Related Experiment Video
Updated: Feb 27, 2026
07:28
Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
Published on: August 30, 2012
11.2K
Ultrasensitive Magnetic Field Sensing Based on Refractive-Index-Matched Coupling
Jie Rao1, Shengli Pu2,3, Tianjun Yao4
1College of Science, University of Shanghai for Science and Technology, Shanghai 200093, China. 152251908@st.usst.edu.cn.
Sensors (Basel, Switzerland)
|July 8, 2017
Summary
This study introduces an ultrasensitive magnetic field sensor using no-core fiber and magnetic fluid. It achieves high sensitivity for magnetic field detection, outperforming similar structures.
Area of Science:
- Photonics
- Fiber Optics
- Magnetic Field Sensing
Background:
- Fiber optic sensors offer advantages in harsh environments.
- Magnetic fluid-based sensors can enhance sensitivity.
- No-core fiber structures enable novel sensing mechanisms.
Purpose of the Study:
- To propose and experimentally investigate an ultrasensitive magnetic field sensor.
- To explore the sensing capabilities of a no-core fiber structure immersed in magnetic fluid.
- To achieve enhanced magnetic field sensitivity.
Main Methods:
- Fusion splicing a no-core fiber between single-mode fibers.
- Immersing the structure in magnetic fluid with controlled refractive index.
- Utilizing refractive-index-matched coupling to induce a leaky mode and wavelength dip.
- Analyzing the transmission spectrum for sensitivity measurements.
Main Results:
- Observed a coupling wavelength dip sensitive to the ambient environment.
- Measured excellent refractive index sensitivity of 116.681 μm/RIU.
- Achieved highest magnetic field sensing sensitivities of 6.33 nm/mT (low field) and 1.83 nm/mT (high field).
Conclusions:
- The proposed no-core fiber magnetic field sensor demonstrates ultrasensitive performance.
- The refractive-index-matched coupling is crucial for high sensitivity.
- The sensor shows significantly enhanced sensitivity compared to similar structures.
Related Concept Videos
01:31Ferromagnetism
3.2K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.2K
01:28Magnetic Field Due To A Thin Straight Wire
6.3K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
6.3K
01:28Magnetostatic Boundary Conditions
1.7K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.7K