SAMOP 2021 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Technology
Q 12.5: Poster
Wednesday, September 22, 2021, 16:30–18:30, P
A fiber-based endoscope with integrated microwave antenna for magnetic sensing — •Stefan Dix1, Jonas Gutsche1, Erik Waller2, Georg von Freymann1,2, and Artur Widera1 — 1Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany — 2Fraunhofer Institute for Industrial Mathematics ITWM, 67663 Kaiserslautern, Germany
Fiber-based endoscopes are established and widely applied as local fluorescence detectors for various samples, replacing bulky microscopes. Recently, fiber-based sensors with integrated diamonds containing nitrogen-vacancy (NV) centers have been developed. For magnetic field sensing using NV centers, a microwave field addresses a transition in the NV center. The microwave fields needed close to the fiber tip are usually created using thin wires.
Here, we present an integrated fiber-based sensor with a direct-laser-written (DLW) silver antenna structure on a multimode-fiber facet with a 50 µm core diameter and the implementation of a static magnetic field with an optional ring magnet around the fiber for the measurement of low magnetic fields. We present the characteristics of the applied microwave field, which we measure via network analysis as well as Rabi spectroscopy of diamonds with a diameter of ∼15 µm containing ∼3.5 ppm NV centers. We find a sensitivity of a few 100 nT/Hz1/2 of our sensor. Our endoscope thus points toward possible applications for remote measurements of vector-magnetic fields.