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MO: Molekülphysik
MO 14: Spektroscopy II
MO 14.7: Talk
Friday, April 6, 2001, 17:15–17:30, H1058
Fluorescence quenching in the vicinity of metal nanoparticles — •Morteani Arne1, Dulkeith Eric1, Sönnichsen Carsten1, Feldmann Jochen1, Riethmüller Silke2, Spatz Joachim2, and Möller Martin2 — 1Photonics and Optoelectronics Group, Physics Department and CeNS, University of Munich, Amalienstrasse 54, 80799 Munich — 2Laboratory of Organic and Macromolecular Chemistry, OC3, University of Ulm, Albert-Einstein-Allee 11, 89069 Ulm
It is well known that the fluorescent properties of molecules are drastically changed in the vicinity of metal surfaces. Near such a conductive surface, the molecular excitation can be dissipated in the metal as a result of an energy transfer from the molecule to the metal. Much less is known about how the fluorescent properties of a molecule change in the vicinity of a metal nanoparticle. In contrast to metal films, the optical properties of metal nanoparticles and thus their ability to alter the fluorescence of nearby molecules critically depend on a series of parameters. Here we present results on dye fluorescence quenching induced by gold nanoparticles having different sizes. Time-integrated and time-resolved fluorescence spectra clearly show that the quenching efficiency decreases with decreasing size of the gold particles.