Plasmonic nanosensor based on Fano resonance in waveguide-coupled resonators

被引：382

作者：

Lu, Hua ^{[1
]}

Liu, Xueming ^{[1
]}

Mao, Dong ^{[1
]}

Wang, Guoxi ^{[1
]}

机构：

[1] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China

来源：

OPTICS LETTERS | 2012年 / 37卷 / 18期

基金：

中国国家自然科学基金;

关键词：

INDUCED TRANSPARENCY; NANOSCALE; LINESHAPE;

D O I：

10.1364/OL.37.003780

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We propose a plasmonic nanosensor based on Fano resonance in the strong-confinement metal-dielectric-metal waveguide side-coupled with a pair of nanoresonators. Due to the coherent interference of the splitting discrete and quasi-continuum modes, the reflection spectrum possesses a sharp asymmetric Fano resonance dip, which is dependent on the cavity-cavity phase and the refractive index change of the dielectric. The physical features contribute to a highly efficient plasmonic sensor for refractive index sensing. The nanosensor yields a sensitivity of similar to 900 nm/RIU and a figure of merit of similar to 500, remarkable values compared with those of plasmonic sensors supported by perfect absorbers. (C) 2012 Optical Society of America

引用

页码：3780 / 3782

页数：3

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