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Q: Fachverband Quantenoptik und Photonik
Q 48: Poster – Quantum Optics, Technologies, and Optomechanics
Q 48.11: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Increasing the Efficiency of Microwave Coupling to NV Centers from Microstrip Transmission Lines — •Dennis Stiegekötter1, Jens Pogorzelski1, Ludwig Horsthemke1, Frederik Hoffmann1, Ann-Sophie Bülter1, Markus Gregor2, and Peter Glösekötter1 — 1FH Münster, Department of Electrical Engineering and Computer Science, Steinfurt, Germany — 2FH Münster, Department of Engineering Physics, Steinfurt, Germany
Quantum technologies often rely on microwaves to excite electron spin state transitions. In the application of, e.g., magnetic field sensors or mobile experiment kits [1], a high MW intensity is needed and results in bulky signal sources. The required power of the source can be reduced by an optimal coupling and high return loss of the transmission line to the MW antenna close to the diamond sample. This study focuses on an efficient change of the electron spin state in nitrogen-vacancy (NV) centers in diamond using microstrip line structures. To enhance the effectiveness of this excitation, we aim to increase MW field intensity by optimizing the substrate thickness and adjusting the current density within the microstrip line. The challenge with the identified microstrip line is its deviation from the 50 Ω waveguide impedance, leading to microwave reflections. To circumvent this issue, a three-stage quarter-wave transformer is utilized, ensuring broadband matching to a 50 Ω network and minimizing reflection losses. [1] Stegemann, J.*et al.*Modular low-cost 3D printed setup for experiments with NV centers in diamond.*European Journal of Physics*44, 035402 (2023).
Keywords: NV Center; Microstrip Line; Microwave; Quarter-Wave Transformer