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Proceedings Paper

Optical RI sensor based on an in-fiber Bragg grating Fabry-Perot cavity embedded with a micro-channel
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Paper Abstract

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.

Paper Details

Date Published: 25 April 2012
PDF: 7 pages
Proc. SPIE 8426, Microstructured and Specialty Optical Fibres, 842609 (25 April 2012); doi: 10.1117/12.921410
Show Author Affiliations
Zhijun Yan, Aston Univ. (United Kingdom)
Pouneh Saffari, Aston Univ. (United Kingdom)
Kaiming Zhou, Aston Univ. (United Kingdom)
Adedotun Adebay, Aston Univ. (United Kingdom)
Lin Zhang, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 8426:
Microstructured and Specialty Optical Fibres
Kyriacos Kalli; Alexis Mendez, Editor(s)

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