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Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 18: Plasmonics and Nanooptics I: Microscopy

HL 18.2: Vortrag

Montag, 7. März 2016, 15:30–15:45, S054

Imaging the dynamics of plasmonic vortices — •Deirdre Kilbane1, Anna-Katharina Mahro1, Stefan Mathias1, Grisha Spektor2, Lior Gal2, Meir Orenstein2, Bettina Frank3, Simon Ristock3, Harald Giessen3, Philip Kahl4, Daniel Podbiel4, Frank Meyer zu Heringdorf4, and Martin Aeschlimann11Physics Department and Research Centre OPTIMAS, University of Kaiserslautern, Germany — 2Department of Electrical Engineering, Technion, Haifa, Israel — 3Fourth Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 4Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany

The formation of a plasmonic vortex (rotational flow around a phase singularity) can be achieved by selecting the spin of circularly polarized light, and the geometry of the illuminated metallic structure. We perform near-field imaging of the ultrafast dynamics of plasmonic vortices using time-resolved two photon photoemission electron microscopy (TR-PEEM). A broadband ultrashort pulse laser excites and probes surface plasmon polaritons (SPPs) with 100 as time step and 40 nm spatial resolution. Here we observe the sub-optical cycle spatiotemporal evolution of the dynamics in plasmonic Archimedes spirals (PAS) and plasmonic vortex lenses (PVL). These structures were fabricated by focused ion beam (FIB) milling into the surface of thin polycrystalline gold films and single crystalline, atomically flat gold flakes.

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