Journal
RESULTS IN PHYSICS
Volume 18, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.rinp.2020.103240
Keywords
PCF-SPR; Series-wound structure; Near-infrared; Low refractive index
Funding
- National Natural Science Foundation of China [51474069, 41472126]
- China Postdoctoral Science Foundation [2016M591510]
- Natural Science Foundation of Heilongjiang Province [E2017010]
- City University of Hong Kong Strategic Research Grant (SRG) [7005105, 7005265]
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To achieve sensing of low refractive indexes (RIs) in the near-infrared region, a novel series-wound structure with dual gold nanowires is designed and the photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) is investigated. Numerical simulation by the finite element method (FEM) reveals that the odd mode for y-polarization has better sensing properties due to the more prominent shift of the confinement loss peak. The PCF-SPR sensor can realize a broad range of detection for low RIs changing from 1.13 to 1.35. The maximum spectral sensitivity of 17500 nm/RIU and optimal resolution of 5.71 x 10(-6) RIU are observed for RIs between 1.34 and 1.35. Thus, the proposed sensor can be applied in environmental engineering, biochemical analysis and healthcare fields due to its ultrahigh sensitivity for analytes with low RIs in the near-infrared region and fabrication simplicity.
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