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25 April 2012 Optical RI sensor based on an in-fiber Bragg grating Fabry-Perot cavity embedded with a micro-channel
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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.
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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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