Journal
EPJ QUANTUM TECHNOLOGY
Volume 7, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1140/epjqt/s40507-020-00088-2
Keywords
NV centers; Quantum sensing; Magnetic measurements
Funding
- European Commision [828946]
- EMPIR [EMPIR-17FUN06, 17FUN01]
- Piemonte Quantum Enabling Technologies (PiQuET) by the Piemonte Region
- International Atomic Energy Agency (IAEA) [F11020]
- Departments of Excellence Project [L. 232/2016]
- MIUR
- National Collaborative Research Infrastructure Strategy (NCRIS) programme by the Australian Government-Department of Education, Skill and Employment
- University of Torino
- Compagnia di SanPaolo Foundation
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We present an innovative experimental set-up that uses Nitrogen-Vacancy centres in diamonds to measure magnetic fields with the sensitivity of eta = 68 +/- 3 nT/root Hz at demonstrated (sub)cellular scale. The presented method of magnetic sensing, utilizing a lock-in based ODMR technique for the optical detection of microwave-driven spin resonances induced in NV centers, is characterized by the excellent magnetic sensitivity at such small scale and the full biocompatibility. The cellular scale is obtained using a NV-rich sensing layer of 15 nm thickness along z axis and a focused laser spot of (10x10) mu m(2) in x-y plane. The biocompatibility derives from an accurate choice of the applied optical power. For this regard, we also report how the magnetic sensitivity changes for different applied laser power and discuss the limits of the sensitivity sustainable with biosystem at such small volume scale. As such, this method offers a whole range of research possibilities for biosciences.
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