Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Topical Session: TEM-Symposium - HR Imaging & Analytic II
MM 21.4: Topical Talk
Dienstag, 12. März 2013, 12:30–13:00, H4
Surface plasmon coupling studies through near-field mapping of electromagnetic modes in electron microscopy — Burcu Ögüt1, Nahid Talebi1, Wilfried Sigle1, Ralf Vogelgesang2, and •Peter A. van Aken1 — 1Stuttgart Center for Electron Microscopy, Max-Planck Institute for Intelligent Systems, Stuttgart, Germany — 2Institut für Physik, Carl von Ossietzky Universität Oldenburg, Oldenburg, Germany
Miniaturization technology in optics has become an emerging field with the aim of overcoming the obstacle of the diffraction limit of light. Plasmons which are coherent collective oscillations of quasi-free electrons in a metal volume or surface provide exciting new options for information transfer in channels smaller than this diffraction limit. This presentation concentrates on different plasmonic phenomena which are observed in a TEM in combination with EELS and EFTEM. Plasmonic coupling behaviour of electromagnetic fields at metallic nano-structures were investigated. The experimental results are cross-checked by different simulation techniques based on discrete dipole approximation, finite element method, and 3D finite-difference time-domain methods unveiling the precise electromagnetic field distribution. The hybridization of electromagnetic fields of closely spaced rectangular nanoslits was analysed in the framework of Babinet*s principle, and the presence of toroidal modes in a metal ring formed by an oligomer of holes was demonstrated for the first time. Resonant wedge plasmon modes in a triangular nanoprism were observed, and symmetry breaking concepts are thoroughly discussed.