Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Nano-Optical Investigation of Enhanced Field at Gold Nanosphere-Gold Plane Junctions

  • Ahn, Sung-Hyun (Department of Chemistry and Center for Photo- and Electro-Responsive Molecules, Korea University) ;
  • Park, Won-Hwa (Department of Chemistry and Center for Photo- and Electro-Responsive Molecules, Korea University) ;
  • Kim, Zee-Hwan (Department of Chemistry and Center for Photo- and Electro-Responsive Molecules, Korea University)
  • Published : 2007.12.20
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Abstract

The local field distribution around gold nanosphere-gold plane junction has been studied using the finitedifference time-domain (FDTD) electrodynamics calculation procedure. We find that both the in-plane and out-of-plane polarized excitation produce enhanced field strong enough to explain the observed SERS activities of the junctions. Comparison with a simple dipole-image dipole model shows that the enhanced field primarily originates from the multipole-image multipole interaction, which indicates that the detailed fine-structures of the nanoparticles also play a significant role in the SERS activities as well.

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References

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