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    Plasmonic percolation: Plasmon-manifested dielectric-to-metal transition

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    Type
    Article
    Authors
    Chen, Huanjun
    Wang, Feng
    Li, Kun
    Woo, Katchoi
    Wang, Jianfang
    Li, Quan
    Sun, Ling Dong
    Zhang, Xixiang cc
    Lin, Haiqing
    YAN, Chunhua
    KAUST Department
    Advanced Nanofabrication, Imaging and Characterization Core Lab
    Core Labs
    Imaging and Characterization Core Lab
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2012-07-11
    Online Publication Date
    2012-07-11
    Print Publication Date
    2012-08-28
    Permanent link to this record
    http://hdl.handle.net/10754/562281
    
    Metadata
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    Abstract
    Percolation generally refers to the phenomenon of abrupt variations in electrical, magnetic, or optical properties caused by gradual volume fraction changes of one component across a threshold in bicomponent systems. Percolation behaviors have usually been observed in macroscopic systems, with most studies devoted to electrical percolation. We report on our observation of plasmonic percolation in Au nanorod core-Pd shell nanostructures. When the Pd volume fraction in the shell consisting of palladium and water approaches the plasmonic percolation threshold, ∼70%, the plasmon of the nanostructure transits from red to blue shifts with respect to that of the unshelled Au nanorod. This plasmonic percolation behavior is also confirmed by the scattering measurements on the individual core-shell nanostructures. Quasistatic theory and numerical simulations show that the plasmonic percolation originates from a positive-to-negative transition in the real part of the dielectric function of the shell as the Pd volume fraction is increased. The observed plasmonic percolation is found to be independent of the metal type in the shell. Moreover, compared to the unshelled Au nanorods with similar plasmon wavelengths, the Au nanorod core-Pd shell nanostructures exhibit larger refractive index sensitivities, which is ascribed to the expulsion of the electric field intensity from the Au nanorod core by the adsorbed Pd nanoparticles. © 2012 American Chemical Society.
    Citation
    Chen, H., Wang, F., Li, K., Woo, K. C., Wang, J., Li, Q., … Yan, C.-H. (2012). Plasmonic Percolation: Plasmon-Manifested Dielectric-to-Metal Transition. ACS Nano, 6(8), 7162–7171. doi:10.1021/nn302220y
    Sponsors
    This work was supported by the Research Grants Council of Hong Kong (GRF, ref. no. CUHK403211, Project Code 2130277, and Special Equipment Grant, ref. no. SEG_CUHK06).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/nn302220y
    PubMed ID
    22757659
    ae974a485f413a2113503eed53cd6c53
    10.1021/nn302220y
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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