Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 6: Photonic crystals I
HL 6.2: Vortrag
Montag, 25. Februar 2008, 09:45–10:00, EW 201
Tailoring the polaritonic stop gap in metallo-dielectric photonic crystal superlattices — •Tobias Utikal1, Thomas Zentgraf1, André Christ2, Sergei G. Tikhodeev3, Nikolai A. Gippius3, and Harald Giessen1 — 14. Physikalisches Institut, Universität Stuttgart, Germany — 2Ècole Polytechnique Fédérale de Lausanne, Switzerland — 3General Physics Institute, Moscow, Russia
We experimentally and theoretically investigate the influence of the superlattice parameters on the polaritonic stop gap in metallo-dielectric photonic crystal superlattices. We show that the stop gap can be tailored by structuring the elementary unit cells of the superlattice.
Our model system consists of periodically arranged metal nanowires on top of a dielectric slab waveguide. With normal light incidence, a collective electron oscillation in the wires as well as a photonic mode in the waveguide slab can be excited. These modes form a waveguide plasmon polariton in the strong coupling regime. By tilting the angle of incidence of the light, the in-plane wavevector is changed, hence allowing to measure k-dependent dispersion as well as the size of the stop gap. For our specific superlattice case, we constructed metallic photonic crystal slabs by creating supercells from standard metallic photonic crystal building blocks and varied the superlattice parameters such as cell size and inter-cell distance. The optical properties were studied by conventional angle-resolved white-light transmission measurements.
We were able to explain the experiments using a miniband model and reproduced the results by scattering matrix based calculations.