title: In-line optofluidic refractive index sensing in a side-channel photonic crystal fiber.
abstract: An in-line optofluidic refractive index (RI) sensing platform is constructed by splicing a side-channel photonic crystal fiber (SC-PCF) with side-polished single mode fibers. A long-period grating (LPG) combined with an intermodal interference between LP01and LP11core modes is used for sensing the RI of the liquid in the side channel. The resonant dip shows a nonlinear wavelength shift with increasing RI over the measured range from 1.3330 to 1.3961. The RI response of this sensing platform for a low RI range of 1.3330-1.3780 is approximately linear, and exhibits a sensitivity of 1145 nm/RIU. Besides, the detection limit of our sensing scheme is improved by around one order of magnitude by introducing the intermodal interference.
authors.forename: Nan
authors.initials: N
authors.lastname: Zhang
authors.forename: Georges
authors.initials: G
authors.lastname: Humbert
authors.forename: Zhifang
authors.initials: Z
authors.lastname: Wu
authors.forename: Kaiwei
authors.initials: K
authors.lastname: Li
authors.forename: Perry Ping
authors.initials: PP
authors.lastname: Shum
authors.forename: Nancy Meng Ying
authors.initials: NM
authors.lastname: Zhang
authors.forename: Ying
authors.initials: Y
authors.lastname: Cui
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Auguste
authors.forename: Xuan Quyen
authors.initials: XQ
authors.lastname: Dinh
authors.forename: Lei
authors.initials: L
authors.lastname: Wei