SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 15: Focus Session: Tailored Nonlinear Photonics
HL 15.4: Invited Talk
Thursday, September 30, 2021, 11:45–12:15, H4
Topological plasmonics: Ultrafast vector movies of plasmonic skyrmions on the nanoscale — •Harald Giessen1, Pascal Dreher2, David Janoschka2, Frank Meyer zu Heringdorf2, Tim Davis1,3, and Bettina Frank1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2CENIDE, University of Duisburg-Essen, Duisburg, Germany — 3University of Melbourne, Melbourne, Australia
Plasmonic skyrmions are topological defects in the electromagnetic near-field on thin metal films, recently observed using scanning near-field optical microscopy. However, only one spatial component of the electric field was measured and one of the most intriguing features of skyrmions, namely their dynamics, was not assessed.
Two-photon photoemission electron microscopy was previously able to image the local plasmon fields with femtosecond time resolution. Still, the vector information about the local electric fields was missing. Here we introduce a new technique, time-resolved vector microscopy, that enables us to compose entire movies on a sub-femtosecond time scale and a 10 nm spatial scale of the electric field vectors of surface plasmon polaritons [1]. Specifically, we image complete time sequences of propagating surface plasmons that demonstrates their spin-momentum-locking as well as plasmonic skyrmions on atomically flat single crystalline gold films that have been patterned using gold ion beam lithography.
[1] T. Davis et al., Science 367, eaba6415 (2020).