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

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

中国物理B ›› 2017, Vol. 26 ›› Issue (12): 127301-127301.doi: 10.1088/1674-1056/26/12/127301

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

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

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)

1. Institute of Photonics, Faculty of Science, Ningbo University, Ningbo 315211, China;
2. School of Photoelectric Engineering, Changchun University of Science and Technology, Changchun 130022, China;
3. School of Computer Science and Telecommunication Engineering, Jiangsu University, Zhenjiang 212013, China;
4. School of Sciences, Nantong University, Nantong 226007, China

收稿日期:2017-06-04 修回日期:2017-08-03 出版日期:2017-12-05 发布日期:2017-12-05
通讯作者: Jun Zhou E-mail:zhoujun@nbu.edu.cn
基金资助:
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.

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

Han-Hua Zhong(钟汉华)¹, Jian-Hong Zhou(周见红)², Chen-Jie Gu(顾辰杰)¹, Mian Wang(王勉)¹, Yun-Tuan Fang(方云团)³, Tian Xu(许田)⁴, Jun Zhou(周骏)¹

1. Institute of Photonics, Faculty of Science, Ningbo University, Ningbo 315211, China;
2. School of Photoelectric Engineering, Changchun University of Science and Technology, Changchun 130022, China;
3. School of Computer Science and Telecommunication Engineering, Jiangsu University, Zhenjiang 212013, China;
4. School of Sciences, Nantong University, Nantong 226007, China

Received:2017-06-04 Revised:2017-08-03 Online:2017-12-05 Published:2017-12-05
Contact: Jun Zhou E-mail:zhoujun@nbu.edu.cn
Supported by:
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.

摘要/Abstract

摘要： 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.

关键词: Fano resonance, plasmon hybridization, finite element method

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.

Key words: Fano resonance, plasmon hybridization, finite element method

中图分类号: (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))

73.20.Mf

73.22.Lp (Collective excitations) 81.07.-b (Nanoscale materials and structures: fabrication and characterization)

钟汉华, 周见红, 顾辰杰, 王勉, 方云团, 许田, 周骏. Characteristics and mechanism analysis of Fano resonances in Π-shaped gold nano-trimer[J]. 中国物理B, 2017, 26(12): 127301-127301.

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[J]. Chin. Phys. B, 2017, 26(12): 127301-127301.

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

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

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