Hannover 2003 – scientific programme
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Q: Quantenoptik
Q 49: Poster: Photonik
Q 49.23: Poster
Thursday, March 27, 2003, 16:30–18:30, Lichthof
The influence of disorder on the optical properties of metallic photonic crystals — •Dietmar Nau1, Harald Giessen1, André Christ2, Jürgen Kuhl2, Christel Zanke3, Michael Frommberger3, and Eckhard Quandt3 — 1Universität Bonn, Institut für Angewandte Physik, Wegelerstraße 8, D-53115 Bonn — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart — 3Stiftung caesar, Friedensplatz 16, D-53111 Bonn
Gold nanodots that are arranged periodically on a dielectric waveguide material show a pronounced minimum within the plasmon absorption spectrum [1]. This effect can be explained by the formation of a new quasi-particle, a so-called waveguide-plasmon polariton [2]. This results in a photonic bandgap for these structures. The aim of our work is to experimentally and theoretically examine the influence of disorder on the optical properties of these structures. A series of samples with controlled disorder was prepared, varying the position of the gold-dots with respect to the original grid. We consider a uniform, a Gaussian and a next-neighbour distribution. Angle-resolved extinction-measurements were performed on these samples and the dispersion of the polariton was determined. We show how disorder influences the optical properties and the photonic bandgap of our samples. [1] S. Linden et al., Phys. Rev. Lett. 86, 4688 (2001). [2] A. Christ et al., submitted to Phys. Rev. Lett.