Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 5: Magnetometry

Q 5.4: Talk

Monday, March 11, 2024, 12:00–12:15, HS 1221

Compact Fiberized NV based 3D Magnetic Field Sensor — •Jonas Homrighausen¹, Frederik Hoffmann², Jens Pogorzelski², Peter Glösekötter², and Markus Gregor¹ — ¹Department of Engineering Physics, University of Applied Sciences, Münster — ²Department of Electrical Engineering and Computer Science, University of Applied Sciences, Münster

In the field of quantum magnetometry, ensembles of NV centers in diamond offer high sensitivity, high bandwidth and outstanding spatial resolution while operating at room temperature. Furthermore, the orientation of the defect centers along four crystal axes form an inherent coordinate system that can be exploited to perform vector magnetometry in a single device. For recovering three-dimensional magnetic field information, an external known magnetic field is critical, typically provided by a 3D Helmholtz coil. This however leads to a bulky and lab-bound setup and inhibits any miniaturization of the sensor device. Here, we present a novel approach that facilitates the generation of a localized bias field at the fiber tip and consequently omits the use of external field generation like Helmholtz coils and rare earth magnets. Leveraging pre-selected orientations of diamond microcrystals, we demonstrate vector magnetometry with the uniaxial DC magnetic field. We achieve a sensitivity in the nT/Hz^1/2 range, microscale spatial resolution and a sensor cross section of <1mm².

Keywords: Quantum Sensing; NV Center; Fiber Sensor; Vector Magnetometry