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Phys. Rev. Lett. 88, 077402 (2002) [4 pages]

Drastic Reduction of Plasmon Damping in Gold Nanorods

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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

Received 9 August 2001; published 31 January 2002

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.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.88.077402
DOI: 10.1103/PhysRevLett.88.077402
PACS: 78.67.Bf, 73.22.Lp, 78.66.Vs

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

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