Characteristics and mechanism analysis of Fano resonances in Π-shaped gold nano-trimer

doi:10.1088/1674-1056/26/12/127301

Abstract Fano interference of metallic nanostructure is an effective way to reduce the irradiation loss and improve the spectral resolution. A Π-shaped gold nano-trimer, which is composed of a gold nanorod and two gold nanorices, is presented to investigate the properties of Fano resonances in the visible spectrum by using the finite element method (FEM). The theoretical analysis demonstrates that the Fano resonance of the Π-shaped gold nano-trimer is attributed to the near-field interaction between the bright mode of the nanorice pair and the dark quadrupole mode of the nanorod. Furthermore, by breaking the geometric symmetry of the nanostructure the line-shape spectrum with double Fano resonances of Π-shaped gold nano-trimer is obtained and exhibits structure-dependent and medium-dependent characteristics. It is a helpful strategy to design a plasmonic nanostructure for implementing multiple Fano resonances in practical applications.

Keywords: Fano resonance plasmon hybridization finite element method

Received: 04 June 2017
Revised: 03 August 2017
Accepted manuscript online:

PACS:	73.20.Mf	(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
	73.22.Lp	(Collective excitations)
	81.07.-b	(Nanoscale materials and structures: fabrication and characterization)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61320106014, 61675104, and 11474041), the Open Fund of Key Subject of Zhejiang Province, China (Grant Nos. xkzwl12, xkzwl1521, and xkzwl1522), and Ningbo University, China.

Corresponding Authors: Jun Zhou
E-mail: zhoujun@nbu.edu.cn

Cite this article:

Han-Hua Zhong(钟汉华), Jian-Hong Zhou(周见红), Chen-Jie Gu(顾辰杰), Mian Wang(王勉), Yun-Tuan Fang(方云团), Tian Xu(许田), Jun Zhou(周骏) Characteristics and mechanism analysis of Fano resonances in Π-shaped gold nano-trimer 2017 Chin. Phys. B 26 127301

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Characteristics and mechanism analysis of Fano resonances in Π-shaped gold nano-trimer

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