Abstract
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 language | English (US) |
|---|---|
| Pages (from-to) | 227-229 |
| Number of pages | 3 |
| Journal | Nonlinear Optics Quantum Optics |
| Volume | 50 |
| State | Published - 2019 |
Keywords
- 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
- General Computer Science
- Atomic and Molecular Physics, and Optics
- Instrumentation