A multi-functional plasmonic biosensor

被引：74

作者：

Chang, Yun-Tzu ^{[1
]}

Lai, Yueh-Chun ^{[1
]}

Li, Chung-Tien ^{[1
]}

Chen, Cheng-Kuang ^{[1
]}

Yen, Ta-Jen ^{[1
,2
]}

机构：

[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan

[2] Natl Tsing Hua Univ, Inst NanoEngn & MicroSyst, Hsinchu 30013, Taiwan

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 09期

关键词：

RESONANCE;

D O I：

10.1364/OE.18.009561

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present a coupler-free, multi-mode refractive index sensor based on nanostructured split ring resonators (SRRs). The fabricated SRR structures exhibit multiple reflectance peaks, whose spectral positions are sensitive to local dielectric environment and can be quantitatively described by our standing-wave plasmonic resonance model, providing a design rule for this multi-mode refractive-index (MMRI) sensor. We further manifest that the lower-order modes possess greater sensitivity associated with stronger localized electromagnetic field leading to shorter detection lengths within five hundreds nanometers, while the higher-order modes present mediate sensitivity with micron-scale detection lengths to allow intracellular bio-events detection. These unique merits enable the SRR-based sensor a multi-functional biosensor and a potential label-free imaging device. (C) 2010 Optical Society of America

引用

页码：9561 / 9569

页数：9

共 28 条

[1] Electric and magnetic responses in the multiple-split ring resonators by electric excitation [J].