Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.36: Poster
Tuesday, April 1, 2014, 18:30–22:00, P2
Circular Plasmons in cross shaped nanoantennas — •Martin Lehr1, Peter Klaer1, Xiaofei Wu2, Bert Hecht2, Florian Schertz1, Gerd Schönhense1, and Hans Joachim Elmers1 — 1Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, D-55099 Maiz, Germany — 2Institut für Physik, Julius-Maximilians- Universität, Am Hubland, 97074 Würzburg, Germany
Optical near-fields generated by coupled plasmonic modes can have defined polarization states. In analogy to cross dipole antennas for radio waves, the cross-shaped arrangement of dipole nanoantennas investigated here concentrates not only intensity, but also the angular momentum of circularly polarized infrared light. The field enhancement of individual nanoantennas has been measured by the relative photoemission intensity using a photoemission electron microscope with front side illumination at grazing incidence and backside illumination at normal incidence. The analysis of the polarization dependence reveals the excitation of a unique circular plasmon mode. The strong confinement of angular momentum promises a strong coupling of the photon angular momentum to magnetic moments and to the spin of photo-emitted electrons.
Funded by DFG (EL172-16)