光谱学与光谱分析 |
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Performance of Wavelength Modulation Surface Plasmon Resonance Biosensor |
LUO Yun-han1, XU Meng-yun1, CHEN Xiao-long1, TANG Jie-yuan1, WANG Fang1, ZHANG Yi-long2, HE Yong-hong2, CHEN Zhe1* |
1. Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China 2. Laboratory of Optical Imaging and Sensing, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China |
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Abstract Surface plasmon resonance (SPR) is a rapid, label-free, high-precision technique of biological sensing and analysis. The investigation on the characteristics of provides theoretical basis and instructions for the applications of SPR. A Kretschmann-structure surface plasmon resonance (SPR) biosensor based on wavelength modulation was developed, and also its sensing performances in the bulk solution was investigated. Measurements with different concentrations of bulk ethanol and ethylene glycol solutions show that the resonant wavelength shows a low sensitivity, but a higher linear response to the change in refractive index (RI), when RI is relatively smaller. With increasing refractive index , the sensitivity of resonance wavelength to changes in the refractive index increases. In the refractive index range of 1.407 0~1.430 RIU, sensitivity reaches to 11 487 nm·RIU-1. The sensor resonance wavelength stability is 0.213 8 nm, and the minimum resolution of refractive index approaches to 10-6 RIU. The advantages of the surface plasmon resonance sensor developed here results in simple operation, high sensitivity, wide detection range, low resolution, makes it an important candidate in chemical and biological sensing.
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Received: 2013-11-06
Accepted: 2014-02-17
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Corresponding Authors:
CHEN Zhe
E-mail: thzhechen@163.com
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