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O: Fachverband Oberflächenphysik
O 66: Poster: Nanostructures at Surfaces
O 66.8: Poster
Mittwoch, 20. März 2024, 18:00–20:00, Poster C
Photoinduced dynamics of plasmonic HfN nanodots and thin films — •Marc Herzog1, Maximilian Mattern1, Alexander von Reppert1, Steffen Zeuschner1, Matthias Rössle1, Florin Boariu1, Jan-Etienne Pudell2, Angel Rodriguez-Fernandez2, Wonhyuk Jo2, Anders Madsen2, Sven Askes3, Andrea Baldi3, and Matias Bargheer1,4 — 1Institut für Physik, Universität Potsdam, Germany — 2European XFEL, Germany — 3Vrije Universiteit Amsterdam, Netherlands — 4HZB Berlin, Germany
Metallic nanoparticles can be exploited to focus light energy onto the nm scale where it may trigger specific processes such as chemical reactions. The "gold standard" in nanoplasmonics, i.e. Au nanoparticles, suffers from the superior electron heat conductivity which quickly spreads the absorbed nanofocused energy away from the hot spots. Hafnium nitride (HfN) is a very robust material and its plasmonic properties and large electron-phonon coupling facilitate a light-generated long-lived nanofocusing of heat rendering it a very promising material in plasmon-assisted catalysis.
The knowledge of the local temperature in nanoparticles is critical for a thorough understanding of light-driven nanoscale processes, however, its experimental determination is by no means straightforward. Using ultrafast x-ray diffraction, we compare the photoinduced coherent and incoherent expansion dynamics of HfN thin films and substrate-supported nanodots. We thereby shed light on the morphology dependence of nanooptical and thermoelastic properties of HfN nanostructures.
Keywords: HfN; Thin films; Nanodots; time-resolved x-ray diffraction; phonons