Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.27: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Electromagnetic field distribution around gold nanorings under excitation with cylindrical vector beams — •Julia Fulmes1, Christian Schäfer1, Sebastian Jäger2, Dominik A. Gollmer1, Andreas Horrer1, Dai Zhang2, Alfred J. Meixner2, Dieter P. Kern1, and Monika Fleischer1 — 1Institute for Applied Physics, Eberhard Karls University of Tübingen, Germany — 2Institute of Physical and Theoretical Chemistry, Eberhard Karls University of Tübingen, Germany
We investigate the optical behaviour of gold nanorings (NR) with variable geometries excited with cylindrical vector beams. The flexibility of lithographical fabrication processes enables precise control over the size, shape and surface smoothing of the nanostructures. We analyze the optical properties of gold nanorings by the combination of single particle dark field spectroscopy and confocal photoluminescence (PL) imaging. By illuminating the NR with cylindrical vector beams different photoluminescence patterns can be achieved depending on the ring diameters. The resulting PL images are explained by different overlap conditions between the ring and the individual components of the electromagnetic field in the focal spot. The observed excitation efficiency of discrete plasmon modes of the ring is in good agreement with numerical calculations. By matching the rings geometry to the illumination conditions the confined electromagnetic field can be maximized, enabling interesting applications of such nano-antenna as selective electric nanosource.