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O: Fachverband Oberflächenphysik
O 58: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy I
O 58.5: Talk
Wednesday, March 29, 2023, 16:15–16:30, WIL A317
Observation of multi-quantum phenomena in molecular films strongly coupled to surface plasmons using ultrafast laser spectroscopy — •Simon Büttner1, Matthias Hensen1, Katja Mayershofer1, Maximilian Rödel2, Jens Pflaum2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Experimental Physics VI, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
Multi-quantum phenomena such as exciton–exciton annihilation can be used to study exciton diffusion [1], which is a key process in optoelectronic devices like solar cells. Recently, our group has developed a method to isolate different multi-quantum signals using transient absorption (TA) spectroscopy. This novel method makes it possible to filter out the interaction of a distinct number of quasiparticles and their time evolution. Here, we use this method together with a new ultrafast laser setup that allows us to shape and detect femtosecond laser pulses at a repetition rate of 100 kHz. As a model system we investigate a thin Zinc phthalocyanine (ZnPc) film on a surface-plasmon-supporting gold substrate. Strong coupling between ZnPc excitons and surface plasmons leads to the formation of plexcitons [2], and thus to a delocalization of charge carriers, which is of particular interest for increasing charge carrier mobilities. In this work we focus on the influence of the strong coupling on the quasiparticle diffusion.
[1] P. Malý et al., Chem. Sci. 11, 456 (2020)
[2] M. Rödel et al., J. Phys. Chem. C 126, 4163-4171 (2022)