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Q: Fachverband Quantenoptik und Photonik

Q 66: Poster – Quantum Technologies III

Q 66.8: Poster

Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG

Adaption and Evaluation of Custom Microwave Antennas for NV Center Coherence Measurements — •Yannick Resch, Anish Thomas, Stefan Johansson, Dennis Lönard, Alena Erlenbach, Jonas Gutsche, and Artur Widera — Department of Physics and State Research Center OPTIMAS, RPTU University Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

Due to their biocompatibility, nitrogen-vacancy (NV) centers in diamonds can be implanted into cells and algae to investigate magnetic-field signals and temperatures inside these biological samples. The sensitivity of the magnetic field and temperature sensing with NV centers is, however, often limited by the inhomogeneity of the microwave field used to drive the NV centers' spin states.

In this work, we report on the adaptation and evaluation of different designs of microwave patch antennas tailored for integration into an existing setup for probing biological samples. We investigate a double split-ring resonator and a planar ring design for their ability to generate homogeneous microwave fields and their efficiency in exciting the spin-resonance transitions of NV centers.

To achieve suitable impedance characteristics and field distribution, we used high-frequency simulations and characterized the resulting prototypes by experimental S-parameter analysis as well as magnitude and homogeneity of the microwave field, which was determined by measuring Rabi oscillations in several NV-diamond specimens.

Keywords: NV center; antenna design; magnetometry; impedance matching