30 - Fitting nitrogen vacancy magnetometry spectra

Abstract

Quantum sensors are useful in a variety of applications, ranging from accelerator science to biomedical imaging. Nitrogen vacancy (NV) centers in diamond can be used to perform sensitive measurements of magnetic fields and make excellent sensors due to the compatibility of the diamond crystals with different environments. We use laser light to excite photoluminescence from NV centers and observe the dependence on external magnetic fields via optically detected magnetic resonance (ODMR). The ODMR spectrum presents as a complex series of multiple resonance peaks whose positions and intensities depend on the interaction of the NV centers with the external magnetic field, in particular its direction and magnitude. We developed a computer code to fit the position of the resonance peaks so that we can extract the value of the magnetic field. Each peak is individually fitted, obtaining the parameters allowing us to then manually fit the entire spectrum of peaks. Currently, we are working towards a fitting algorithm that will handle an arbitrary number of peaks simultaneously, allowing us to automatically fit the entire ODMR signal and extract the magnetic field