Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 92: Nanostructures at surfaces: Dots, particles, clusters I
O 92.9: Vortrag
Donnerstag, 15. März 2018, 12:45–13:00, MA 141
Single-molecule fluorescence excited by a scanning tunnelling microscope — •Jörg Kröger1,2, Benjamin Doppagne2, and Guillaume Schull2 — 1Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany — 2Institut de Physique et Chimie des Matériaux de Strasbourg, F-67034 Strasbourg, France
Ultrathin NaCl films on Ag(111) were used to efficiently decouple the organic electron donor molecule tetraphenyldibenzoperiflanthene (C64H36, DBP) from the metal support and to probe the genuine molecular luminescence. Injecting charge from the tip of a low-temperature scanning tunnelling microscope into DBP leads to photon emission with different quantum yields across the molecule reflecting the presence of a single transition dipole moment. Vibrational progression and hot electroluminescence may be inferred from the photon spectra. By placing the tip in the lateral nanometre vicinity of the molecule light emission is remotely controlled. The spectral line shape of the excited S1—→ S0 transition exhibits a Fano profile whose asymmetry varies with the tip-molecule distance. These data reflect the subtle interplay between the injected charge, the molecular exciton and the plasmonic environment. Financial support by the Deutsche Forschungsgemeinschaft through Grant No. KR 2912/12-1 is acknowledged.