Magnetic Field Sensing Technologies in Fiber Optics
Summary
Magnetic field sensing in optical fibres harnesses the interaction between guided light and magnetic materials or effects, offering high sensitivity, compactness and immunity to electromagnetic interference. Key principles include the Faraday effect in optically active fibres, magneto‐optical modulation via magnetic fluids or magnetostrictive coatings, and plasmonic enhancement through nanoscale metal films. Typical architectures comprise fibre Bragg gratings, interferometric schemes and microstructured or photonic crystal fibres. Surface plasmon resonance on coated fibres and cladding‐mode interference in tapered sections further boost sensitivity. Advances in vector sensing, dual‐parameter measurement and on‐chip integration have extended applications from navigation and power‐grid monitoring to biomedical diagnostics and space exploration. Efforts continue to optimise response range, temperature compensation and fabrication simplicity to meet the demands of diverse real-world environments.
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Magnetic Field Sensing Technologies in Fiber Optics publication trend
The graph below shows the total number of articles in magnetic field sensing technologies in fiber optics across all publications each year (not limited to Nature Index journals).
Technical terms
Fiber Bragg grating: A periodic modulation of refractive index inscribed in the core of an optical fibre that reflects specific wavelengths and transmits others, used for sensing strain, temperature and magnetic-field-induced refractive-index changes.
Magneto-optical effect: Interaction in which magnetic fields alter the propagation of light in certain materials, most notably the Faraday effect, enabling field detection via polarisation or phase shifts.
Surface plasmon resonance (SPR): Resonant oscillation of conduction electrons at a metal–dielectric interface excited by incident light, highly sensitive to refractive-index changes in adjacent media, used to amplify magnetic-fluid responses.
Cladding mode: A guided mode propagating in the fibre cladding rather than the core, whose evanescent field interacts strongly with external materials for enhanced sensing.
Photonic crystal fibre (PCF): A fibre with a microstructured arrangement of air holes running along its length, allowing tailored dispersion and enhanced light–matter interaction for multifunctional sensing.
Fabry–Perot cavity: An optical resonator formed by two parallel reflective surfaces that create interference fringes; when filled with magnetic fluid or doped fibre, fringe shifts indicate field variation.
Faraday rotation: Polarisation rotation of light as it travels through a magneto-optically active medium, proportional to the magnetic field component along the propagation direction.
References
- Numerical analysis of a metal-insulator-metal waveguide-integrated magnetic field sensor operating at sub-wavelength scales. Sensing and Bio-Sensing Research (2024).
- Vector magnetic field sensor based on U-bent single-mode fiber and magnetic fluid.. Optics Express (2021).
- Magnetic field and temperature dual-parameter sensor based on magnetic fluid materials filled photonic crystal fiber.. Optics Express (2020).
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