Regensburg 2019 – wissenschaftliches Programm
O 64.10: Poster
Mittwoch, 3. April 2019, 17:45–20:00, Poster B1
Revealing the magneto-plasmonic enhancement in Bi:YIG/Au hybrid nanostructures — Spyridon Pappas and •Evangelos Papaioannou — Department of Physics, TU Kaiserslautern
Magnetoplasmonics allows to explore the influence of the strong localization of light, enabled by resonant plasmonic structures, on the response of magneto-optically active adjacent materials. In this work, we demonstrate experimentally the anomalous enhancement of the longitudinal magneto-optic Kerr effect of bismuth substituted yttrium iron garnet films, induced by localized surface plasmons in embedded gold nanoparticles. Additionally, we reveal the underlying mesoscopic nanoscopic near-field mechanism. In order to gain insight into the exact origin of the anomalous magneto-optic response of the hybrid metastructure, we performed far-field simulations, as well as near-field analysis. The far-field simulations reproduce very well the features of the magneto-optic response in the spectral vicinity of the relevant plasmonic resonances. The near-field studies reveal an enhancement of the purely magneto-optically induced field at a spectral position, which correlates with the lateral dimensions of the nanoparticles, and is different from the spectral position of the main plasmon resonance. The exact correlation of the origin of the plasmon-induced effects on the properties of the adjacent magneto-optic materials, as well as the near-field mapping of the enhanced polarization conversion efficiency, can have a high impact on the engineering of hybrid magneto-plasmonic metastructures.