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  4. Fast, Broad-Band Magnetic Resonance Spectroscopy with Diamond Widefield Relaxometry
 
research article

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

Mignon, Charles
•
Moreno, Ari R. Ortiz
•
Shirzad, Hoda  
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April 12, 2023
Acs Sensors

We present an alternative to conventional Electron 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 mu L of a 1 mu M hexaaquacopper(II) ion solution was necessary.

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