13 November 2002 Excitation of mechanical modes in gold nanorods
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The acoustic vibrational modes of Au nanorods with aspect ratios between 2.1 and 5.5 have been investigated by timeresolved spectroscopy. The results show that laser excitation launches a coherent vibrational motion which has a period that depends linearly on the length of the rod. Due to polydispersity in the samples, the measured period also depends on the probe wavelength (i.e., for a given sample different probe wavelengths interrogate different length rods). Analysis of the data potentially provides information about the elastic properties of these unique materials.
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Gregory V. Hartland, Min Hu, Orla Wilson, Paul Mulvaney, "Excitation of mechanical modes in gold nanorods", Proc. SPIE 4934, Smart Materials II, (13 November 2002); doi: 10.1117/12.471958; https://doi.org/10.1117/12.471958

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