AUTHOR=Chatzidrosos Georgios , Rebeirro Joseph Shaji , Zheng Huijie , Omar Muhib , Brenneis Andreas , Stürner Felix M. , Fuchs Tino , Buck Thomas , Rölver Robert , Schneemann Tim , Blümler Peter , Budker Dmitry , Wickenbrock Arne 

TITLE=Fiberized Diamond-Based Vector Magnetometers

JOURNAL=Frontiers in Photonics

VOLUME=2

YEAR=2021

URL=https://www.frontiersin.org/journals/photonics/articles/10.3389/fphot.2021.732748

DOI=10.3389/fphot.2021.732748

ISSN=2673-6853

ABSTRACT=<p>We present two fiberized vector magnetic-field sensors, based on nitrogen-vacancy (NV) centers in diamond. The sensors feature sub-nT/<inline-formula id="inf1"><mml:math id="m1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:mi mathvariant="normal">z</mml:mi></mml:mrow></mml:msqrt></mml:math></inline-formula> 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.</p>