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Ultrafast Vibrations of Gold Nanorings
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    Ultrafast Vibrations of Gold Nanorings
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    Division of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan
    Department of Applied Physics, Chalmers University of Technology, S-41296, Göteborg, Sweden
    § iNANO Center, University of Aarhus, Aarhus 8000, Denmark
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    Nano Letters

    Cite this: Nano Lett. 2011, 11, 9, 3893–3898
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    https://doi.org/10.1021/nl202045z
    Published August 23, 2011
    Copyright © 2011 American Chemical Society

    Abstract

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    We investigate the vibrational modes of gold nanorings on a silica substrate with an ultrafast optical technique. By comparison with numerical simulations, we identify several resonances in the gigahertz range associated with axially symmetric deformations of the nanoring and substrate. We elucidate the corresponding mode shapes and find that the substrate plays an important role in determining the mode damping. This study demonstrates the need for a plasmonic nano-optics approach to understand the optical excitation and detection mechanisms for the vibrations of plasmonic nanostructures.

    Copyright © 2011 American Chemical Society

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    Supporting Information

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    We include movies of the simulated sample deformations and Uz components of the displacement at the five lowest resonance frequencies. Experimental results for white light spectroscopy and further details of the simulations are also provided. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Nano Letters

    Cite this: Nano Lett. 2011, 11, 9, 3893–3898
    Click to copy citationCitation copied!
    https://doi.org/10.1021/nl202045z
    Published August 23, 2011
    Copyright © 2011 American Chemical Society

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