A refractive index (RI) sensor manufactured on a tapered hole-assisted dual-core fiber (HADCF) is proposed. The sensor is manufactured by tapered HADCF between two single-mode optical fibers, and works based on the coupling between the fundamental mode (LP01) and the low-order mode (LP11) in two cores. HADCF is tapered to achieve the phase matching condition between the LP01 mode in the centric core and the LP11 mode in the suspended core. The air hole in HADCF forms microfluidic channels for injecting glycerol solution, and can be free from external interference. The shift of the coupling peak is linear with the RI and sensitivity is 924.57 nm/RIU. In addition, the proposed RI sensor has negligible temperature crosstalk.
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