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Q: Quantenoptik und Photonik

Q 35: Poster Photonische Kristalle

Q 35.14: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

Tailoring the Rabi splitting of waveguide-plasmon polaritons — •Christina Bauer¹, Thomas Zentgraf¹, André Christ¹, Jürgen Kuhl¹, Sergei G. Tikhodeev², Nikolai A. Gippius², and Harald Giessen³ — ¹Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — ²General Physics Institute RAS, Moscow 119991, Russia — ³4th Physics Institute, University of Stuttgart, 70550 Stuttgart, Germany

Metallic nanowire arrays on top of a waveguiding substrate show a strong coupling between particle-plasmons and waveguide modes. The thereby formed waveguide-plasmon polaritons have a large Rabi splitting of up to 250 meV. By introducing a dielectric spacer layer, the coupling becomes weaker resulting in a smaller Rabi splitting. In our case, we deposited gold nanowires with a width of 100 nm and a height of 20 nm by electron-beam lithography on top of a SiO₂ spacer layer and a 140-nm-thick Indium-Tin-Oxide (ITO) waveguide. The spacer layer thickness was varied between 0 nm and 350 nm. We will show that by increasing the spacer layer thickness the wavefunction overlap between the plasmons and the waveguide modes is reduced and the splitting of the polariton modes becomes smaller. The measurements are in good agreement with simulations done by a scattering matrix method.