Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.23: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Photon emission from the tunneling contact of a low temperature STM for pristine and adsorbate covered metal substrates — •Ebru Özen, Maren C. Cottin, Tobias Roos, Detlef Utzat, Doris Steeger, Willy Platz, Rolf Möller, and Christian A. Bobisch — Faculty of Physics, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany
STM-induced light emission (STM-LE) has been a emerging field in scanning tunneling microscopy in the past years [1]. STM-LE experiments on organic molecules are of particular interest, since they can provide information about energy loss in certain organic molecules [2]. We find that Ag(111) terraces show a plasmonic excitation in the tunneling contact of a silver covered Pt-Ir tip for positive and negative sample bias. In addition experiments on Ag(111) surfaces partially covered by different organic molecules were performed. It is found that the organic molecules perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA), copper-phthalocyanine (CuPc) and the carbon-molecule C60 reduce or completely suppress the emission of photons. Photon maps of molecularly resolved C60 islands show a periodic modulation of the light intensity by the adsorbed C60.
[1] R. Berndt and J. K. Gimzewski, Phys. Rev. B 48 4746 (1993).
[2] C. Chen et al., Phys. Rev. Lett. 105, 217402 (2010).