Magnetic field sensor based on a combination of a microfiber coupler covered with magnetic fluid and a Sagnac loop

Fangfang Wei, Arun Kumar Mallik, Dejun Liu, Qiang Wu, Gang-Ding Peng, Gerald Farrell, Yuliya Semenova

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47 Citations (Scopus)
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Abstract

This paper proposes a novel magnetic field sensor based on a microfiber coupler (MFC) combined with a magnetic fluid (MF) in a Sagnac loop formed from a polarization maintaining fiber (PMF). Thanks to the small (~2.6 μm) waist diameter of the MFC, the resulting interference is strongly influenced by the presence of the MF and this leads to the desirable high sensitivity of the structure to the applied magnetic field. The maximum magnetic field sensitivities of −100 pm/mT and −488 pm/mT have been experimentally demonstrated with the PMF lengths of 75 cm and 20 cm respectively in the range of magnetic field strengths from 0 to 200 mT. The dependence of the magnetic field orientation on the performance of the proposed sensor was also examined. The proposed magnetic field sensor is advantageous for applications requiring higher sensitivity over a wide magnetic field range.
Original languageEnglish
Pages (from-to)4725
JournalScientific Reports
Volume7
Issue number1
Early online date5 Jul 2017
DOIs
Publication statusE-pub ahead of print - 5 Jul 2017

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