Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 76: Nanophotonics II

Q 76.7: Talk

Friday, March 14, 2025, 16:00–16:15, WP-HS

Transient energy distributions for photo-catalysis in plasmonic heterostructures — •Mathis Noell, Felix Stete, Matias Bargheer, and Carsten Henkel — Universität Potsdam, Institut für Physik und Astronomie

We investigate the dynamics of heat energy transfer following photon absorption by a gold palladium core-shell nanoparticle. This hybrid structure combines a highly efficient plasmonic antenna with catalytically active material, making it a promising platform for light energy harvesting in view of light-driven catalysis. We analyze energy dissipation after single-photon absorption and sequences of photon pulses, bridging towards continuous-wave irradiation via stochastic Markov chains of individual absorption events. Employing two- and three-temperature models, we track the transient energy flow and demonstrate that the Pd shell, due to its strong electron-phonon coupling, momentarily reaches the highest local energy density. The influence of interfacial thermal conductivity and coupling to the surrounding medium is also evaluated.

Keywords: Plasmonic; single photon absorption; transient energy distribution