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O: Fachverband Oberflächenphysik
O 87: Mini-Symposium: Infrared nano-optics I
O 87.3: Talk
Thursday, March 4, 2021, 11:45–12:00, R2
Vector Microscopy - Nonlinear Photoemission Microscopy Reveals Plasmonic Fields — •David Janoschka1, Pascal Dreher1, Yannik Paul1, Timothy Davis1,2,3, Bettina Frank2, Michael Horn- von Hoegen1, Harald Gießen2, and Frank-J. Meyer zu Heringdorf1 — 1Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany. — 24th Physics Institute, University of Stuttgart, 70569 Stuttgart, Germany. — 3School of Physics, University of Melbourne, Parkville, Victoria 3010 Australia
Exploring the topology of electromagnetic near-fields is one of the central topics in nano-optics. To investigate spatiotemporal details of the topology on a local scale intrinsically requires knowledge of the time-dependent local electric field vectors. While time-resolved photoemission microscopy (TR-PEEM) has been established as an excellent tool to study the dynamics of nano-optical fields at surfaces, the vectorial nature of the fields was not accessible so far.
Here, we present the new method of 'vector microscopy' as a local field vector sensitive development of TR-PEEM. We use femtosecond laser pulses to excite and probe surface plasmon polaritons (SPPs) in tailored nanostructures. Using two different probe laser pulses of orthogonal polarization at the same pump-probe delay enables us to extract the in-plane component of the SPP's near-field. The out-of-plane field component is reconstructed using Maxwell's equations. We apply the new vector microscopy method to complex topological SPP fields. We demonstrate reconstruction of the electric and the magnetic field, and extract the topological properties in time and space.