Drastic reduction of plasmon damping in gold nanorods.
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.
Sönnichsen
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Photonics and Optoelectronics Group, Physics Department and CeNS, University of Munich, D-80799 München, Germany.
Franzl
T
T
Wilk
T
T
von Plessen
G
G
Feldmann
J
J
Wilson
O
O
Mulvaney
P
P