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The use of nitrogen-vacancy centers in diamond as a non-invasive platform forhyperpolarizing nuclear spins in molecular samples is a promising area ofresearch with the potential to enhance the sensitivity of nuclear magneticresonance experiments. Transferring NV polarization out of the diamondstructure has been achieved on nanoscale targets using dynamical nuclearpolarization methods, but extending this to relevant NMR volumes posessignificant challenges. One major technical hurdle is the presence ofparamagnetic defects in the diamond surface which can interfere withpolarization outflow. However, these defects can also be harnessed asintermediaries for the interaction between NVs and nuclear spins. We present amethod that benefits from existing microwave sequences, namely the PulsePol, totransfer polarization efficiently and robustly using dangling bonds or otherlocalized electronic spins, with the potential to increase polarization ratesunder realistic conditions.

Enhancing polarization transfer from nitrogen-vacancy centers in diamond to external nuclear spins via dangling bond mediators