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A refractive index (RI) sensor which based on an S-tapered fiber probe (STFP) with a silver mirror on its end facet is demonstrated. The fiber probe has a compact size of about 1 mm, making it proper for sensing in narrow or limited space. It is stiff to bend due to the short probe structure, leading to avoid the cross-sensitivity of bending. The reflection spectra of the STFPs with different structure length have been analyzed and simulated. A proper structure length will result in narrow dips and peaks, which can be used to enhance the measurement accuracy. Its refractive index sensitivity which is normally in the range of 1.332~1.387 reaches 268.8 nm/RI unit, which is 9 times higher than that of the existing reflective fiber-taper-based RI sensor. Furthermore, the thermal response experimental results show that the STFP is temperature insensitive.
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