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Area of Science:

  • Quantum sensing
  • Nanoscale spectroscopy
  • Diamond nitrogen-vacancy (NV) centers

Background:

  • Nitrogen vacancy (NV) centers in diamond are ultrasensitive magnetometers for nanoscale nuclear magnetic resonance (NMR) spectroscopy.
  • Current limitations include kHz-level spectral linewidth due to NV sensor coherence and molecular diffusion, hindering long nuclear coherence times.

Purpose of the Study:

  • To present a theoretical blueprint for a setup achieving high sensitivity and spectral resolution in nanoscale NMR spectroscopy.
  • To enable NMR spectroscopy with resolution limited only by nuclear spin coherence, comparable to conventional NMR.

Main Methods:

  • Utilizing near-surface NV centers for detecting nuclear polarization along an external magnetic field.
  • Employing lock-in detection techniques for phase-coherent signal averaging.
  • Leveraging NV centers as both NMR detectors and optical hyperpolarization sources, combined with Bayesian inference for signal processing.

Main Results:

  • Achieving sensitivity for detecting NMR signals from nano- to micron-scale samples.
  • Demonstrating spectral resolution limited by nuclear spin coherence.
  • Enabling nanoscale NMR spectroscopy on samples in the micromolar concentration range.

Conclusions:

  • The proposed setup significantly enhances sensitivity and spectral resolution for nanoscale NMR spectroscopy.
  • This advancement offers a powerful tool for analyzing minute samples, surpassing current state-of-the-art capabilities.