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O: Fachverband Oberflächenphysik

O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces

O 36.19: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

Strong-Field Electron Emission in a Photoemession Electron Microscope (PEEM) — •Kerstin Harland, Lina Hansen, Katrin Meier, Arvid Klösgen, and Jan Vogelsang — Institut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, Germany

Time-resolved photoemission electron microscopy (PEEM) is well suited for investigating electric fields at nanostructures. Beyond imaging, exerting control on charge carriers with strong optical electric fields on the nanoscale is an ongoing challenge. Space charge constraints so far limit the applicable optical field strengths.

To overcome this problem, we investigate electron emission from a thin, monocrystalline gold flake with our photoemission electron microscope. We write an antenna in the gold flake so that surface plasmons can be excited. To reach the needed high intensity, we focus a 2000-nm wavelength laser beam with few-cycle pulses from our home-built laser system through the backside of the sample onto the gold flake antenna. Compared to conventional PEEM setups, this allows us to obtain a smaller focus size and address individual antennas without space charge problems. The antenna in the gold flake concentrates the optical energy from the laser in a small region, where electrons are emitted. We investigate the emission point and energy spectrum from these electrons with varying laser parameters.

Keywords: PEEM; electrons; gold flake; strong-field; plasmonic