Low-cost high-performance fiber-optic pH sensor based on thin-core fiber modal interferometer

Bobo Gu, Ming Jie Yin, Aping Zhang, Jin Wen Qian, Sailing He

Research output: Journal article publicationJournal articleAcademic researchpeer-review

154 Citations (Scopus)


A new fiber-optic pH sensor based on a thin-core fiber modal interferometer with electrostatic self-assembled nanocoating is presented. After inserting a segment of thin-core fiber into a standard single-mode fiber, high-order cladding modes are excited and interfere with the core mode to form an in-fiber modal interferometer. The side surface of the sensor is then deposited with poly(allylamine hydrochloride) and poly(acrylic acid) nanocoating by electrostatic self-assembly technique. A fast and linear response is obtained in either acid or alkali solution (in the pH range 2.5 to 10) with resolution of 0.013 pH unit.
Original languageEnglish
Pages (from-to)22296-22302
Number of pages7
JournalOptics Express
Issue number25
Publication statusPublished - 7 Dec 2009
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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