Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 11: Plasmonics and Nanooptics II: Microscopy

O 11.2: Talk

Monday, March 7, 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 Aeschlimann¹ — ¹Physics 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.