Drastic Reduction of Plasmon Damping in Gold Nanorods

C. Sönnichsen, T. Franzl, T. Wilk, G. von Plessen, J. Feldmann, O. Wilson, and P. Mulvaney
Phys. Rev. Lett. 88, 077402 – Published 31 January 2002
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Abstract

The dephasing of particle plasmons is investigated using light-scattering spectroscopy on individual gold nanoparticles. We find a drastic reduction of the plasmon dephasing rate in nanorods as compared to small nanospheres due to a suppression of interband damping. The rods studied here also show very little radiation damping, due to their small volumes. These findings imply large local-field enhancement factors and relatively high light-scattering efficiencies, making metal nanorods extremely interesting for optical applications. Comparison with theory shows that pure dephasing and interface damping give negligible contributions to the total plasmon dephasing rate.

  • Received 9 August 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.077402

©2002 American Physical Society

Authors & Affiliations

C. Sönnichsen, T. Franzl, T. Wilk, G. von Plessen*, and J. Feldmann

  • Photonics and Optoelectronics Group, Physics Department and CeNS, University of Munich, D-80799 München, Germany

O. Wilson and P. Mulvaney

  • School of Chemistry, University of Melbourne, Parkville, 3010, Victoria, Australia

  • *Present address: I. Phys. Inst., RWTH Aachen, D-52056 Aachen, Germany.

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Vol. 88, Iss. 7 — 18 February 2002

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