Regensburg 2004 – wissenschaftliches Programm
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O: Oberflächenphysik
O 19: Teilchen und Cluster II
O 19.6: Vortrag
Dienstag, 9. März 2004, 12:30–12:45, H39
Luminescence from gold nanoparticles mediated by plasmon emission — •T. A. Klar1, E. Dulkeith1, T. Niedereichholz1, J. Feldmann1, G. von Plessen2, D. I. Gittins3, S. Mayya3, and F. Caruso3,4 — 1Photonics and Optoelectronics Group, Department of Physics and CeNS, Ludwig-Maximilians-Universität München — 21. Physikalisches Institut, RWTH Aachen — 3Max-Planck-Institut für Kolloid- und Grenzflächenforschung — 4Department of Chemical and Biomolecular Engineering, The University of Melbourne, Australia
We observe photoluminescence emission at the particle plasmon frequency from gold nanoparticles when the nanoparticles are excited above the d - sp interband transition threshold. Estimates of quantum yields for direct emission from d - sp interband recombination in bulk metals have given quantum efficiencies of 10−10 [1]. In contrast, here we observe a quantum efficiency of 10−6 , which is essentially independent of the particle size. This increased quantum efficiency is explained by a two step process: Instead of a direct emission of a photon, the d - sp band recombination excites a particle plasmon which in turn decays radiatively, emitting a photon.
[1] Mooradian, Phys. Rev. Lett. 5, 185 (1969)