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|Title:||Influence of plasmon destructive interferences on optical properties of gold planar quadrumers|
|Source:||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. https://doi.org/10.1088/0957-4484/22/24/245204|
|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.|
|Appears in Collections:||Staff Publications|
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