Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Plasmonics and Nanooptics IV

O 79.5: Vortrag

Donnerstag, 3. April 2014, 17:00–17:15, TRE Ma

Angular resolved electron energy-loss spectroscopy on plasmonic nanostructures — •Felix von Cube^1,2,3, Jens Niegemann⁴, Stephan Irsen², David C. Bell³, and Stefan Linden¹ — ¹Physikalisches Institut, Universität Bonn, 53115 Bonn, Germany — ²Electron Microscopy and Analytics (EMA), Center of Advanced European Studies and Research (caesar), 53175 Bonn, Germany — ³School of Engineering and Applied Sciences, Harvard University, Cambridge MA 02138, USA — ⁴Laboratory for Electromagnetic Fields (IFH), ETH Zurich, 8092 Zurich, Switzerland

We investigate the plasmonic near-field of a lithographically defined metallic nanostructure with angular resolved electron energy-loss spectroscopy in a scanning transmission electron microscope. By tilting the sample, different electric field components of the plasmonic modes can be probed with the electron beam. The electron energy-loss spectra recorded under oblique incidence can feature plasmonic resonances that are not observable under normal incidence. Our experimental findings are reproduced by full numerical calculations based on the discontinuous Galerkin time-domain method.