title: Compressible fiber optic micro-Fabry-Pérot cavity with ultra-high pressure sensitivity.
abstract: We propose and demonstrate a pressure sensor based on a micro air bubble at the end facet of a single mode fiber fusion spliced with a silica tube. When immersed into the liquid such as water, the air bubble essentially acts as a Fabry-Pérot interferometer cavity. Such a cavity can be compressed by the environmental pressure and the sensitivity obtained is >1000 nm/kPa, at least one order of magnitude higher than that of the diaphragm-based fiber-tip sensors reported so far. The compressible Fabry-Pérot interferometer cavity developed is expected to have potential applications in highly sensitive pressure and/or acoustic sensing.
authors.affiliation: Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: D N
authors.initials: DN
authors.lastname: Wang
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.forename: Tianyi
authors.initials: T
authors.lastname: Hu
mesh_terms: D019245:Compressive Strength; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008904:Miniaturization; D012031:Refractometry / Q000295:instrumentation*; D014160:Transducers, Pressure