Macquarie University
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Coupling Nitrogen-Vacancy Centres in Diamond to a Grape Dimer Cavity

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posted on 2023-04-19, 23:46 authored by Ali Fawaz

Efficient coupling between microwave fields and solid-state spins is essential in many quantum technology applications, such as spin-based magnetic field sensors or (room-temperature) masing devices. This thesis investigates the coupling of an ensemble of Nitrogen-Vacancy (NV) centre spins in nanodiamonds to a novel type of microwave resonator, consisting of dielectric spherical or ellipsoidal dimers, which exhibit high-intensity magnetic field hotspots due to morphological-dependent resonances. Specifically, the thesis explores the use of grapes as building blocks for those resonators. Numerical modelling was performed to demonstrate the formation of magnetic field hotspots in grape dimers. In parallel, nanodiamonds with NV spin ensembles were placed between actual grape dimers and optically detected magnetic resonance (ODMR) measurements were carried out for characterisation. In the presence of grape dimers, the magnetic field was estimated to be more than double compared to measurements without grape dimers. The demonstration of NV spins interacting with the magnetic field in the hotspot between grape dimers serves as an initial step in constructing precise and more efficient cavity resonators based on a spherical or ellipsoidal dielectric design. Such cavities may lead to a low-cost and more effective alternative to existing techniques. 


Table of Contents

1. Introduction -- 2. Nitrogen-Vacancy Spins, Microwave Cavities and Grapes -- 3. Modelling of Resonances in Grape Dimers and ODMR with NV Spins -- 4. Experimentally Coupling Microwave Fields to NV Spins with Grape Dimers -- 5. Conclusions and Outlooks -- Appendix: FEM Results -- List of Symbols -- References

Awarding Institution

Macquarie University

Degree Type

Thesis MRes

Department, Centre or School

School of Mathematical and Physical Sciences

Year of Award


Principal Supervisor

Thomas Volz

Additional Supervisor 1

Sarath Raman Nair

Additional Supervisor 2

Gavin Brennen


Copyright: The Author Copyright disclaimer:




75 pages

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