Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 24: Plasmonics & Nanooptics I: Metastructures and Novel Techniques (joint session O/CPP)
O 24.1: Vortrag
Dienstag, 2. April 2019, 10:30–10:45, H8
Creating functional plasmonic fields with orbital angular momentum via meta structures — •Eva Prinz1,2, Grisha Spektor3, Michael Hartelt1, Anna-Katharina Mahro1, Meir Orenstein3, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Staudingerweg 9, 55128 Mainz, Germany — 3Department of Electrical Engineering, Technion - Israel Institute of Technology, Israel
Optical fields can carry spin angular momentum (SAM) in the form of circularly polarized light and orbital angular momentum (OAM) as helical wavefronts. In the field of plasmonics, surface plasmon polaritons (SPPs) can carry surface confined OAM in the form of plasmonic vortices. Controlling such vortices opens the door towards a variety of applications.
Plasmonic OAM can be generated by the use of plasmonic vortex lenses (PVLs), a type of coupling structure based on Archimedean spirals. We demonstrate both experimentally and in simulations a modular plasmonic lens assembling strategy for the sculpturing of functional plasmonic fields. This approach is based on meta structures and allows the creation of lenses with an effective chirality that depends on the illumination. The coupling structures are milled into a gold surface and the created SPPs are detected via time-resolved PEEM.