Berlin 2001 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 18: Poster: Polymer Blends, Heterogeneous Systems, Colloids and Nanoparticles, Interfaces, Polyelectrolytes

CPP 18.20: Poster

Mittwoch, 4. April 2001, 12:30–15:00, AT1

Dephasing times of the particle plasmon resonances in spherical gold and silver nanoparticles — •C. Sönnichsen, T. Wilk, S. Geier, E. Dulkeith, G. von Plessen, and J. Feldmann — Photonics and Optoelectronics Group, Physics Department and Center for Nanoscience (CeNS), University of Munich, Amalienstrasse 54, 80799 Muenchen, Germany

Gold and silver nanoparticles scatter light very efficiently at the particle plasmon frequency. The linewidths of this resonance is determined by the dephasing time of the particle plasmon and (in measurements on particle ensembles) by inhomogeneous broadening effects. By measuring light-scattering spectra of individual gold and silver nanoparticles in a microscope setup [1] we determine for the first time accurately and systematically the plasmon dephasing times for spherical gold and silver nanoparticles in the size range 20nm-150nm. We find good agreement with theoretical predictions. [1] No-dqSpectroscopy of single metallic nanoparticles using total internal reflection microscopyNo-dq C. Sönnichsen, S. Geier, N. E. Hecker, G. von Plessen, J. Feldmann, H. Ditlbacher, B. Lamprecht, J. R. Krenn, and F. R. Aussenegg, V. Z-H. Chan, J. P. Spatz, and M. Möller, Appl. Phys. Lett. 77, 2949