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Updated: Aug 5, 2026

Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Vector magnetic field sensing using a tapered seven-core fiber modal interferometer
Abstract:
We propose and demonstrate a compact all-fiber vector magnetic field sensor based on a tapered seven-core fiber reflective modal interferometer. The sensor exploits the intrinsic spatial arrangement of the outer cores to detect directional microbending induced by an external magnetic field. A microsphere functionalized with a magneto-mechanically responsive Fe3O4 composite at the fiber tip translates the magnetic field vector into distinct directional spectral shifts. The fabricated device achieves a maximum sensitivity of 17.14 pm/mT with high linearity (R2>0.95) across a measurement range of 30 to 60 mT. This robust architecture and comprehensive vector sensing capability provide a highly promising solution for spatial magnetic mapping and advanced navigation systems.
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