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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Abstract

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
Volume8
Issue number4
Early online date12-Apr-2023
DOIs
Publication statusPublished - 28-Apr-2023

Keywords

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

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