for the sample containing AuNPs close to the LSP resonances. In order to gain qualitative insight into the mechanism of the exhibited anomalous L-MOKE, the Near Field enhancement close to the LSP frequencies was simulated computationally.

[1] V. I. Belotelov et al., Nat. Nanotechnol. 6, 370 (2011).

[2] M. Rollinger et al., Nano Lett. 16, 2432 (2016).