Preprint article · Journal article
Pump-Enhanced Continuous-Wave Magnetometry Using Nitrogen-Vacancy Ensembles
Ensembles of nitrogen-vacancy centers in diamond are a highly promisingplatform for high-sensitivity magnetometry, whose efficacy is often based onefficiently generating and monitoring magnetic-field dependent infraredfluorescence. Here we report on an increased sensing efficiency with the use ofa 532-nm resonant confocal cavity and a microwave resonator antenna formeasuring the local magnetic noise density using the intrinsic nitrogen-vacancyconcentration of a chemical-vapor deposited single-crystal diamond.
We measurea near-shot-noise-limited magnetic noise floor of 200 pT√Hz spanning a bandwidth up to 159 Hz, and an extracted sensitivity ofapproximately 3 nT/√Hz, with further enhancement limited by thenoise floor of the lock-in amplifier and the laser damage threshold of theoptical components. Exploration of the microwave and optical pump-rateparameter space demonstrates a linewidth-narrowing regime reached by virtue ofusing the optical cavity, allowing an enhanced sensitivity to be achieved,despite an unoptimized collection efficiency of about 0.2 ppb.
Language: | English |
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Year: | 2017 |
Pages: | 10 |
ISSN: | 23317019 |
Types: | Preprint article and Journal article |
DOI: | 10.1103/PhysRevApplied.8.034001 |
ORCIDs: | Ahmadi, Sepehr , Hansen, Jørn Otto Bindslev , Huck, Alexander and Andersen, Ulrik Lund |