Fast, Broad-Band Magnetic Resonance Spectroscopy with Diamond Widefield Relaxometry

Charles Mignon, Ari R. Ortiz Moreno, Hoda Shirzad, Sandeep K. Padamati, Viraj G. Damle, Yori Ong, Romana Schirhagl*, Mayeul Chipaux*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
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We present an alternative to conventional Electron Paramagnetic Resonance (EPR) spectroscopy equipment. Avoiding the use of bulky magnets and magnetron equipment, we use the photoluminescence of an ensemble of Nitrogen-Vacancy centers at the surface of a diamond. Monitoring their relaxation time (or T1), we detected their cross-relaxation with a compound of interest. In addition, the EPR spectra are encoded through a localized magnetic field gradient. While recording previous data took 12 min per data point with individual NV centers, we were able to reconstruct a full spectrum at once in 3 s, over a range from 3 to 11 G. In terms of sensitivity, only 0.5 μL of a 1 μM hexaaquacopper(II) ion solution was necessary.

Original languageEnglish
Pages (from-to)1667–1675
Number of pages9
JournalACS Sensors
Issue number4
Early online date12-Apr-2023
Publication statusPublished - 28-Apr-2023


  • Cross-relaxation
  • Diamond Nitrogen-Vacancy Centers
  • Electron Paramagnetic Resonance
  • Optically Detected Magnetic Resonance
  • Quantum Sensing
  • Spin Relaxometry

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