Tunable Fano resonances and plasmonic hybridization of gold triangle-rod dimer nanostructure

doi:10.1088/1674-1056/25/5/057303

Abstract A gold dimer structure consisting of a notched triangle nanoslice and a rectangle nanorod is proposed to produce distinct Fano resonance. Owing to the coupling between the dipole plasmon mode of the nanorod and the dipole or quadrupole plasmon mode of the nanoslice, the extinction spectrum with a deep Fano dip is formed and can be well fitted by the Fano interference model for different geometry parameters. In addition, Fano resonance of the gold dimer nanostructure also intensely depends on the polarization direction of incident light. Moreover, Fano resonance of the triangle-rod trimer is also analyzed by adding another nanorod into the former dimer and exhibits the splitting of plasmonic resonant peak in high order coupling modes. The plasmonic hybridizations in these nanostructures have been analyzed for revealing the physical origin of the Fano resonance.

Keywords: surface plasmon Fano resonance dimer trimer

Received: 10 November 2015
Revised: 13 January 2016
Accepted manuscript online:

PACS:	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	52.35.Mw	(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
	87.85.fk	(Biosensors)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61275153) and the Natural Science Foundation of Zhejiang Provice, China (Grant No. LY12A04002).

Corresponding Authors: Meng Huang
E-mail: xdxhuang@163.com

Cite this article:

Meng Huang(黄萌), Dong Chen(陈栋), Li Zhang(张利), Jun Zhou(周骏) Tunable Fano resonances and plasmonic hybridization of gold triangle-rod dimer nanostructure 2016 Chin. Phys. B 25 057303

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Tunable Fano resonances and plasmonic hybridization of gold triangle-rod dimer nanostructure

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