Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Poster Tuesday: Ultrafast Processes 2

O 33.8: Poster

Dienstag, 6. September 2022, 11:00–13:00, P3

Time- and Angle-Resolved Photoelectron Spectroscopy with Nano-Focused Surface Plasmon Polaritons — •Alexander Neuhaus, Pascal Dreher, David Janoschka, Michael Horn-von Hoegen, and Frank-J. Meyer zu Heringdorf — Faculty of Physics and Center for Nanointegration, Duisburg-Essen (CENIDE), 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. Time- and angle-resolved photoelectron spectroscopy with attosecond precision provides us access to the coherent and incoherent dynamics of the electron emission process. The technique is applied to the system Cs/Au(111), where we find a resonant enhancement of the electron emission by an image potential state.