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Summary: Interfacial Velocity-Dependent Plasmon Damping in Colloidal Metallic Nanoparticles
R. Zadoyan
Technology and Applications Center, Newport Corporation, 1791 Deere AVenue, IrVine, California 926006
H. Ye. Seferyan, A. W. Wark, R. M. Corn, and V. A. Apkarian*
Department of Chemistry, UniVersity of California, IrVine, California 92697
ReceiVed: February 26, 2007; In Final Form: May 9, 2007
Modulation of the surface plasmon resonance of colloidal silver nanoparticles driven by particle shape
oscillations is interrogated via transient-scattering measurements using white light as the probe. The two-
dimensional (, t) image of the spectrally resolved scattering shows /2 phase shift between the modulation
of center (t) and width (t) of the resonance - while is modulated by the strain amplitude, the plasmon-
damping rate is modulated by the strain rate. We ascribe the effect to scattering from the electrophoretic
potential generated by the motion of the interfacial double layer of the colloidal particles.
Introduction
Plasmon resonances of metallic nanoparticles have been of
historical interest, first quantified by Mie for the case of spherical
particles.1 Presently, they are the subject of great interest due
to the multitude of applications enabled by locally enhanced
electric fields and nonlinear optical phenomena mediated by
them.2,3 The optical properties of nanoparticles, summarized by
their extinction spectra, depend on size, shape, dielectric
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