Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy
O 23.12: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
Real-space imaging of nanotip plasmons using electron energy loss spectroscopy — •Benjamin Schröder1, Thorsten Weber2,3, Sergey V. Yalunin1, Thomas Kiel4, Christian Matyssek4, Murat Sivis1, Sascha Schäfer1, Felix von Cube2,3, Stephan Irsen3, Kurt Busch4,5, Sefan Linden2, and Claus Ropers1 — 14th Physical Institute - Solids and Nanostructures, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen — 2Physikalisches Institut, Rheinische Friedrich-Wilhelms-Universität Bonn, Nußallee 12, 53115 Bonn — 3Electron Microscopy and Analytics, center of advanced european studies and research, Ludwig-Erhard-Allee 2, 53175 Bonn — 4Institut für Physik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin — 5Max-Born-Institut, Max-Born-Straße 2A, 12489 Berlin
Surface plasmon polaritons (SPPs) excited on the shaft of sharp metal tips provide electromagnetic field confinement and enhancement at the apex. Here, we study gold nanotips by scanning transmission electron microscopy combined with electron energy loss spectroscopy (STEM-EELS). Using this technique, we observe standing waves of plasmonic modes formed by SPP reflection at the tip apex. We provide a fully retarded model and numerical computations based on a discontinuous Galerkin time domain approach showing excellent agreement with the experimental data. Our results demonstrate a high reflectivity of the apex to the fundamental mode, with negligible contributions of higher order azimuthal SPP modes in the apex-near region[1].
[1] B. Schröder et al., Phys. Rev. B 92, 085411 (2015).