Surface-Enhanced Plasmon Splitting in a Liquid-Crystal-Coated Gold Nanoparticle

Details Surface-Enhanced Plasmon Splitting in a Liquid-Crystal-Coated Gold Nanoparticle Surface-Enhanced Plasmon Splitting in a Liquid-Crystal-Coated Gold Nanoparticle

2005-04-28

arxiv.org/abs/cond-mat/0504765v1

Physics

Condensed Matter

Materials Science

5 pages, 3 figures To be published in PRL

Scientific paper

10.1103/PhysRevLett.94.217401

We show that, when a gold nanoparticle is coated by a thin layer of nematic liquid crystal, the deformation produced by the nanoparticle surface can enhance the splitting of the nanoparticle surface plasmon. We consider three plausible liquid crystal director configurations in zero electric field: boojum pair (north-south pole configuration), baseball (tetrahedral), and homogeneous. From a calculation using the Discrete Dipole Approximation, we find that the surface plasmon splitting is largest for the boojum pair, intermediate for the homogeneous, and smallest for the baseball configuration. The boojum pair results are in good agreement with experiment. We conclude that the nanoparticle surface has a strong effect on the director orientation, but, surprisingly, that this deformation can actually enhance the surface plasmon splitting.

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