Highly sensitive magnetic field sensor based on microfiber coupler with magnetic fluid

A kind of magnetic field sensor using a microfiber coupler (MFC) surrounded with magnetic fluid (MF) is proposed and experimentally demonstrated. As the MFC is strongly sensitive to the surrounding refractive index (RI) and MF's RI is sensitive to magnetic field, the magnetic field sensing function of the proposed structure is realized. Interrogation of magnetic field strength is achieved by measuring the dip wavelength shift and transmission loss change of the transmission spectrum. The experimental results show that the sensitivity of the sensor is wavelength-dependent. The maximum sensitivity of 191.8 pm/Oe is achieved at wavelength of around 1537 nm in this work. In addition, a sensitivity of −0.037 dB/Oe is achieved by monitoring variation of the fringe visibility. These suggest the potential applications of the proposed structure in tunable all-in-fiber photonic devices such as magneto-optical modulator, filter, and sensing.

[1]  C. D. Hussey,et al.  Polarisation analysis of strongly fused and weakly fused tapered couplers , 1985 .

[2]  Xinwan Li,et al.  Tunable magneto-optical wavelength filter of long-period fiber grating with magnetic fluids , 2007 .

[3]  Yongmin Jung,et al.  Optical microfiber coupler for broadband single-mode operation. , 2009, Optics express.

[4]  Perry Ping Shum,et al.  Optical fiber magnetic field sensor based on magnetic fluid and microfiber mode interferometer , 2015 .

[5]  W. Ji,et al.  Ultrahigh Sensitivity Refractive Index Sensor Based on Optical Microfiber , 2012, IEEE Photonics Technology Letters.

[6]  Tiegen Liu,et al.  Optical fiber magnetic field sensor based on single-mode-multimode-single-mode structure and magnetic fluid. , 2013, Optics letters.

[7]  John Philip,et al.  The effect of suspended Fe3O4 nanoparticle size on magneto-optical properties of ferrofluids , 2015 .

[8]  Bai-Ou Guan,et al.  Ultrasensitive refractive-index sensors based on rectangular silica microfibers. , 2011, Optics letters.

[9]  Peng Zu,et al.  Enhancement of the sensitivity of magneto-optical fiber sensor by magnifying the birefringence of magnetic fluid film with Loyt-Sagnac interferometer , 2014 .

[10]  Shengli Pu,et al.  Magnetic field sensing based on magneto-volume variation of magnetic fluids investigated by air-gap Fabry-Pérot fiber interferometers , 2013 .

[11]  Stavros Pissadakis,et al.  A loss-based, magnetic field sensor implemented in a ferrofluid infiltrated microstructured polymer optical fiber , 2014 .

[12]  Peter Horak,et al.  Optical microfiber coil resonator refractometric sensor. , 2007, Optics express.

[13]  Hao Zhang,et al.  Low temperature sensitive intensity-interrogated magnetic field sensor based on modal interference in thin-core fiber and magnetic fluid , 2014 .

[14]  Shengli Pu,et al.  Magnetic field sensing based on magnetic-fluid-clad fiber-optic structure with taper-like and lateral-offset fusion splicing. , 2014, Optics express.

[15]  Pengfei Wang,et al.  A microfiber coupler tip thermometer. , 2012, Optics express.

[16]  Ning Wang,et al.  Magnetic field sensing based on singlemode-multimode-singlemode fiber structures using magnetic fluids as cladding. , 2013, Optics letters.

[17]  Shengli Pu,et al.  Tunable slow light based on magnetic-fluid-infiltrated photonic crystal waveguides , 2014 .

[18]  Liu Tiegen,et al.  All-fiber optical modulator based on no-core fiber and magnetic fluid as cladding* , 2015 .

[19]  Peng Zu,et al.  Temperature-Insensitive Magnetic Field Sensor Based on Nanoparticle Magnetic Fluid and Photonic Crystal Fiber , 2012, IEEE Photonics Journal.

[20]  Yong-xing Jin,et al.  Magneto-optical fiber sensor based on bandgap effect of photonic crystal fiber infiltrated with magnetic fluid , 2012 .

[21]  Minghong Yang,et al.  Magnetic field sensor based on magnetic fluid clad etched fiber Bragg grating , 2011 .

[22]  Lin Bo,et al.  High Sensitivity Fiber Refractometer Based on an Optical Microfiber Coupler , 2013, IEEE Photonics Technology Letters.

[23]  Decai Li,et al.  Compact magnetic-field sensor based on optical microfiber Michelson interferometer and Fe3O4 nanofluid. , 2013, Applied optics.

[24]  Hamid Latifi,et al.  Magnetic Field Sensor Based on Nonadiabatic Tapered Optical Fiber With Magnetic Fluid , 2014, IEEE Photonics Technology Letters.

[25]  B. B. Lahiri,et al.  Temperature dependent light transmission in ferrofluids , 2015 .

[26]  C. D. Hussey,et al.  Modelling fused single-mode-fibre couplers , 1985 .

[27]  Hao Zhang,et al.  Magnetic field tunability of optical microfiber taper integrated with ferrofluid. , 2013, Optics express.

[28]  Yan-qing Lu,et al.  A miniature reflective micro-force sensor based on a microfiber coupler. , 2014, Optics express.

[29]  Jianhui Yu,et al.  Optically tunable microfiber-knot resonator. , 2011, Optics express.

[30]  Zhilin Xu,et al.  Simultaneous measurement of refractive index and temperature using multimode microfiber-based dual Mach-Zehnder interferometer. , 2014, Optics letters.

[31]  Makoto Katayama,et al.  Fiber-optic coupler based refractive index sensor and its application to biosensing , 2007 .