Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 86: Plasmonics and Nanooptics VI

O 86.2: Talk

Friday, March 15, 2013, 10:45–11:00, H36

Plasmon-induced fluorescence and electroluminescence from porphine molecules on GaAs(110) in a scanning tunneling microscope — •Svenja Mühlenberend, Natalia L. Schneider, Markus Gruyters, and Richard Berndt — Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany

An STM tip can be used to excite luminescence from atomic scale structures. For the investigation of molecular fluorescence, however, the coupling to metallic substrates has been a major issue as it largely inhibits fluorescence. The decoupling of molecules by e.g. multilayer arrangements or salt layers has been used to circumvent this difficulty. Here, we report on fluorescence from tetraphenyl-porphine molecules on a semiconductor (GaAs(110)) for very low coverages of less than 5% of a monolayer without any decoupling layer. Evidence for intramolecular Q-band transitions is found in the fluorescence spectra. The processes involved in exciting this molecular fluorescence will be discussed.