title: Strain force sensor with ultra-high sensitivity based on fiber inline Fabry-Perot micro-cavity plugged by cantilever taper.
abstract: A strain force sensor based on fiber inline Fabry-Perot (FP) micro-cavity plugged by cantilever taper was proposed. The structure was fabricated by simple and cost-effective method only including fiber cleaving, tapering and splicing. The active-length of the FP micro-cavity reached 1360 µm, while the interference length was only 3.5 µm. Owing to the ultra-long active-length and ultra-short interference length, the strain force sensitivity of the fiber inline FP micro-cavity plugged by cantilever taper reached as high as 841.59 nm/N. Besides, the proposed structure showed good linearity (99.9%) in the sensing process and small temperature crosstalk (11 pm/ ̊C). It can be used as a practical and reliable strain force sensor.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Changpeng
authors.initials: C
authors.lastname: Lang
authors.forename: Xiaocun
authors.initials: X
authors.lastname: Wei
authors.forename: Shiliang
authors.initials: S
authors.lastname: Qu