Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 28: Plasmonics and Nanooptics III
O 28.2: Talk
Tuesday, March 15, 2011, 11:30–11:45, WIL A317
Near-Field Imaging of Directive Optical Yagi-Uda Nanoantennas — •Jens Dorfmüller1, Daniel Drégely1, Moritz Eßlinger2, Worawut Khunsin2, Ralf Vogelgesang2, Klaus Kern2,3, and Harald Giessen1 — 14. Physikalisches Institut und Research Center SCoPE, Pfaffenwaldring 57, Universität Stuttgart, 70569 Stuttgart, Germany — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany — 3Institut de Physique de la Matière Condensée, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
Apertureless Scanning Near-field Optical Microscopy (aSNOM) in a cross-polarization scheme allows us to map the E-fields of plasmonic nano-structures in real-space with a resolution far beyond the diffraction limit [1,2]. Maps of near-field amplitude and phase allow us to determine the excitation mode. Analyzing the amplitude at elements of optical nano-antennas allows us to measure the receptivity in dependence of antenna geometry as well as illumination conditions.
Here, we investigate the reception directionality of optical Yagi-Uda antennas. Depending on the illumination direction, the electromagnetic energy is either concentrated at the feed element or distributed over several antenna elements. Comparison with simulations shows a very good agreement.
J. Dorfmüller, R. Vogelgesang, R. T. Weitz, C. Rockstuhl, C. Etrich, T. Pertsch, F. Lederer, K. Kern, Nano Lett. 9, 2372 (2009).
J. Dorfmüller, R. Vogelgesang, W. Khunsin, C. Rockstuhl, C. Etrich, K. Kern, Nano Lett. 10, 3596 (2010).