Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.45: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Electroluminescence in STM junction: nanostructures on Cu(3)N insulating layer — •Anna Strozecka, Jingcheng Li, Gunnar Schulze, Martina Corso, Katharina J. Franke, and Jose I. Pascual — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin

Photons emitted in a scanning tunneling microscope (STM) junction can provide rich information about the electronic structure of investigated systems. However, on metal surfaces the light emission spectra are usually dominated by plasmonic excitations of the tip-sample cavity and the direct optical transitions are strongly quenched due to the short lifetime of the involved resonances. The decoupling from the metal support is neccessary in order to observe light emission directly from the nanostructure. Our experiments aim at getting closer insight into the coupling between plasmonic and electronic degrees of freedom in such systems. We investigated different types of nanostructures grown on Cu(3)N insulating layer on Cu(110). In three-dimensional Cu(3)N nanocrystals the narrow resonances corresponding to localized images potential states give rise to a direct optical transition. We studied also light emitted from molecules supported on a single Cu(3)N layer. The resulting spectra show that the molecular fluorescence is mediated by the plasmonic excitations in the cavity. Depending on the molecular structure we observe enhancement or quenching of the light emission.