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29 April 2016 Coreless side polished fiber as ultra-sensitive refractive index sensor
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A novel type of coreless side-polished fiber (CSPF) was investigated numerically and experimentally for sensing refractive index (RI). Numerical simulations and experiments found that multi-mode interference can be excited at the transitional section of coreless side-polished fiber, leading to resonant dips in transmission spectrum through such a CSPF. A red shift of such dips was observed due to increase in surrounding RI, whereby the CSPF can be used as RI sensor. Interestingly, by such a simple CSPF structure, ultra-high sensitivity of 7225nm/RIU for RI range of 1.432 to 1.434 was achieved in our experiment. As the CSPF can act as a versatile platform, the high sensitivity of the CSPF will open new opportunities for other high sensitive sensors and fiber devices.
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Huazhuo Dong, Junwen Guan, Jianhui Yu, Huihui Lu, Yunhan Luo, Jun Zhang, Zhe Chen, and Zhuoqi Wu "Coreless side polished fiber as ultra-sensitive refractive index sensor", Proc. SPIE 9899, Optical Sensing and Detection IV, 98992S (29 April 2016);

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