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O: Fachverband Oberflächenphysik
O 78: Plasmonics and Nanooptics 3
O 78.3: Talk
Friday, September 9, 2022, 11:00–11:15, H3
Vector Polarimetry - Measuring Electrical Fields on Surfaces — •Alexandra Rödl1, David Janoschka1, Pascal Dreher1, Alexander Neuhaus1, Bettina Frank2, Timothy Davis1,2,3, Michael Horn-von Hoegen1, Harald Giessen2, and Frank-J. Meyer zu Heringdorf1 — 1Faculty of Physics and Center for Nanointegration, Duisburg-Essen, University of Duisburg-Essen, 47048 Duisburg, Germany — 24th Physics Institute, Research Center SCoPE, and Integrated Quantum Science and Technology Center, University of Stuttgart, 70569 Stuttgart, Germany — 3School of Physics, University of Melbourne, Parkville, Victoria 3010 Australia
Non-linear photoemission microscopy has been established as an excellent tool to investigate nano-optical fields at surfaces, in particular the fields of surface plasmon polaritons (SPPs). In a pump-probe experiment with femtosecond laser pulses we excite SPPs at grooves that are ion-milled into a Au platelet. The electric field of the probe-laser pulse interferes coherently with the electric field of the SPP and electrons are liberated through a nonlinear process by the combined field at the surface. The contrast depends on the alignment of the probe polarization and the orientation of the in-plane component of the SPP's electric field. Using a set of different polarizations for the probe laser pulse while keeping the same excitation conditions, one can reconstruct the in-plane component of the electric field of the SPP. The out-of-plane field component is calculated by Maxwell's equations to reconstruct the full electric vector field. Here, we measure and image complex electric vector fields of SPPs and analyze their topology.