25 October 2016 High-sensitivity refractive index sensor based on microfiber long period gratings with CO2 laser line-by-line inscription
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Abstract
We report a high-sensitivity refractive index sensor based on microfiber long period gratings (MLPGs) fabricated by a CO2 laser line-by-line inscription. The microfiber was fabricated by using hydrofluoric acid (HF) to etch a conventional single mode fiber (SMF). The MLPGs were fabricated by periodically tapering the microfiber with CO2-laser pulse line by line. We showed that a 45-period long period grating with about 15 dB attenuation dip can be realized in the microfiber with a diameter of ~32μm. The MLPGs were found to have a very high sensitivity to external refractive index, in which the sensitivity of the MLPGs can be 4 times than that of a normal long period grating (LPG).
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Ruji Xu, Ruji Xu, Xiaojun Zhu, Xiaojun Zhu, Chinhua Wang, Chinhua Wang, } "High-sensitivity refractive index sensor based on microfiber long period gratings with CO2 laser line-by-line inscription", Proc. SPIE 9685, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems; and Smart Structures and Materials, 968517 (25 October 2016); doi: 10.1117/12.2242631; https://doi.org/10.1117/12.2242631
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