Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling
An ultrasensitive magnetic field sensor is proposed and investigated experimentally. The no-core fiber is fusion-spliced between two pieces of single-mode fibers and then immersed in magnetic fluid with an appropriate value of refractive index. Under the refractive-index-matched coupling condition,...
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doaj-5e33b7434b0f4b5bb90c7160375fdc0c2020-11-25T00:17:05ZengMDPI AGSensors1424-82202017-07-01177159010.3390/s17071590s17071590Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched CouplingJie Rao0Shengli Pu1Tianjun Yao2Delong Su3College of Science, University of Shanghai for Science and Technology, Shanghai 200093, ChinaCollege of Science, University of Shanghai for Science and Technology, Shanghai 200093, ChinaCollege of Science, University of Shanghai for Science and Technology, Shanghai 200093, ChinaCollege of Science, University of Shanghai for Science and Technology, Shanghai 200093, ChinaAn ultrasensitive magnetic field sensor is proposed and investigated experimentally. The no-core fiber is fusion-spliced between two pieces of single-mode fibers and then immersed in magnetic fluid with an appropriate value of refractive index. Under the refractive-index-matched coupling condition, the guided mode becomes leaky and a coupling wavelength dip in the transmission spectrum of the structure is observed. The coupling wavelength dip is extremely sensitive to the ambient environment. The excellent sensitivity to the refractive index is measured to be 116.681 μm/RIU (refractive index unit) in the refractive index range of 1.45691–1.45926. For the as-fabricated sensors, the highest magnetic field sensing sensitivities of 6.33 and 1.83 nm/mT are achieved at low and high fields, respectively. The sensitivity is considerably enhanced compared with those of previously designed, similar structures.https://www.mdpi.com/1424-8220/17/7/1590magnetic field sensormagnetic fluidsinglemode-no-core-singlemode fiber structuresrefractive-index-matched coupling |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jie Rao Shengli Pu Tianjun Yao Delong Su |
spellingShingle |
Jie Rao Shengli Pu Tianjun Yao Delong Su Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling Sensors magnetic field sensor magnetic fluid singlemode-no-core-singlemode fiber structures refractive-index-matched coupling |
author_facet |
Jie Rao Shengli Pu Tianjun Yao Delong Su |
author_sort |
Jie Rao |
title |
Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling |
title_short |
Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling |
title_full |
Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling |
title_fullStr |
Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling |
title_full_unstemmed |
Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling |
title_sort |
ultrasensitive magnetic field sensing based on refractive-index-matched coupling |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2017-07-01 |
description |
An ultrasensitive magnetic field sensor is proposed and investigated experimentally. The no-core fiber is fusion-spliced between two pieces of single-mode fibers and then immersed in magnetic fluid with an appropriate value of refractive index. Under the refractive-index-matched coupling condition, the guided mode becomes leaky and a coupling wavelength dip in the transmission spectrum of the structure is observed. The coupling wavelength dip is extremely sensitive to the ambient environment. The excellent sensitivity to the refractive index is measured to be 116.681 μm/RIU (refractive index unit) in the refractive index range of 1.45691–1.45926. For the as-fabricated sensors, the highest magnetic field sensing sensitivities of 6.33 and 1.83 nm/mT are achieved at low and high fields, respectively. The sensitivity is considerably enhanced compared with those of previously designed, similar structures. |
topic |
magnetic field sensor magnetic fluid singlemode-no-core-singlemode fiber structures refractive-index-matched coupling |
url |
https://www.mdpi.com/1424-8220/17/7/1590 |
work_keys_str_mv |
AT jierao ultrasensitivemagneticfieldsensingbasedonrefractiveindexmatchedcoupling AT shenglipu ultrasensitivemagneticfieldsensingbasedonrefractiveindexmatchedcoupling AT tianjunyao ultrasensitivemagneticfieldsensingbasedonrefractiveindexmatchedcoupling AT delongsu ultrasensitivemagneticfieldsensingbasedonrefractiveindexmatchedcoupling |
_version_ |
1725381091032825856 |