Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.26: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Polarization dependence of electron emission from cross-shaped nanoantennas — •Peter Klaer1, Keno Krewer1, Florian Schertz1, Gerhard Schönhense1, Hans-Joachim Elmers1, Xiaofei Wu2, and Bert Hecht2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, 55122 Mainz — 2Institut für Physik, Julius-Maximillians Universität Würzburg, 97074 Würzburg
Cross shaped nanoantennas that are designed to carry angular momentum have been fabricated by focused ion beam on single-crystalline gold flake. We show that these nanoantennas can be resonantly excited by femtosecond laser pulses using the emitted electron intensity from individual antennas, as determined by a photoemission electron microscope, as a measure for the plasmonic field enhancement. The resonant wavelength scales with the size of the antennas. The sample is illuminated from the front side at grazing incidence and from the backside at normal incidence. In both geometries the photoemission intensity of some antennas shows an unexpectedly pronounced polarization dependence, which can be explained by the actual shape of the nanoantennas.