In-line microfluidic refractometer based on C-shaped fiber assisted photonic crystal fiber Sagnac interferometer

Chuang Wu, Ming Leung Vincent Tse, Zhengyong Liu, Bai Ou Guan, Chao Lu, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

49 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)3283-3286
Number of pages4
JournalOptics Letters
Issue number17
Publication statusPublished - 1 Sep 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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