title: In-line microfluidic refractometer based on C-shaped fiber assisted photonic crystal fiber Sagnac interferometer.
abstract: We propose and demonstrate a highly sensitive in-line photonic crystal fiber (PCF) microfluidic refractometer. Ultrathin C-shaped fibers are spliced in-between the PCF and standard single-mode fibers. The C-shaped fibers provide openings for liquid to flow in and out of the PCF. Based on a Sagnac interferometer, the refractive index (RI) response of the device is investigated theoretically and experimentally. A high sensitivity of 6621 nm/RIU for liquid RI from 1.330 to 1.333 is achieved in the experiment, which agrees well with the theoretical analysis.
authors.affiliation: Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.
authors.forename: Chuang
authors.initials: C
authors.lastname: Wu
authors.forename: Ming-Leung Vincent
authors.initials: ML
authors.lastname: Tse
authors.forename: Zhengyong
authors.initials: Z
authors.lastname: Liu
authors.forename: Bai-Ou
authors.initials: BO
authors.lastname: Guan
authors.forename: Chao
authors.initials: C
authors.lastname: Lu
authors.forename: Hwa-Yaw
authors.initials: HY
authors.lastname: Tam
mesh_terms: D007368:Interferometry / Q000295:instrumentation*; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D055100:Optical Fibers; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*