Pump-Enhanced Continuous-Wave Magnetometry Using Nitrogen-Vacancy Ensembles

Sepehr Ahmadi, Haitham A. R. El-Ella, Jørn Otto Bindslev Hansen, Alexander Huck, Ulrik Lund Andersen

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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.
Original languageEnglish
Article number034001
JournalPhysical Review Applied
Issue number3
Number of pages10
Publication statusPublished - 2017

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© 2017 American Physical Society

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