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Ultrasensitive magnetic field sensor based on an in-fiber Mach–zehnder interferometer with a magnetic fluid component

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Photonics Research 2016年第5期4卷 197-201页

作者： Zhengyong Li Changrui Liao Jun Song Ying Wang Feng Zhu Yiping Wang Xiaopeng Dong Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University School of Information Science and Engineering Xiamen University

An ultrasensitive magnetic field sensor based on a compact in-fiber Mach–zehnder interferometer(MZI) created in twin-core fiber(TCF) is proposed, and its performance is experimentally demonstrated. A section of TCF was spliced between two sections of standard single-mode fibers, and then a microchannel was drilled through one core of the TCF by means of femtosecond laser micromachining. The TCF with one microchannel was then immersed in a water-based Fe_3O_4 magnetic fluid(MF), forming a direct component of the light propagation path,and then sealed in a capillary tube, achieving a magnetic sensing element, which merges the advantages of an MZI with an MF. Experiments were conducted to investigate the magnetic response of the proposed sensor. The developed magnetic field sensor exhibits a linear response within a measurement range from 5 to 9.5 m T and an ultrahigh sensitivity of 20.8 nm/m T, which, to our best knowledge, is 2 orders of magnitude greater than other previously reported magnetic sensors. The proposed sensor is expected to offer significant potential for detecting weak magnetic fields.

关键词： TCF zehnder interferometer with a magnetic fluid component Ultrasensitive magnetic field sensor based on an in-fiber Mach MZI

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