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Q: Quantenoptik und Photonik
Q 25: Photonische Kristalle II
Q 25.7: Talk
Tuesday, March 14, 2006, 15:15–15:30, HI
Correlation effects in disordered metallic photonic crystal slabs — •Dietmar Nau1, Anja Schönhardt1, Christina Bauer2, André Christ2, Thomas Zentgraf2, Jürgen Kuhl2, and Harald Giessen3 — 1Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, D-53115 Bonn — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart — 34. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart
It was found that the periodic arrangement of gold nanostructures on top of a dielectric waveguide layer leads to strong coupling of particle plasmons and quasiguided modes [1]. In this work we present the influence of positional disorder of the nanostructures on the optical properties of such systems. We introduce artificial disorder with correlated and uncorreated next-neighbor positions. The models are characterized by a Fourier analysis of the spatial arrangement of the nanostructures. Both disorder types strongly modify the optical properties of such metallic photonic crystal slabs. However, substantially different behaviors regarding the linear optical properties and the bandstructure occur. Whereas uncorrelated disorder only reduces the coupling strength, correlated disorder additionally broadens the resonances inhomogeneously due to the excitation of multiple quasiguided modes [2]. A straightforward theory derived from diffraction experiments reveals nice agreement with the experimental observations.
[1] A. Christ et al., Phys. Rev. Lett. 91, 183901 (2003).
[2] D. Nau et al., submitted for publication.