Sensitivity and linearity enhanced wide-detection range surface-plasmon-resonance photonic-crystal-fiber sensor

•A wide detection range RI SPR-PCF sensor is proposed and demonstrated.•The sensor is suitable for the detection of the RI in the range from 1.15 to 1.45.•The performance of the sensor is optimized via changing the structural parameters.•The maximum sensitivity for alcohol RI-detection is −6116 nm/R...

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Bibliographic Details
Published in:Results in physics 2021-10, Vol.29, p.104707, Article 104707
Main Authors: Xie, Dehuai, Zhang, Haiwei, Wang, Guangyao, Xue, Lifang, Yang, Xiaoping, Shi, Wei, Yao, Jianquan
Format: Article
Language:English
Subjects:
Alcohol concentration
Photonic crystal fiber
Refractive-index sensor
Surface plasmon resonance
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Summary:•A wide detection range RI SPR-PCF sensor is proposed and demonstrated.•The sensor is suitable for the detection of the RI in the range from 1.15 to 1.45.•The performance of the sensor is optimized via changing the structural parameters.•The maximum sensitivity for alcohol RI-detection is −6116 nm/RIU.•The maximum corresponding R2 for RI-detection is 0.9993. A refractive-index (RI) sensor based on photonic crystal fiber (PCF) and surface plasmon resonance (SPR) is proposed and demonstrated in this paper. The influences induced by the changes of the diameter of gold nanowire, air-hole spacing, diameter of central hole and diameter of the air hole on both sides of central hole are investigated to analyze and optimize the performances of the SPR-PCF sensor. It is indicated that the proposed sensor is suitable for the detection of the RI of material in the range from 1.15 to 1.45. Moreover, the optimized RI sensitivity can reach −5893.9 nm/RIU and the optimized R2 can be larger than 0.999. Detections of the alcohol with different concentrations are carried out to demonstrate the performance of the SPR-PCF. The sensitivities in both polarization directions are −192 nm/% and −198 nm/% when the concentration is changed from 10% to 87%. Moreover, the sensitivities for RI-detection are −5900 nm/RIU and −6116 nm/RIU with the corresponding R2 larger than 0.9993 in both polarization-directions. Our detailed results will help to understand the SPR phenomenon in hexagonal PCF, and promote the realization and application of SPR-PCF sensors.
ISSN:2211-3797
2211-3797
DOI:10.1016/j.rinp.2021.104707