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O: Fachverband Oberflächenphysik
O 63: Plasmonics and Nanooptics V
O 63.10: Talk
Thursday, March 25, 2010, 12:45–13:00, H32
Analytic Theory of Linear Plasmonic Antennas — Jens Dorfmüller1, Ralf Vogelgesang1, •Moritz Eßlinger1, Worawut Khunsin1, Christian Ettrich2, Carsten Rockstuhl2, and Klaus Kern1 — 1Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 2Institute of Condensed Matter Theory and Solid State Optics, Friedrich-Schiller Universität Jena
At radio-frequencies, antenna theory is a well understood topic. At optical frequencies, however, antenna sizes are in the order of skin depths so that electromagnetic fields penetrate substantially into the volume of metallic nanostructures, rendering classic radio antenna theory not applicable. We develop a fully analytical model for the electromagnetic behavior of plasmonic wires. Therefore, we model thin, linear plasmonic antennas based on the assumption of homogeneous volume currents. Our model requires only a handful, physically motivated, adjustable parameters. It successfully predicts measured and simulated data in full detail: emission patterns, nearfield optical amplitudes and phases, as well geometric resonances.