SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Poster: Scanning Probe Techniques
O 21.5: Poster
Montag, 27. März 2023, 18:00–20:00, P2/EG
Electromagnetic Field Mapping in Plasmonic Nanostructures using Momentum-Resolved Electron Energy-loss Spectroscopy — •Johannes Schultz1, Jonas Krehl1, Giulio Guzzinati2, and Axel Lubk1,3 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e. V., Helmholtzstraße 20, 01069 Dresden — 2EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp — 3Institute of Solid State and Materials Physics, Haeckelstraße 3, 01069 Dresden
Localized surface plasmons (LSPs) are collective oscillations of charge carriers arising at interfaces between media of opposite sign of the dielectric functions. Here, spatial confinement of the LSPs, e.g. in nanoparticles (NPs), may lead to enhanced electromagnetic (e.m.) fields of the LSPs due to resonance. This effect is exploited in several application, e.g., surface enhanced Raman spectroscopy. To characterize the e.m. fields scanning transmission electron microscopy in combination with electron energy loss spectroscopy is a frequently used technique due to its high spectral and spatial resolution. Here, the energy loss of the beam electrons (caused by the electric field component of the LSPs parallel to the beam) is measured at different probe positions. This technique has been generalized to additionally probe in-plane field components by measuring the deflection of the beam electrons from their initial trajectory. To that end spectrally resolved deflection maps (so-called ω−q maps) are recorded at different probe positions which opens up new capabilities to e.g., probe magnetic field contributions of the LSPs at highest spectral and spatial resolution.