Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.14: Poster

Mittwoch, 13. März 2024, 17:00–19:00, KG I Foyer

A miniaturized and integrated fiber-based magnetic field sensor — •Stefan Dix, Dennis Lönard, Isabel Cardoso Barbosa, Jonas Gutsche, and Artur Widera — Physics Department and State Research Center OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

The nitrogen-vacancy (NV) center is a crucial element in measuring precise magnetic fields while also retrieving temperature information. Possible applications for this sensor range from medical surgery over the analysis of magnetic samples to current monitoring of today’s electric vehicles. While other concepts for integrated sensors have been shown, ongoing miniaturization requires ever smaller yet more robust sensing devices. In this work, we developed a versatile and robust sensor platform for macroscopic handling while maintaining a compact size and including wires and optical fibers on a platform diameter of 1.25 mm. Furthermore, we use direct laser writing to fixate and couple a 15 µm-sized diamond containing NV centers to one optical fiber and create a waveguide structure between another optical fiber to excite the NV center. Thus, we separate beam paths for excitation and detection to enhance the sensitivity. Necessary antenna structures are created on the tip of an optical fiber using a silver direct laser writing process. We test our device by probing the field distribution of a magnetic-coil system with high spatial and magnetic field resolution. Our results point towards a sub-millimeter, integrated sensor for high spatial resolution vector magnetometry with a large bandwidth.

Keywords: NV center; nitrogen-vacancy center; diamond; sensor; magnetic field