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O: Fachverband Oberflächenphysik

O 75: Focus Session: Ultrafast Dynamics in Nanostructures I

O 75.4: Talk

Thursday, March 30, 2023, 11:30–11:45, GER 38

SPP induced coherent electronic excitations investigated by Time- and Angle-Resolved Plasmoemission-Spectroscopy on Cs/Au(111) — •Alexander Neuhaus, Pascal Dreher, David Janoschka, Michael Horn-von Hoegen, and Frank-J. Meyer zu Heringdorf — Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany

Non-perturbative interactions of intense light fields with the electronic band structure in a solid can result in transient electronic properties. The experimental conditions required to realize the necessary field strength can be realized in nano-optical systems, as these can be designed to provide tremendous enhancements of the local field amplitude. Ultimately, observing the non-equilibrium electron dynamics in such systems requires a combination of precise control over the local driving field, state resolution, and spatial selectivity. Here, we explore electron emission from nano-focused femtosecond surface plasmon polariton (SPP) pulses, providing us with deep-subwavelength spatial selectivity. Two-dimensional time- and angle-resolved photoelectron spectroscopy using a birefringent delay line provides us with direct access to the coherent and incoherent dynamics of the electronic excitations with attosecond precision. The technique is applied to the system Cs/Au(111), where we observe SPP induced coherent electronic excitations of the first image potential state.