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Area of Science:

  • Quantum Sensing
  • Nanotechnology
  • Biophysics

Background:

  • Advancements in nanoscale fabrication necessitate atomic-scale measurement techniques.
  • Nitrogen-vacancy (NV) defects in diamond offer unique atomic-sized sensors for precision measurements under ambient conditions.

Purpose of the Study:

  • To develop and validate a projection-reconstruction method for retrieving the 3D structure of single molecules.
  • To demonstrate the capability of NV spin-based sensors for molecular structure microscopy.

Main Methods:

  • Utilizing NV defects in diamond as sensors for precision measurements.
  • Employing a projection-reconstruction algorithm to analyze nuclear spin noise signatures.
  • Validating the method through numerical simulations and reconstruction of a molecular phantom.

Main Results:

  • Successfully retrieved the 3D structure of a single molecule from nuclear spin noise.
  • Reconstructed the characteristic toroidal shape of a β-cyclodextrin molecular phantom.
  • Demonstrated the feasibility of an NV spin-based molecular structure microscope.

Conclusions:

  • The developed projection-reconstruction method enables 3D molecular structure imaging using NV diamond sensors.
  • This technique holds significant potential for nanoscale sensing and imaging of biomolecules.
  • Advances in NV spin sensing open new avenues for molecular structure determination.