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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.