Optical RI sensor based on an in-fiber bragg grating fabry-perot cavity embedded with a micro-channel

Zhijun Yan*, Pouneh Saffari, Kaiming Zhou, Adedotun Adebay, Lin Zhang

*Corresponding author for this work

Research output: Chapter in Book/Published conference outputConference publication


We report a linear response optical refractive index (RI) sensor, which is fabricated based on a micro-channel created within a Fabry Perot (F-P) cavity by chemical etching assisted by femtosecond laser inscription. The experimental results show the F-P resonance peak has a linear response with the RI of medium and the measuring sensitivity is proportion to the length of micro-channel. The sensor with 5 μm -long micro-channel exhibited an RI sensitivity of 1.15nm/RIU and this sensitivity increased to 9.08nm/RIU when widening the micro-channel to 35μm. Furthermore, such micro-channel FP sensors show a much broader RI sensing dynamic range (from 1.3 to 1.7) than other reported optical fiber sensors.

Original languageEnglish
Title of host publicationMicrostructured and specialty optical fibres
EditorsKyriacos Kalli, Alexis Mendez
Number of pages7
ISBN (Print)978-0-8194-9118-3
Publication statusPublished - 12 Apr 2012
EventMicrostructured and specialty optical fibres - Brussels, Belgium
Duration: 17 Apr 201219 Apr 2012

Publication series

NameSPIE proceedings
ISSN (Print)0277-786X


ConferenceMicrostructured and specialty optical fibres

Bibliographical note

Zhijun Yan; Pouneh Saffari; Kaiming Zhou; Adedotun Adebay and Lin Zhang,
"Optical RI sensor based on an in-fiber Bragg grating Fabry-Perot cavity embedded with a micro-channel", Proc. SPIE 8426, Microstructured and Specialty Optical Fibres, 842609 (June 1, 2012).

Copyright 2012. Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

DOI: http://dx.doi.org/10.1117/12.921410


  • F-P sensors
  • FBG
  • femtosecond laser
  • micro-channel
  • refractive index


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