Abstract
A surface plasmon resonance fiber sensor on the basis of hollow silica capillary (HSC) is theoretically proposed and experimentally demonstrated. Numerical analysis indicates that the structure of multimode–capillary–multimode fiber (MMF–HSC–MMF) possesses high spectral resolution and sensitivity due to the existence of capillary stomata. A 55-nm-thick gold-coated HSC is experimentally implemented, with an average refractive index (RI) sensitivity of 6352.16 nm/RIU in RI range of 1.396–1.423. Taking advantage of high thermal coefficient of PDMS, the gold-coated section thoroughly covered with PDMS is especially sensitive to temperature changes. When monitoring the temperature variations of 5–80 °C, the sensor shows high sensitivity (− 2.067 nm/°C) and high linearity (R2 = 0.9981).
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This work is supported by the project of the National Natural Science Foundation of China (no. 61775065).
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Yang, Z., Xia, L., Xia, J. et al. Compact and highly sensitive temperature sensor established with HSC-SPR embedded in a polymer. Appl. Phys. B 126, 156 (2020). https://doi.org/10.1007/s00340-020-07505-5
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DOI: https://doi.org/10.1007/s00340-020-07505-5