Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Ultrafast Electron Dynamics at Surfaces and Interfaces IV
O 45.8: Vortrag
Mittwoch, 20. März 2024, 12:15–12:30, MA 041
Coherent Time- and Angle-Resolved Photoelectron Spectroscopy in a Low Energy Electron Microscope — •Alexander Neuhaus1, Pascal Dreher1, Florian Schütz2, Helder Marchetto2, Torsten Franz2, Michael Horn-von Hoegen1, and Frank J. Meyer zu Heringdorf1,3 — 1Faculty of Physics and Center for Nanointegration, Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47048 Duisburg, Germany — 2ELMITEC Elektronenmikroskopie GmbH, 38678 Clausthal-Zellerfeld, Germany — 3Interdisciplinary Center for the Analytics on the Nanoscale (ICAN), 47057 Duisburg, Germany
In modern photoemission microscopes the electron optics allows different imaging modes such as real space imaging or momentum microscopy. Here, we describe how a spectroscopic and low energy electron microscope (SPE-LEEM) can be equipped with an additional slit at the entrance of the hemispherical analyzer to enable a ARPES like mode with micrometer spatial selectivity while maintaining all other imaging modes. We use a photogrammetric calibration to correct for image distortions caused by the magnetic projective system and to calibrate the momentum and energy axis. We demonstrate the capabilities of the new ARPES mode by analyzing the time-resolved nonlinear electron emission from a plasmonic nano-focus on a Au(111) platelet using a femtosecond laser.
Keywords: time-resolved PEEM; LEEM; time-resolved ARPES; surface plasmon polaritons; photoelectron spectroscopy