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Title: Influence of plasmon destructive interferences on optical properties of gold planar quadrumers
Authors: Rahmani, M.
Tahmasebi, T.
Lin, Y.
Lukiyanchuk, B.
Liew, T.Y.F. 
Hong, M.H. 
Issue Date: 17-Jun-2011
Citation: Rahmani, M., Tahmasebi, T., Lin, Y., Lukiyanchuk, B., Liew, T.Y.F., Hong, M.H. (2011-06-17). Influence of plasmon destructive interferences on optical properties of gold planar quadrumers. Nanotechnology 22 (24) : -. ScholarBank@NUS Repository.
Abstract: Arrays of planar symmetric gold quadrumers consisting of a central nano-disc surrounded by three similar nano-discs belonging to the D3h point group were designed and fabricated. Since the geometrical configuration of quadrumers is the same as planar trigonal molecules, nano-discs can play the roles of artificial atoms to study the coupling trends among them. The plasmonic properties of the nano-disc structures are investigated by reflection spectrum measurement and finite-difference time-domain calculation with good agreement. Plasmon interaction among the nano-discs is also studied via a mass-spring coupled oscillator model. A pronounced Fano resonance (FR) is observed for the fabricated nano-discs with inter-disk gaps of around 18nm during light irradiation at normal incidence. Although the obtained FR is independent of the excitation polarization, the near-field energy spatial distribution can be flexibly tuned by the polarization direction. This has potential applications in nano-lithography, optical switching and nonlinear spectroscopy. © 2011 IOP Publishing Ltd.
Source Title: Nanotechnology
ISSN: 09574484
DOI: 10.1088/0957-4484/22/24/245204
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