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O: Fachverband Oberflächenphysik
O 72: Poster Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy
O 72.2: Poster
Mittwoch, 19. März 2025, 18:00–20:00, P2
Comprehensive Probing of Electron and Phonon Systems by Raman Scattering — •Jan Kutschera1, Marc Herzog1, Wouter Koopman1, Felix Stete1, and Matias Bargheer1,2 — 1Institut für Physik & Astronomie, Universität Potsdam, Potsdam, Deutschland — 2Helmholtz Zentrum Berlin, Berlin, Deutschland
Inelastic processes in light-matter interactions are crucial for understanding energy transport within solid-state materials, where energy is distributed between electron and phonon systems. Investigating these interactions provides deeper insights into fundamental processes relevant to plasmonics, optoelectronics, and optoacoustics. However, knowledge about the energy transfer dynamics within each system is also essential for a complete picture. By extending Raman spectroscopy to ultrashort timescales, we aim at analyzing the transient population dynamics of phonon modes and the interplay of different electronic bands to ultimately establish ultrafast Raman Spectroscopy which directly probes electron-electron, electron-phonon, and phonon-phonon interactions. Here, we present an intraband emission of the conduction band electrons in gold nanoparticles, which is excited by interband absorption and appears as a continuous background in static Raman experiments. Pump-probe experiments can help further examine the origin of this emission and the interaction of different electronic subsystems. Moreover, we investigate the phonon modes of HfN and other materials as potential candidates for the catalysis of light-driven reactions.
Keywords: Raman; Auger; phonon; electron; energy transfer