Optimization of NV-Diamond Material Properties for High Sensitivity Magnetometry

POSTER

Abstract

Enhancing the sensitivity of ensemble-based magnetometry using NV-diamond requires optimized diamond samples with a high density of negatively-charged NV centers, good fluorescence contrast, and long spin coherence times. Here we report a systematic study of both the conversion efficiency from nitrogen to NV- and the negative-to-neutral NV charge state ratio versus initial nitrogen concentration, irradiation dose, and optical excitation intensity. We present a theoretical model that describes the measured NV charge state dynamics in the presence of both green laser excitation and substitutional nitrogen defects. We correlate a range of characterization measurements, and we draw conclusions on the optimal samples for NV magnetometry, with applications to magnetic surveying, geophysics, and neuroscience.

Authors

  • Jennifer Schloss

    • MIT/Harvard

  • Diana Prado Lopes Aude Craik

    • Harvard
    • Harvard University

  • Andrew Greenspon

    • Harvard

  • Xingyu Zhang

    • Harvard

  • Erik Bauch

    • Harvard

  • Connor Hart

    • Harvard
    • Department of Physics, Harvard University

  • Matthew Turner

    • Harvard
    • Department of Physics, Harvard University

  • Patrick Scheidegger

    • Harvard/ETH Zurich
    • Department of Physics, ETH Zurich. Department of Physics, Harvard University.
    • Department of Physics, ETH Zurich. Department of Physics, Harvard University

  • Evelyn Hu

    • Harvard

  • Ronald Walsworth

    • Harvard
    • Harvard-Smithsonian Center for Astrophysics. Department of Physics, Harvard University
    • Harvard University
    • Harvard-Smithsonian Center for Astrophysics and Department of Physics, Harvard University
    • Harvard-Smithsonian