Dresden 2020 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 61: Focus Session: Tailored Nonlinear Photonics I
HL 61.5: Hauptvortrag
Donnerstag, 19. März 2020, 11:30–12:00, POT 51
Watching plasmonic skyrmions spin using ultrafast two-photon photoelectron spectroscopy — •Harald Giessen1, Tim Davis1,2, Bettina Frank1, Pascal Dreher3, David Janoschka3, and Frank Meyer zu Heringdorf3 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart — 2University of Melbourne — 3CENIDE, University of Duisburg Essen
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. 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. Specifically, we image complete time sequences of propagating surface plasmons as well as plasmonic skyrmions on atomically flat single crystalline gold films that have been patterned using gold ion beam lithography. This allows us to unambiguously resolve all vector components of the electric field as well as their time dynamics, enabling the retrieval of the experimental time-dependent skyrmion number, and indicating the periodic transformation from skyrmions to anti-skyrmions and back.