Optimization of Surface Plasmon Resonance Biosensor with Ag/Au Multilayer Structure and Fiber-Optic Miniaturization

Abstract

In this paper, we report a novel wavelength interrogation-based surface plasmon resonance (SPR) system, in which a film of three Ag layers and three Au layers are alternately deposited on a Kretschmann configuration as sensing element. This multilayer film shows higher sensitivity for refractive index (RI) measurement by comparing with single Au layer structure, which is consistent with its theoretical calculation. A sensitivity range of 2056–5893 nm/RIU can be achieved, which is comparable to RI sensitivities of other wavelength-modulated SPR sensors. Compared with Ag film, this Ag/Au multilayer arrangement offers anti-oxidant protection. This SPR biosensor based on a cost-effective Ag/Au multilayer structure is applicable to the real-time detection of specific interactions and dissociation of low protein concentrations. To extend the application of this highly-sensitive metal film device, we integrated this concept on an optical fiber. The range of RI sensitivities with Ag/Au multilayer was 1847–3309 nm/RIU. This miniaturized Ag/Au multilayer-based fiber optic sensor has a broad application in chemical and biological sensing.

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Acknowledgments

The authors would like to thank the National Nature Science Foundation of China (Grant Nos. 11474043, 61520106013, and 61137005), the Doctoral Scientific Fund Project of the State Education Committee of China (Grant No. SRFDP- 20120041110040), and the Natural Science and Engineering Research Council of Canada (Grant No. RGPIN-2016-03864) for financial support.

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Correspondence to Wei Peng.

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Lu, M., Liang, Y., Qian, S. et al. Optimization of Surface Plasmon Resonance Biosensor with Ag/Au Multilayer Structure and Fiber-Optic Miniaturization. Plasmonics 12, 663–673 (2017). https://doi.org/10.1007/s11468-016-0312-4

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Keywords

  • Surface plasmon
  • Sensors
  • Optical sensing and sensors
  • Biological sensing and sensors