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O: Fachverband Oberflächenphysik
O 30: Plasmonics and Nanooptics III
O 30.4: Talk
Tuesday, March 12, 2013, 11:15–11:30, H31
Morphological tuning of the plasmon dispersion in dielectric-loaded nanofiber waveguides — •Till Leißner1, Christoph Lemke1, Jacek Fiutowski2, Jörn Radke2, Alwin Klick1, Luciana Tavares2, Jakob Kjelstrup-Hansen2, Horst-Günter Rubahn2, and Michael Bauer1 — 1Christian-Albrechts-Universität zu Kiel, IEAP, 24098 Kiel (Germany) — 2Mads Clausen Institute, NanoSYD, University of Southern Denmark, Alsion 2, DK-6400 Sønderborg (Denmark)
Understanding the impact of lateral mode confinement in plasmonic waveguides is of fundamental interest regarding potential applications in plasmonic devices. The knowledge of the frequency-wave vector dispersion relation provides the full information on electro-magnetic field propagation in a waveguide. Here two-photon photoemission electron microscopy is used to measure the real part of the surface plasmon polariton dispersion relation in the near infrared spectral regime for individual nanoscale plasmonic waveguides, which were formed by deposition of para-Hexaphenylene (p-6P) based nanofibers on top of a gold film. Characterization by means of scanning electron microscopy and atomic force microscopy provides accurate information on the dimensions of the investigated waveguides and enables us to quantify the effect of mode confinement by comparison with experimental results from continuous p-6P films on a gold substrate and calculations based on the effective index method. Our results show that the structural control of the cross-sectional dimension of a p-6P nanofiber provides a promising means for the customized design of plasmonic waveguides.