Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 38: Poster IV

Q 38.10: Poster

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

Microscopy Setup for Optical Measurements of Distances between Nanodiamonds and Microwave-Antennas — •Oliver Beiersdorf, Stefan Dix, Dennis Lönard, Isabel Barbosa, and Artur Widera — Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

Due to their properties, negatively charged nitrogen-vacancy (NV) centers in nanodiamonds are well-known in the field of magnetometry. In these quantum systems, spin transitions can be induced by resonant microwave pulses and measured by fluorescence after laser excitation.

In this work, a reflected light microscopy setup for nanodiamonds was built, including illumination and excitation of a sample positionable with an accuracy of about 100 nm, a camera setup, and a fluorescence detection unit. It further allows to freely position optical fibers over the sample with an accuracy of about 1 µm.

In this way, we want to quantify the dependence of the rabi-oscillations of NV centers on the distance of a fiber-based endoscope with a silver direct-laser-written structure for microwave emission next to a fiber facet that can be used for excitation. By successfully determining this dependence, we aim to validate the suitability of NV diamonds as quantum sensors not only for magnetometry but also for distance determination, ultimately enabling multifunctional NV-based sensors.

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