Understanding near/far-field engineering of optical dimer antennas through geometry modification

Numerical investigations based on the boundary element method (BEM) have been carried out to two-dimensional (2-D) silver dimer nano-antennas of various geometries. The near-field and far-field properties are mainly determined by the local geometry at the gap and the global shape of the antenna shaf...

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Bibliographic Details
Published in:Optics express 2009-11, Vol.17 (23), p.21228-21239
Main Authors: Ding, W, Bachelot, R, Espiau de Lamaestre, R, Macias, D, Baudrion, A-L, Royer, P
Format: Article
Language:English
Subjects:
Computer Simulation
Engineering Sciences
Equipment Design
Light
Materials Testing
Nanostructures
Nanotechnology - methods
Optics
Optics and Photonics
Photonic
Scattering, Radiation
Surface Plasmon Resonance - instrumentation
Surface Plasmon Resonance - methods
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Summary:Numerical investigations based on the boundary element method (BEM) have been carried out to two-dimensional (2-D) silver dimer nano-antennas of various geometries. The near-field and far-field properties are mainly determined by the local geometry at the gap and the global shape of the antenna shafts respectively. A hybrid dimer antenna, which mixes the geometry ingredients of the rod dimer and the bowtie, benefits in both near and far field. Using a microcavity representation, the resonance in dimer nano-antennas is explained in a common and semi-analytical manner. The plasmonic enhancement and the wavelength mismatching in the optical dimer antenna are naturally embodied in this model. The quality factor of the resonance, which can be influenced by the wavelength and the geometry, is discussed intuitively. The understanding presented in this work could guide the future engineering of the optical dimer antenna.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.17.021228