Open AccessLocal-field confinement in three-pair arrays of metallic nanocylinders
Author(s) -
Ming Yaw Ng,
Wei Chih Liu
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.004504
Subject(s) - surface plasmon resonance , surface plasmon , radius , optics , localized surface plasmon , resonance (particle physics) , materials science , plasmon , wavelength , excitation , surface plasmon polariton , field (mathematics) , local field , molecular physics , physics , condensed matter physics , atomic physics , nanotechnology , nanoparticle , computer security , mathematics , quantum mechanics , computer science , pure mathematics
Confinement of light in nano-scale region of three silver nanocylinder pairs is studied by finite-difference time-domain simulations. Light is confined in gaps between nanocylinders due to localized plasmon excitation and the strongest local-field enhancement exhibits in the gap of the second pair. The surface plasmon resonance has red-shift for nanocylinders of larger radius. The resonance wavelength and local-field enhancement are nearly proportional to the radius of nanocylinders in visible light region, i.e., the plasmon resonance of nanocylinder pairs is predictable and controllable. An open cavity model is proposed to understand the linear relation between the resonant wavelength and the radius of nanocylinders.