Laser-sculpted hybrid photonic magnetometer with nanoscale magnetostrictive interaction

Thomas Allsop, Graham B. Lee, Changle Wang, Ronald Neal, Kyriacos Kalli, Philip Culverhouse, David J. Webb

Research output: Contribution to journalArticle

Abstract

We present a new photonic magnetic sensor that can yield information on the spatial angle of rotation of the sensor within a given static magnetic field that based upon an optical fiber platform that has a wavelength-encoded output and a demonstrated sensitivity of 543 pm/mT. This optical fiber magnetic field sensor combines a conventional, UV-laser inscribed long period grating (LPG) with a magnetostrictive material Terfenol-D that coats and fills 50-μm micro-slots running adjacent and parallel to the fiber central axis. The micro-slots are produced using a femtosecond laser and selective chemical etching. A detection limit for a static magnetic field strength of ±50μT is realized in low strength DC magnetic field (below 0.4 mT), this performance approaches the Earth’s magnetic field strength and thus, once optimized, has potential for navigation applications. Our method addresses the major drawback of conventional sensors, namely their inadequate sensitivity to low strength, static magnetic fields and their inability to provide information about the orientation and magnitude.
Original languageEnglish
JournalSensors and Actuators A : physical
Volume269
Early online date12 Dec 2017
DOIs
Publication statusPublished - 12 Dec 2017

Bibliographical note

Crown Copyright © 2017 Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Funding: EPSRC grants EP/J010413 and EP/J010391.

Keywords

  • Magnetostrictive material
  • Long period gratings
  • Optical sensing
  • Magnetic sensors

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