Plasmonic percolation: Plasmon-manifested dielectric-to-metal transition
Type
ArticleAuthors
Chen, HuanjunWang, Feng
Li, Kun
Woo, Katchoi
Wang, Jianfang
Li, Quan
Sun, Ling Dong
Zhang, Xixiang

Lin, Haiqing
YAN, Chunhua
KAUST Department
Advanced Nanofabrication, Imaging and Characterization Core LabCore Labs
Imaging and Characterization Core Lab
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2012-07-11Online Publication Date
2012-07-11Print Publication Date
2012-08-28Permanent link to this record
http://hdl.handle.net/10754/562281
Metadata
Show full item recordAbstract
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/nn302220ySponsors
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 NanoPubMed ID
22757659ae974a485f413a2113503eed53cd6c53
10.1021/nn302220y
Scopus Count
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