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HL: Fachverband Halbleiterphysik
HL 11: Plasmonics and Nanooptics I: Light-Matter Interactions
HL 11.6: Vortrag
Montag, 20. März 2017, 11:45–12:00, TRE Ma
Using plasmonic nanoantennas to read out the orbital angular momentum of light — •Richard M. Kerber1, Jamie M. Fitzgerald2, Sang Soon Oh2, Ortwin Hess2, and Doris E. Reiter1,2 — 1Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany — 2Department of Physics, The Blackett Laboratory, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom
The orbital angular momentum of light has recently been recognized as a new degree of freedom to encode information in communication technology. One way to determine the orbital angular momentum of light is to destroy the helical wavefront of the light beam. We here propose an alternative way to read out the orbital angular momentum of light using plasmonic nanoantennas by converting the phase information into spectral information without losing the phase properties of the beam. Using the excitation of bright and dark modes of a plasmonic nanoantenna, which exhibit different resonant wavelengths, the determination of the value of orbital angular momentum of the light beam becomes possible. Exemplary considering rotation-symmetrical nanorod antennas we show that their scattering cross-section is sensitive to the value of orbital angular momentum combined with the polarization of an incident orbital angular momentum light beam. For the simulation of the scattering cross-section we use the boundary element method and further predict the orbital angular momentum dependence of the excited modes with an analytical line antenna model.