Optically detected magnetic resonance with negatively-charged nitrogen vacancy centres in diamond
This thesis investigates the properties of negatively charged nitrogen-vacancy (NV–) centres in diamond where we developed experimental capability to explore the optically detected magnetic resonance (ODMR) physics of NV– centres. In addition, the energy separations between the ms = |0〉 and ms = |–1〉 sublevels of the NV– centre ground state are calculated to aid an understanding of the underlying interactions between the NV– centre and magnetic fields. Measurements were performed pertaining to the characterisation of a diamond sample, utilising multiple experimental methods such as spectroscopy and optically detected magnetic resonance (ODMR) with magnetic fields and microwaves (MWs). This enables a reliable determination of the various crystal faces (and hence the Miller indices) of the diamond sample which is compared with theoretical models. A custom-built MW cavity is characterised for a range of magnetic fields and MWs. This cavity enables an exploration of how the spin properties of the NV– centre vary through the use of different techniques for delivering MWs to the diamond sample. These experimental capabilities allow for a greater understanding of the physics of the NV– centre. As a result, the physical properties of our diamond sample provides a platform for further investigating its use in applications such as masers.