Cavity-enhanced surface-plasmon resonance sensing: modeling and performance

被引：3
|
作者：
Giorgini, A. [1 ]
Avino, S. [1 ]
Malara, P. [1 ]
Zullo, R. [1 ]
Gagliardi, G. [1 ]
Homola, J. [2 ]
De Natale, P. [3 ]
机构：
[1] INO, Consiglio Nazl Ric, I-80078 Naples, Italy
[2] Inst Photon & Elect, Prague 18251, Czech Republic
[3] INO, Consiglio Nazl Ric, I-50125 Florence, Italy
来源：
MEASUREMENT SCIENCE AND TECHNOLOGY | 2014年 / 25卷 / 01期
关键词：
optical sensors; refractive-index measurement; surface-plasmon resonance; optical resonators; cavity ring-down spectroscopy; ABSORPTION-MEASUREMENTS; SPECTROSCOPY;
D O I：
10.1088/0957-0233/25/1/015205
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We investigate the performance of a surface-plasmon-resonance refractive-index (RI) sensor based on an optical resonator. The resonator transforms RI changes of liquid samples, interacting with the surface plasmon excited by near-infrared light, into a variation of the intra-cavity optical loss. Cavity ring-down measurements are provided as a proof of concept of RI sensing on calibrated mixtures. A characterization of the overall sensor response and noise features as well as a discussion on possible improvements is carried out. A reproducibility analysis shows that a resolution of 10(-7)-10(-8) RIU is within reach over observation times of 1-30 s. The ultimate resolution is set only by intrinsic noise features of the cavity-based method, pointing to a potential limit below 10(-10) RIU/root Hz.
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页数：5
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