A magnetic field fiber optic sensor with magneto-optic polymers and nanoparticle core-shell polymers

N. Peyghambarian, B. Amirsolaimani, P. Gangopadhyay, S. Showghi, L. Lacomb, J. Pyun, A. Persoons, R. A. Norwood

Research output: Contribution to journalArticlepeer-review


Miniaturized magnetic field sensors have become increasingly important in various applications, such as geophysical exploration for minerals and oil, volcanology, earthquake studies, and bio-medical imaging. Existing magnetometers lack either the required spatial or the temporal resolution or are restricted to costly shielded labs and cannot operate in an unshielded environment. Increasing the spatio-temporal resolution would allow for real-time measurements of magnetic fluctuations with high resolution. Here we report on a new nanocomposite-based system for miniaturized magnetic field sensing. The sensor is based on Dy 3+ -doped magnetite and cobalt ferrite nano-particles dispersed in a polymer matrix. Operation has been demonstrated at room temperature and in an unshielded environment. A compact fiber-optic interferometer is used as the detection mechanism with 20 fT/Hz sensitivity. We investigated the magnetic field response of the sensor and demonstrated the measurement of the human heartbeat as a potential application.

Original languageEnglish (US)
Pages (from-to)227-229
Number of pages3
JournalNonlinear Optics Quantum Optics
StatePublished - 2019


  • Fiber optic interferometer
  • Magnetic field sensor
  • Magneto-optic polymer
  • Nanocore shell polymer
  • Polarization rotation

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Instrumentation


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