Quantum diamond microscope for dynamic imaging of magnetic fields
Abstract
Wide-field imaging of magnetic signals using ensembles of nitrogen-vacancy (NV) centers in diamond has garnered increasing interest due to its combination of micron-scale resolution, millimeter-scale field of view, and compatibility with diverse samples from across the physical and life sciences. Recently, wide-field NV magnetic imaging based on the Ramsey protocol has achieved uniform and enhanced sensitivity compared to conventional measurements. Here, we integrate the Ramsey-based protocol with spin-bath driving to extend the NV spin dephasing time and improve magnetic sensitivity. We also employ a high-speed camera to enable dynamic wide-field magnetic imaging. We benchmark the utility of this quantum diamond microscope (QDM) by imaging magnetic fields produced from a fabricated wire phantom. Over a 270 × 270 μm2 field of view, a median per-pixel magnetic sensitivity of 4.1(1) nT /Hz is realized with a spatial resolution ≲ 10 μm and sub-millisecond temporal resolution. Importantly, the spatial magnetic noise floor can be reduced to the picotesla scale by time-averaging and signal modulation, which enables imaging of a magnetic-field pattern with a peak-to-peak amplitude difference of about 300 pT. Finally, we discuss potential new applications of this dynamic QDM in studying biomineralization and electrically active cells.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 17, 2023
- Source ID
- 10.1116/5.0176317
Entities
People
- Connor Hart
- Jennifer M. Schloss
- Jiashen Tang
- Jner Tzern Oon
- John W Blanchard
- Matthew J. Turner
- Ronald L. Walsworth
- Smriti Bhalerao
- Zechuan Yin
Organizations
- Air Force Office of Scientific Research
- Army Research Office
- Gordon and Betty Moore Foundation
- Massachusetts Institute of Technology
- National Science Foundation
- United States Army Research Laboratory
- University of Maryland