Plasmon hybridization in nanorod dimers |
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Authors: | B Willingham D W Brandl P Nordlander |
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Institution: | (1) Department of Physics and Astronomy, Laboratory for Nanophotonics, Rice University, M.S. 61, Houston, TX 77251-1892, USA |
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Abstract: | Using the plasmon hybridization method we investigate the plasmon modes of nanorod dimers in axial and parallel orientations.
We show that the plasmon modes of the system can be viewed as bonding and anti-bonding modes resulting from the hybridization
of the plasmon modes of the individual nanorods. The dimer plasmon modes are found to depend sensitively on separation between
the nanorods and on their relative spatial orientation. The calculated optical properties agree quantitatively with results
from the numerical finite-difference time-domain method. The electric field enhancements are found to depend strongly on aspect
ratio defined as the ratio of the major and minor radii, and on the relative orientation of the nanorods. For a nanorod dimer
of fixed overall length, the maximum field enhancements are lower than those induced in a solid sphere dimer. |
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Keywords: | PACS" target="_blank">PACS 78 67 -n 78 67 Bf 36 40 Vz 73 22 Lp |
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