Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 77: Poster: Plasmonics and Nanooptics
O 77.8: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Simulation of plasmonic nanoantennas excited by orbital angular momentum light — •Richard M. Kerber1,2, Jamie M. Fitzgerald2, Sang Soon Oh2,3, Ortwin Hess2, and Doris E. Reiter1,2 — 1Institut für Festkörpertheorie, Universität Münster, 48149 Münster, Germany — 2Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom — 3School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, United Kingdom
Orbital angular momentum light beams offer the possibility to encode additional information in the phase of the light beam, which makes them attractive for future communication technology. Here we study the interaction of orbital angular momentum light with plasmonic nanostructures and analyse the excited modes. Based on three different numerical and analytical methods, we show that for various combinations of polarization and orbital angular momentum of the incident light beam the scattering cross-section of rotation-symmetrical nanorod antennas displays different resonance modes [1]. The modes can be classified into bright and dark modes with their own resonance wavelengths. We compare the simulation results of the boundary element method with finite-difference time-domain simulations. Additionally we compare the numerical results with our analytical line antenna model. We discuss advantages and disadvantages of the three different approaches. [1] Kerber et al., ACS Photonics, 4, 891-896 (2017)