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An optical microﬁber coupler-based refractive index sensor is proposed and experimentally demonstrated in this letter. A microﬁber coupler with a minimum diameter of 2.5 µm and a uniform waist with a length of 2 mm is fabricated and used for sensing surrounding refractive index. Both theoretical and experimental results have shown that the spectral response of the proposed microﬁber coupler is highly sensitive to the surrounding refractive index over the range from 1.3340 to 1.3800. An average sensitivity of 2723 nm/RIU over this entire refractive index range has been achieved experimentally. Furthermore, for the refractive index range from 1.3340 to 1.3515,
Bo, L. et al. (2013) High Sensitivity Fiber Refractometer Based on an Optical Microfiber Coupler. IEEE Photonics Technology Letters, Vol. 25, no.3. doi:10.1109/LPT.2012.2234449
International Centre for Graduate Education in Micro and Nano Engineering, Irish Research Council, European Union Marie-Cuyreie Actions under FP7, National Access Program, Tyndall national Institute.