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

doi:10.1117/12.921410

25 April 2012 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

Proceedings Volume 8426, Microstructured and Specialty Optical Fibres; 842609 (2012) https://doi.org/10.1117/12.921410
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

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.

Citation Download Citation

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 (25 April 2012); https://doi.org/10.1117/12.921410

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