Tunable Fano resonances in heterogenous Al-Ag nanorod dimers

被引：22

作者：

Ci, Xueting ^{[1
]}

Wu, Botao ^{[1
]}

Song, Min ^{[1
]}

Liu, Yan ^{[1
]}

Chen, Gengxu ^{[1
]}

Wu, E. ^{[1
]}

Zeng, Heping ^{[1
]}

机构：

[1] E China Normal Univ, State Key Lab Precis Spect, Shanghai 200062, Peoples R China

来源：

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2014年 / 117卷 / 02期

基金：

高等学校博士学科点专项科研基金;

关键词：

AU;

D O I：

10.1007/s00339-014-8479-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We theoretically investigate the plasmonic coupling in heterogenous Al-Ag nanorod dimers. A pronounced Fano dip is found in the extinction spectrum produced by the destructive interference between the bright dipole mode from a short Al nanorod and the dark quadrupole mode from a long Ag nanorod nearby. This Fano resonance can be widely tuned in both wavelength and amplitude by varying the rod dimensions and end geometry, the separation distance and the local dielectric environment. The Al-Ag heterogeneous nanorod dimer shows a high sensitivity to the surrounding environment with a local surface plasmon resonance figure of merit of 7.0, which enables its promising applications in plasmonic sensing and detection.

引用

页码：955 / 960

页数：6

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