Abstract
Traditional optical fibers are insensitive to magnetic fields, however many applications would benefit from fiber-based magnetometry devices. In this work, we demonstrate a magnetically sensitive optical fiber by doping nanodiamonds containing nitrogen vacancy centers into tellurite glass fibers. The fabrication process provides a robust and isolated sensing platform as the magnetic sensors are fixed in the tellurite glass matrix. Using optically detected magnetic resonance from the doped nanodiamonds, we demonstrate detection of local magnetic fields via side excitation and longitudinal collection. This is a first step towards intrinsically magneto-sensitive fiber devices with future applications in medical magneto-endoscopy and remote mineral exploration sensing.
Highlights
The sensing of magnetic fields is important for applications as diverse as mining exploration[1] and aircraft navigation[2]
Using optically detected magnetic resonance from the NDs we demonstrate the intrinsic sensitivity of the doped tellurite fiber to external magnetic fields
In addition to the Zeeman splitting, we observe an overall reduction in the fluorescence intensity with increasing magnetic field which can be best seen away from the resonance peaks. To investigate this fluorescence intensity reduction, we theoretically modelled the impact of the external magnetic field on the fluorescence rate and optically detected magnetic resonance (ODMR) signal for varying magnetic field strengths, see Supplementary Material
Summary
The sensing of magnetic fields is important for applications as diverse as mining exploration[1] and aircraft navigation[2]. Solid state magnetometers based on the negatively-charged nitrogen-vacancy (NV) defect in diamond provide an additional avenue for sensitive magnetic field detection under ambient conditions[5,10]. The size of such systems can be of order nanometers opening up new opportunities for robust, miniature and remote magnetic sensors. Conventional detection approaches utilize high numerical aperture objectives to collect isotropic emission from diamond defect centers This approach yields a typical collection efficiency of emitted photons around 2%13 but is limited by the size of the objective and mechanical instabilities. Using optically detected magnetic resonance from the NDs we demonstrate the intrinsic sensitivity of the doped tellurite fiber to external magnetic fields
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