White-light spectral interferometry for surface plasmon resonance sensing applications

被引：64
|
作者：
Ng, Siu Pang [1 ]
Wu, Chi Man Lawrence [1 ]
Wu, Shu Yuen [2 ]
Ho, Ho Pui [2 ]
机构：
[1] City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China
来源：
OPTICS EXPRESS | 2011年 / 19卷 / 05期
关键词：
PHASE; SENSORS; BIO;
D O I：
10.1364/OE.19.004521
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel differential phase detecting surface plasmon resonance (SPR) sensor based on white-light spectral interferometry is presented. Our proposed scheme employs a white-light source for SPR excitation and measures the corresponding SPR phase change at the optimized coupling wavelength with fixed angle of incidence across the visible spectrum. Compared to existing laser based phase detecting schemes, this system offers optimal sensitivity and extended dynamic range of measurement without any compromise in phase detection resolution. Results obtained from sodium chloride solutions indicate that the detection limit is 2.6 x 10(-7) RIU over a refractive index range of 10(-2) RIU, which is considerably wider than that achievable by existing laser based approach, thus making our scheme very attractive for practical SPR sensing applications. (C) 2011 Optical Society of America
引用
收藏
页码：4521 / 4527
页数：7
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