Abstract
We present two fiberized vector magnetic-field sensors, based on nitrogen-vacancy (NV) centers in diamond. The sensors feature sub-nT/Hz magnetic sensitivity. We use commercially available components to construct sensors with a small sensor size, high photon collection, and minimal sensor-sample distance. Both sensors are located at the end of optical fibres with the sensor-head freely accessible and robust under movement. These features make them ideal for mapping magnetic fields with high sensitivity and spatial resolution (≤ mm). As a demonstration we use one of the sensors to map the vector magnetic field inside the bore of a ≥100 mT Halbach array. The vector field sensing protocol translates microwave spectroscopy data addressing all diamonds axes and including double quantum transitions to a 3D magnetic field vector.
Highlights
Nitrogen-vacancy (NV) centers in diamond have attracted attention as magnetic field sensors with high spatial resolution (Balasubramanian et al, 2008; Maze et al, 2008; Rittweger et al, 2009) and sensitivity (Barry et al, 2016; Chatzidrosos et al, 2017; Zhang et al, 2021)
The diamond sample used for the Mainz sensor is a 2.0 × 2.0 × 0.5 mm3 type Ib (100)-cut, high-pressure high-temperature (HPHT) grown sample, purchased from Element Six
The experimental procedure to characterize this magnet involves reconstruction of the 3D magnetic field from these optically detected magnetic resonance (ODMR) measurements, which we describe in the part of this paper
Summary
Nitrogen-vacancy (NV) centers in diamond have attracted attention as magnetic field sensors with high spatial resolution (Balasubramanian et al, 2008; Maze et al, 2008; Rittweger et al, 2009) and sensitivity (Barry et al, 2016; Chatzidrosos et al, 2017; Zhang et al, 2021). They allow for a small sensor size (11 × 40 mm for Mainz and 15 × 25 mm for Bosch) with maximized PL-to-pump-light ratio, as well as robustness to movement, which makes the sensors portable All of this makes the sensors ideal for mapping magnetic fields and measuring in regions that are not accessible. Details about the construction of the highly homogeneous Halbach array is subject of another publication (Wickenbrock et al, 2020)
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