Improved sensitivity in a T-shaped nanodimer plasmonic sensor

被引：12

作者：

Xi, Zheng ^{[1
]}

Lu, Yonghua ^{[1
]}

Yu, Wenhai ^{[1
]}

Wang, Pei ^{[1
]}

Ming, Hai ^{[1
]}

机构：

[1] Univ Sci & Technol China, Inst Photon, Dept Opt & Opt Engn, Hefei 230026, Anhui, Peoples R China

来源：

JOURNAL OF OPTICS | 2013年 / 15卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Fano resonance; plasmonics; sensing; NEAR-FIELD ENERGY; FANO RESONANCES; NANOROD;

D O I：

10.1088/2040-8978/15/2/025004

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Fano resonance can exist in a T-shaped nanodimer due to interaction between the bright mode of the short nanoparticle and the dark mode of the long nanoparticle. The coupling between the bright and dark modes is studied in detail and compared with a line-shaped nanodimer. The coupling strength of the T-shaped nanodimer is enhanced due to the high density of localized electromagnetic states. It is found that the enhanced coupling strength in the T-shaped nanodimer can improve the sensitivity of the system. The different spectral responses to different spatial locations of the T-shaped nanodimer provide an effective way to monitor refractive index changes both spectrally and spatially.

引用

页数：4

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