Regensburg 2007 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 18: Functionalized Nanoparticles
BP 18.5: Vortrag
Mittwoch, 28. März 2007, 15:00–15:15, H43
Surface-enhanced Raman scattering (SERS) in single gold nanoparticle dimers — •Moritz Ringler1, Alexander Schwemer1, Joachim Stehr1, Alfons Nichtl2, Konrad Kürzinger2, Gunnar Raschke1, Richard T. Phillips3, Thomas A. Klar1, and Jochen Feldmann1 — 1Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universität, 80799 Munich, Germany — 2Roche Diagnostics GmbH, Nonnenwald 2, D-82372 Penzberg, Germany — 3Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom
We have used protein-ligand interaction to link gold nanoparticles to dimers that have a well-defined SERS hot spot in the inter-particle gap. The dimer geometry is observed through Rayleigh scattering while the hot spot is probed via Raman spectroscopy. Surface-enhanced Raman emission from the dimer hot spot can be excited when the polarization of the Raman laser beam is parallel to the dimer axis. SERS spectra fluctuate both in shape and amplitude, and Raman emission and Rayleigh scattering spectra are strongly correlated.