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

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

doi:10.1038/s41598-017-05199-y

Cited by 64 publications

(39 citation statements)

References 19 publications

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“…Extrinsic fiber-based Fabry-Pérot interferometers have also been constructed by axially aligning two optical fibers and leaving a gap between them, which is filled with a magnetic fluid [9]. Sagnac interferometers have also been used to detect either the magnetic field strength or orientation due to the birefringence and dichroism properties [10,11]. In [12], the spectral properties of a uniform and of a chirped Bragg grating were actively changed by controlling the position of a magnetic fluid that surrounds the grating.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field sensors in fused silica fabricated by femtosecond laser micromachining

et al. 2020

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Based on the characteristics of ferrofluids, a monolithic optofluidic device for magnetic field sensing is proposed and demonstrated. The device consists of a Fabry-Pérot interferometer, composed by an optical waveguide orthogonal to a microfluidic channel, which was fabricated inside a fused silica substrate through femtosecond laser micromachining. The interferometer was first optimized by studying the influence of the waveguide writing parameters on its spectral properties. Waveguides written at higher pulse energies led to a decrease of the signal-to-noise ratio, due to an enhancement of micrometer sized defects associated with Mie scattering. Fringe visibility was also maximized for waveguides written at lower scanning speeds. Making use of the tunable refractive index property exhibited by magnetic fluids, the interferometer was then tested as a magnetic field sensor by injecting a ferrofluid inside the microfluidic channel. A linear sensitivity of −0.25 nm/mT was obtained in the 9.0-30.5 mT range with the external field parallel to the waveguide axis.

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Section: Introductionmentioning

confidence: 99%

Magnetic field sensors in fused silica fabricated by femtosecond laser micromachining

et al. 2020

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“…In recent years, owing to the advantages of easy integration with existing optical systems and the high sensitivity to external environmental changes, optical microfiber couplers (OMCs) have been widely used in sensing fields and other functional devices (especially by the fusing and tapering of two conventional fibers) [1][2][3][4][5][6][7][8]. Moreover, the OMC is a wavelength-dependent device that can be used as a mode-selection filter for fiber lasers [5].…”

Section: Introductionmentioning

confidence: 99%

Characteristic Test Analysis of Graphene Plus Optical Microfiber Coupler Combined Device and Its Application in Fiber Lasers

Chen

Zhang

et al. 2020

Sensors

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In this study, a graphene and optical microfiber coupler (OMC) integrated device (GOMC) was proposed and fabricated. After its characteristic analysis and testing, it was applied to the development of adjustable multi-wavelength fiber lasers. By integrating the OMC with graphene, the polarization dependence of OMC was enhanced. Meanwhile, the novel GOMC was given the capabilities of filtering, coupling, beam splitting, and polarization correlation. When the GOMC was integrated as a filter and beam splitter into the ring cavity of the fiber laser, the proposed GOMC-based fiber laser could achieve single-wavelength and multi-wavelength regulated output. The laser had a 3 dB linewidth of less than 30 pm, a signal-to-noise ratio of approximately 40 dB, and an output power fluctuation of less than 1 dB. The GOMC could also be used for the development of functional devices, such as adjustable mode lockers and mode coupling selectors, which provide an excellent experimental platform for new fiber lasers and the research of multi-dimensional light-field manipulation.

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“…Many techniques to enhance the performance of MZI-based sensors have been proposed, including a micro-cavity inside the fiber [ 9 , 10 , 11 ], large lateral offset splicing [ 12 ], and a special fiber [ 13 ]. Recently, optical microfibers with a strong evanescent field have been proposed and applied to various physical sensors such as current sensing probes [ 14 ], compact refractometers [ 15 ], bidirectional bending sensors [ 16 ], coil resonators [ 17 ], and magnetic field sensors incorporating a fiber loop mirror [ 18 ]. Compared with conventional MZI-based sensing probes, inserting an optical microfiber into the MZI can make the microfiber MZI sensitive to external perturbations [ 19 , 20 , 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Temperature Sensitivity of a Polymer-Overlaid Microfiber Mach-Zehnder Interferometer

Han

2017

Sensors

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Abstract:The temperature sensitivity of the free spectral range (FSR) for a polymer-overlaid microfiber Mach-Zehnder interferometer (MZI) is investigated both theoretically and experimentally. The waist diameter of the optical microfiber can be controlled to alter the thermal expansion and optic properties of the polymer-coated MZI. Inserting an optical microfiber with a strong evanescent field into the MZI, a low index polymer with high thermal characteristics is deposited on the surface of the microfibers to realize a polymer-overlaid microfiber MZI. It was found that the thermal expansion factor in the proposed MZI plays an important role in the temperature sensitivity of the FSR. The temperature sensitivity of the polymer-overlaid microfiber MZI is improved, which is measured to be −8.29 nm/ • C at 25 • C. The optical transmission spectrum of the polymer-overlaid microfiber MZI is converted to the spatial frequency spectrum via fast Fourier transform. The temperature sensitivity of the spatial frequency in the proposed polymer-overlaid MZI is estimated to be 18.31 pm −1 • C −1 , which is 17 times higher than that of the microfiber MZI without polymer coating (1.04 pm −1 • C −1 ).

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

Cited by 64 publications

References 19 publications

Magnetic field sensors in fused silica fabricated by femtosecond laser micromachining

Magnetic field sensors in fused silica fabricated by femtosecond laser micromachining

Characteristic Test Analysis of Graphene Plus Optical Microfiber Coupler Combined Device and Its Application in Fiber Lasers

Investigation of Temperature Sensitivity of a Polymer-Overlaid Microfiber Mach-Zehnder Interferometer

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