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Updated: May 24, 2026

Trapping of Micro Particles in Nanoplasmonic Optical Lattice
Published on: September 5, 2017
Dispersion relation and radiation properties of plasmonic crystals with triangular lattices
Takayuki Okamoto1, Satoshi Kawata
1RIKEN-The Institute of Physical and Chemical Research, Hirosawa, Wako, Saitama 351-0198, Japan. okamoto@riken.jp
Abstract:
The optical properties of plasmonic crystals consisting of triangular lattices are theoretically investigated using rigorous coupled-wave analysis. Two types of structures were analyzed, one composed of an array of short cylindrical pillars on a flat metal surface and the other composed of an array of shallow cylindrical holes formed in a flat metal surface. The dispersion relations and radiation properties of the second and the third bands around the Γ point in the first Brillouin zone were investigated. We found these properties to be highly dependent on the radii of the cylindrical pillars and holes relative to the lattice constant. We also examined the influence on the dispersion relations and radiation properties of the deviation of the cross-section of the pillars and holes from a perfect circle.
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