19 February 2015 High-sensitivity Mach-Zehnder interferometric refractive index sensor based on two different ultra-abrupt tapers
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Proceedings Volume 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014); 94491X (2015) https://doi.org/10.1117/12.2074872
Event: The International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference (icPOE 2014), 2014, Xi'an, China
Abstract
A high-sensitivity Mach-Zehnder(MZ) interferometric refractive index(RI) sensor based on two different ultra-abrupt tapers is proposed and demonstrated experimentally. The whole fabrication process is relatively simple. One taper is fabricated by the fusion-splicing method and the ratio of the waist diameter to the taper length is 1:1. The other taper is fabricated by CO2 laser irradiation with a ratio around 1:10. According to the experimental results, the spectral loss of the proposed MZ interferometric sensor has a linear response to the external RI change with a ultrahigh sensitivity of -412.02138 dB/RIU(refractive index unit) in the range of 1.3505-1.3684. The sensor has the potential application for RI measurement in chemical or biochemical sensing fields due to its low cost, simple structure and extremely high sensitivity.
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Xiufeng Shen, Xiufeng Shen, Le Xu, Le Xu, Sumei Wang, Sumei Wang, } "High-sensitivity Mach-Zehnder interferometric refractive index sensor based on two different ultra-abrupt tapers", Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 94491X (19 February 2015); doi: 10.1117/12.2074872; https://doi.org/10.1117/12.2074872
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