Ultrasensitive refractive index sensor based on enhanced Vernier effect through cascaded fiber core-offset pairs

An ultrasensitive refractive index (RI) sensor based on enhanced Vernier effect is proposed, which consists of two cascaded fiber core-offset pairs. One pair functions as a Mach-Zehnder interferometer (MZI), the other with larger core offset as a low-finesse Fabry-Perot interferometer (FPI). In trad...

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Veröffentlicht in:Optics express 2020-02, Vol.28 (3), p.4145-4155
Hauptverfasser: Li, Jiewen, Zhang, Meng, Wan, Minggui, Lin, Chunli, Huang, Shihong, Liu, Cuihong, He, Qingping, Qiu, Xiaozhong, Fang, Xiaohui
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container_end_page 4155
container_issue 3
container_start_page 4145
container_title Optics express
container_volume 28
creator Li, Jiewen
Zhang, Meng
Wan, Minggui
Lin, Chunli
Huang, Shihong
Liu, Cuihong
He, Qingping
Qiu, Xiaozhong
Fang, Xiaohui
description An ultrasensitive refractive index (RI) sensor based on enhanced Vernier effect is proposed, which consists of two cascaded fiber core-offset pairs. One pair functions as a Mach-Zehnder interferometer (MZI), the other with larger core offset as a low-finesse Fabry-Perot interferometer (FPI). In traditional Vernier-effect based sensors, an interferometer insensitive to environment change is used as sensing reference. Here in the proposed sensor, interference fringes of the MZI and the FPI shift to opposite directions as ambient RI varies, and to the same direction as surrounding temperature changes. Thus, the envelope of superimposed fringe manifests enhanced Vernier effect for RI sensing while reduced Vernier effect for temperature change. As a result, an ultra-high RI sensitivity of -87261.06 nm/RIU is obtained near the RI of 1.33 with good linearity, while the temperature sensitivity is as low as 204.7 pm/ °C. The proposed structure is robust and of low cost. Furthermore, the proposed scheme of enhanced Vernier effect provides a new perspective and idea in other sensing field.
doi_str_mv 10.1364/OE.384815
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title Ultrasensitive refractive index sensor based on enhanced Vernier effect through cascaded fiber core-offset pairs
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