Abstract
A fiber/Ag-Cu films surface plasmon resonance (SPR) refractive index (RI) sensor composed of multimode fiber-no-core-fiber-multimode fiber (MMF-NCF-MMF) structure is designed. The sensing region length and Cu film deposition time of sensor are gradually optimized by the control variable method, which finally achieves the improvement of sensor properties. We experimentally compared the sensing performance of the fiber/Ag film and fiber/Ag-Cu films sensor. Experimental results show that the fiber/Ag-Cu films sensor has good linearity (R-square = 0.993), and its sensitivity is as high as 3957 nm/RIU in the refractive index detection range of 1.3328–1.3853, which is 1109 nm/RIU higher than the sensitivity of a conventional fiber/Ag film sensor. The sensor presented in this paper adopts the structure with composite metal film, which outperforms the common single-layer metal film in chemical stability such as oxidation resistance and mechanical hardness. Meanwhile, the SPR sensor with MMF-NCF-MMF structure has the advantages of convenient manufacture and compact structure. In conclusion, it can bestow a unique advantage in the field of biological detection or chemical analysis.
Highlights
With the rapid development of technology and the continuous improvement of people’s quality of life, the demand for high-performance and easy to integrate sensors is increasingly urgent
Based on this scientific issue, we proposed a high-sensitivity surface plasmon resonance (SPR) refractive index sensor based on no-core fiber with Ag-Cu composite films
Three groups of fiber/Ag film SPR sensors with different lengths were placed in glucose solution that has a refractive index of 1.3328 for sensing experiments, respectively
Summary
With the rapid development of technology and the continuous improvement of people’s quality of life, the demand for high-performance and easy to integrate sensors is increasingly urgent. As the requirements for detection accuracy of various detection technologies are gradually increasing, how to further improve the performance has become a major challenge in the field of SPR optical sensors To overcome this challenge, a conventional processing method is to change the symmetric structure of fiber using micro-operating platforms, such as the proposed U-type fiber sensors [13] and etched fiber sensors [14]. The fiber becomes very fragile due to the mechanical strength of fiber being damaged in the process of sensor manufacturing, which is not conducive to subsequent practical applications and preservation [20] Based on this scientific issue, we proposed a high-sensitivity SPR refractive index sensor based on no-core fiber with Ag-Cu composite films. The sensor has broad application prospects in the field of refractive index detection for industrial production and environmental monitoring
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