Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 11: Plasmonics and Nanooptics I
O 11.7: Vortrag
Montag, 14. März 2011, 16:30–16:45, PHY C213
Mode imaging and selection in strongly coupled nanoantennas — Jer-Shing Huang1, •Johannes Kern1, Peter Geisler1, Pia Weinmann2, Martin Kamp2, Alfred Forchel2, Paolo Biagioni3, and Bert Hecht1 — 1Experimental Physics 5, University of Würzburg, Germany — 2Technische Physik, University of Würzburg, Germany — 3CNISM, Politecnico di Milano, Italy
Plasmonic nanostructures consisting of gold nano-wire pairs offer a large variety of different modes, depending on their geometric arrangement, for which the optical near-fields can be strongly confined in nanometerscale gaps. Of particular interest are modes which couple only weakly to the radiation field, e.g. due to a quadrupolar charge distribution. For such modes, simulations predict that the corresponding resonances should exhibit comparatively large quality factors due to the absence or the reduction of radiation damping.
In order to demonstrate a correspondence between simulations and experiments, we strive to fabricate gold nanostructures that are free of defects and exhibit ultra-smooth surfaces. To achieve this goal, we apply top-down nanofabrication methods, which rely on focused-ion-beam milling of large, but ultrathin single-crystalline gold flakes.
We will discuss simulations and experimental investigations of strongly-coupled optical antennas selectively excited to their antibonding resonance.