Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 9: Plasmonics and Nanooptics I: Local Probes and Raman (joint session O/CPP)

O 9.7: Vortrag

Montag, 16. März 2020, 12:00–12:15, WIL A317

Optical tracking of a tautomerization process with STM-Induced Fluorescence Microscopy — •Benjamin Doppagne1, Tomas Neuman2, Ruben Soria Martinez1, Luis E. Parra Lopez1, Hervé Bulou1, Michelangelo Romeo1, Stephane Berciaud1, Fabrice Scheurer1, Javier Aizpurua2, and Guillaume Schull11Institut de Physique et Chimie des Matérieux de Strasbourg, 67034 Strasbourg, France — 2Center for Materials Physics, San Sebastian 20018, Spain

Optical spectroscopies are powerful techniques to obtain precise information regarding the chemical structure or the environment of organic molecules. Therefore, gathering the optical signal from a single molecule represents the ultimate limit in terms of chemical analysis and provide a way to probe its local environment. In this presentation, I report recent results, where we used a STM to induce fluorescence emission from a single H2Pc molecule. Two different emission lines, which are relative to each tautomer of the molecule are observed in the STM-Induced fluorescence spectrum. Spatial mapping of these fluorescence lines coupled with a theoretical model using the concept of plasmonic picocavity, where the light is confined by the last atoms of the tip within volumes of the order of 1 nm3, allowed us to obtain optical images of the two tautomers. Thanks to this identification, real-time optical tracking of the tautomerization process is carried out, providing the tautomers lifetimes. This result shows that STM-Induced single-molecule fluorescence experiments constitute a complete optical microscopy technique at the atomic scale.

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