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Near-field investigations of nanoshell cylinder dimers

J. Chem. Phys. 131, 164704 (2009); doi:10.1063/1.3231870

Published 28 October 2009

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Katja Höflich,1 Ulrich Gösele,1 and Silke Christiansen2
1Max Planck Institute of Microstructure Physics, Halle D-06120, Germany
2Institute of Photonic Technology, Jena D-07745, Germany
Metallic nanoparticles are known to exhibit strong particle size dependent localized surface plasmon resonances due to their specific optical response described via the complex dielectric function. Using the two-dimensional finite element method, the near-field behavior of core-shell nanocylinder dimers with either a dielectric or a gold core and a silver shell was investigated. With a detailed analysis the positions of maximum field enhancement usable for highly sensitive spectroscopy were unveiled and the surface charge distributions of the different kinds of resonances were visualized. It is shown that the usual far-field spectra do not give reliable estimates of local electric field peaks. Furthermore one observes a distinct mode at the natural plasma frequency of the silver shell which is independent of the core material. This mode is identified as a volume plasmon mode. ©2009 American Institute of Physics
History: Received 6 July 2009; accepted 26 August 2009; published 28 October 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/164704/1
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KEYWORDS and PACS

Keywords
PACS
  • 78.67.Bf
    Optical properties of nanocrystals and nanoparticles
  • 73.25.+i
    Surface conductivity and carrier phenomena
  • 78.68.+m
    Optical properties of surfaces
  • 73.22.Lp
    Collective excitations (nanoscale materials)
  • 61.46.-w
    Structure of nanoscale materials
  • 78.20.Ci
    Optical constants
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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