Abstract
Nitrogen vacancy (NV) color centers in diamond are a leading modality for both superresolution optical imaging and nanoscale magnetic field sensing. In this work, we address the key challenge of performing optical magnetic imaging and spectroscopy selectively on multiple NV centers that are located within a diffraction-limited field-of-view. We use spin-RESOLFT microscopy to enable precision nanoscale mapping of magnetic field patterns with resolution down to ~20 nm, while employing a low power optical depletion beam. Moreover, we use a shallow NV to demonstrate the detection of proton nuclear magnetic resonance (NMR) signals exterior to the diamond, with 50 nm lateral imaging resolution and without degrading the proton NMR linewidth.
Highlights
Nitrogen vacancy (NV) color centers, atomic-scale quantum defects embedded in diamond [1], are the leading modality for nanoscale magnetic sensing, with wide-ranging applications in both the physical and life sciences
We address the key challenge of performing optical magnetic imaging and spectroscopy selectively on multiple NV centers that are located within a diffraction-limited field-of-view
We use a shallow NV to demonstrate the detection of proton nuclear magnetic resonance (NMR) signals exterior to the diamond, with 50 nm lateral imaging resolution and without degrading the proton NMR linewidth
Summary
Nitrogen vacancy (NV) color centers, atomic-scale quantum defects embedded in diamond [1], are the leading modality for nanoscale magnetic sensing, with wide-ranging applications in both the physical and life sciences. Many envisioned applications of NV centers at the nanoscale, such as determining atomic arrangements in single biomolecules [4] or realizing selective strong coupling between individual spins [10] as a pathway to scalable quantum simulations [11], would benefit from a combination of superresolution imaging with high sensitivity magnetometry. We use spin-RESOLFT to optically resolve individual NV centers in a bulk diamond sample (Appendix A) with a resolution of about 20 nm in the lateral (xy) directions, while exploiting the spin-state dependent optical properties (Fig. 1(a)) and long electronic spin coherence times of NV centers in bulk diamond for precision magnetic field sensing. Comparison confocal data in (d) and (e) are normalized to the maximum photon counts. spin-RESOLFT profiles and images are determined by comparing the fluorescence after applying the doughnut (pulse sig) with confocal scans (pulse ref0) and normalized with respect to the maximum spin contrast (see Appendix B)
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