Hydrogel based Fabry-Pérot cavity for a pH sensor

Abdullah Al Noman, Jitendra Narayan Dash, Xin Cheng, Chern Yang Leong, Hwa Yaw Tam, Changyuan Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)


A simple, reliable, and quick reactive Fabry-Pérot (FP) structure-based fiber optic pH sensor is presented. The pH-sensitive hydrogel and single-mode fiber (SMF) are placed inside a fused silica capillary to form the FP cavity. The gel thickness is characterized by the spin coating method with respect to different spin speeds. The proposed sensor shows a pH sensitivity of 0.30 nm/pH along with a fast response time of 15 s to 20 s for different pH solvents in the acidic range. Also, the temperature sensitivity of the FPI sensor is found to be -0.56 nm/°C.

Original languageEnglish
Pages (from-to)39648
Number of pages1
JournalOptics Express
Issue number26
Publication statusPublished - 21 Dec 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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