Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 26: Plasmonics and nanooptics: Fabrication, characterization and applications – Poster

O 26.2: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Toward Plasmonic Pump-Probe Spectroscopy of a Hot-Electron-Driven Reduction Reaction — •Marcel Schalling, Lukas Schmidt, Ferdinand Bauer, Thorsten Schumacher, and Markus Lippitz — University of Bayreuth

Plasmon-induced hot electrons offer a promising way to drive surface-catalytic chemical reactions with enhanced efficiency and selectivity. We want to follow the dynamics of the hot carriers by pump-probe spectroscopy.
In our approach, an initial laser pulse excites surface plasmons in the gold taper, generating hot electrons. These subsequently reduce adsorbed metal complexes on the taper’s surface. This reduction is expected to locally modify the refractive index, which we probe by a second laser pulse. We show our first steps towards this goal. We start from the opto-electrochemical model system of methylene blue, and gradually add plasmonics and hot-electron generation towards the full implementation of the plasmonic pump-probe concept.

Keywords: Hot Electrons; Surface Plasmons; Plasmon Chemistry; Plasmonics