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Proceedings Paper

Nanoscale coupling effects on single particle microscopy
Author(s): Kevin L. Shuford; Kent A. Meyer; Cuncheng Li; Sung Oh Cho; William B. Whitten; Robert W. Shaw
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Paper Abstract

We present theoretical studies and experimental results on the optical properties of gold, octahedra-shaped nanoparticles. We show that the optical spectrum varies quite dramatically as two nanoparticles are brought into close proximity. AFM images and optical spectra have been obtained for nanooctahedra dimers in uncoupled and strongly coupled configurations. The former displays a single peak in the optical spectrum, while the latter shows an additional peak at longer wavelengths. Calculations indicate that the additional spectral feature originates from a strongly coupled plasmon state that oscillates along the extended axis of the dimer. We investigate theoretically the distances over which the dimers couple and find these results to be particularly orientation dependent. The anisotropic particle shape and sharp apices contribute significantly to the orientational dependence of the interparticle couplings.

Paper Details

Date Published: 28 August 2008
PDF: 9 pages
Proc. SPIE 7033, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV, 70330I (28 August 2008); doi: 10.1117/12.795359
Show Author Affiliations
Kevin L. Shuford, Oak Ridge National Lab. (United States)
Kent A. Meyer, Oak Ridge National Lab. (United States)
Cuncheng Li, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Sung Oh Cho, Korea Advanced Institute of Science and Technology (Korea, Republic of)
William B. Whitten, Oak Ridge National Lab. (United States)
Robert W. Shaw, Oak Ridge National Lab. (United States)


Published in SPIE Proceedings Vol. 7033:
Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV
Satoshi Kawata; Vladimir M. Shalaev; Din Ping Tsai, Editor(s)

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