Optical dynamic nuclear polarization of C spins in diamond at a low field with multi-tone microwave irradiation
arXiv:2110.14850 · doi:10.3390/molecules27051700
Abstract
Most of dynamic nuclear polarization (DNP) has been requiring helium cryogenics and strong magnetic fields for a high degree of polarization. In this work, we instead demonstrate an optical hyperpolarization of naturally abundant C nuclei in a diamond crystal at a low magnetic field and an ambient temperature. It exploits continuous irradiations of pump laser for polarizing electron spins of nitrogen vacancy centers and microwave for transferring the induced polarization to C nuclear spins. Triplet structures corresponding to N hyperfine splitting were clearly observed in the spectrum of C polarization. The powers of microwave irradiation and pump laser were optimized. By simultaneously irradiating three microwave frequencies matching to the peaks of the triplet, we achieved a C bulk polarization of 0.113 %, leading to an enhancement of about a factor of 90,000 over the thermal polarization at 17.6 mT. We believe that the multi-tone irradiation can be universally adopted to further enhance the C polarization at a low magnetic field.
7 pages, 7 figures