title: High-sensitivity, evanescent field refractometric sensor based on a tapered, multimode fiber interference.
abstract: We propose and experimentally demonstrate an enhanced evanescent field fiber refractometer based on a tapered multimode fiber sandwiched between two single-mode fibers. Experiments show that this fiber sensor offers ultrahigh sensitivity [better than 1900 nm/RIU at a refractive index (RI) of 1.44] for RI measurements within the range of 1.33-1.44, in agreement with the theoretical predictions. This is the highest value reported to date (to our knowledge) in the literature.
authors.affiliation: Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK. pw3y09@orc.soton.ac.uk
authors.forename: Pengfei
authors.initials: P
authors.lastname: Wang
authors.forename: Gilberto
authors.initials: G
authors.lastname: Brambilla
authors.forename: Ming
authors.initials: M
authors.lastname: Ding
authors.forename: Yuliya
authors.initials: Y
authors.lastname: Semenova
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wu
authors.forename: Gerald
authors.initials: G
authors.lastname: Farrell
mesh_terms: D055100:Optical Fibers; D012031:Refractometry / Q000295:instrumentation*