Open AccessIn-line optofluidic refractive index sensing in a side-channel photonic crystal fiber
Author(s) -
Nan Zhang,
Georges Humbert,
Zhifang Wu,
Kaiwei Li,
Perry Ping Shum,
Nancy Meng Ying Zhang,
Ying Cui,
JeanLouis Auguste,
Xuan Quyen Dinh,
Lei Wei
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.027674
Subject(s) - photonic crystal fiber , optics , materials science , refractive index , fusion splicing , interference (communication) , grating , optical fiber , graded index fiber , wavelength , core (optical fiber) , optoelectronics , channel (broadcasting) , fiber optic sensor , physics , telecommunications , computer science
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 LP 01 and LP 11 core 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.