NMR spectroscopy using quantum defects in diamond

NMR sensors based on nitrogen-vacancy (NV) centers can optically detect magnetic signals from sample volumes several orders of magnitude smaller than the most sensitive inductive detectors. Hence an NV-NMR spectrometer is a promising tool for next-generation analytic technologies, such as single-cell analysis and metabolomics. However, the performance of an ensemble NV-NMR spectrometer is limited by the magnetic field sensitivity of the device. We present a readout technique to perform high-resolution micron-scale NV-NMR spectroscopy with enhanced sensitivity. We also investigate the effect of the bias magnetic field and laser power on this measurement technique.