Next Article in Journal
Routing in Mobile Wireless Sensor Networks: A Leader-Based Approach
Next Article in Special Issue
Vehicle Speed and Length Estimation Using Data from Two Anisotropic Magneto-Resistive (AMR) Sensors
Previous Article in Journal
USEQ: A Short Questionnaire for Satisfaction Evaluation of Virtual Rehabilitation Systems
Previous Article in Special Issue
Design and Parametric Study of the Magnetic Sensor for Position Detection in Linear Motor Based on Nonlinear Parametric model order reduction
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Sensors 2017, 17(7), 1590; doi:10.3390/s17071590

Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling

1
College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China
2
Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai 200093, China
*
Author to whom correspondence should be addressed.
Received: 22 May 2017 / Revised: 22 June 2017 / Accepted: 3 July 2017 / Published: 7 July 2017
(This article belongs to the Special Issue Magnetic Sensors and Their Applications)
View Full-Text   |   Download PDF [8686 KB, uploaded 7 July 2017]   |  

Abstract

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. View Full-Text
Keywords: magnetic field sensor; magnetic fluid; singlemode-no-core-singlemode fiber structures; refractive-index-matched coupling magnetic field sensor; magnetic fluid; singlemode-no-core-singlemode fiber structures; refractive-index-matched coupling
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Rao, J.; Pu, S.; Yao, T.; Su, D. Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling. Sensors 2017, 17, 1590.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top