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14 September 2006 Optical nonlinearities of metal nanoparticles: single-particle measurements and correlation to structure
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We have measured nonlinear scattering from plasmons in individual Au nanorods and have correlated second-harmonic activity of Ag nanoparticles and clusters to morphology. The measurements reveal novel ultrafast nonlinear phenomena related to electron confinement. Surprisingly, the coherent plasmon response is suppressed relative to the hot electron response indicating enhanced plasmon dephasing. In a parallel set of studies we demonstrate nanometer scale localization of the nonlinear optical response of single nanoparticles and aggregates and correlate this with their morphology. Position markers are fabricated on an optical and electron-transparent substrate (Si3N4 thin film) that allows optical measurements and transmission electron microscopy (TEM) imaging of the identical nanoparticles or aggregates. The second harmonic (SH) activity optical image of individual Ag nanostructures is registered with the TEM image. Centroid localization of the optical signals allows correlation with better than 25 nm precision. This is sufficient to determine the origin of optical "hot spots" within multi-particle aggregates.
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Norbert F. Scherer, Matthew Pelton, Rongchao Jin, Justin E. Jureller, Mingzhao Liu, Hee Y. Kim, Sungnam Park, and Philippe Guyot-Sionnest "Optical nonlinearities of metal nanoparticles: single-particle measurements and correlation to structure", Proc. SPIE 6323, Plasmonics: Metallic Nanostructures and their Optical Properties IV, 632309 (14 September 2006);

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