Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Plasmonics and Nanooptics I: Local Probes and Raman (joint session O/CPP)

CPP 16.6: Talk

Monday, March 16, 2020, 11:45–12:00, WIL A317

Single-molecule vibrational signature and redox-states probed with STM-Induced Fluorescence Microscopy — •Benjamin Doppagne, Michael C. Chong, Etienne Lorchat, Stephane Berciaud, Michelangelo Romeo, Hervé Bulou, Alex Boeglin, Fabrice Scheurer, and Guillaume Schull — Institut de Physique et Chimie des Matérieux de Strasbourg, 67034 Strasbourg, France

Infrared, Raman and fluorescence spectroscopies are powerful methods to obtain precise information regarding the chemical structure or environment of an organic system. In this presentation, I report the use of a STM to obtain the fluorescence spectrum of a single Zinc-Phthalocyanine molecule, to go beyond the limitations commonly observed in conventional optical techniques. We have shown that in such configuration, it is possible to obtain optically an accurate vibrational signature of the probed molecule with a sub-molecular resolution, without light excitation. This technique has allowed us to obtain, for the first time, the fluorescence spectrum of a charged single molecule. Comparison between fluorescence spectra of the neutral and the charged species shows that these latters exhibit different vibrational signatures. Thanks to this identification, we performed a complete optical monitoring of the redox state of a single molecule with STM-Induced Fluorescence Microscopy.