Broadband magnetometry by infrared-absorption detection of diamond NV centers and associated temperature dependence

Victor M. Acosta; Andrey Jarmola; Lucas J. Zipp; M. P. Ledbetter; E. Bauch; Dmitry Budker

doi:10.1117/12.872624

12 February 2011 Broadband magnetometry by infrared-absorption detection of diamond NV centers and associated temperature dependence

Victor M. Acosta, Andrey Jarmola, Lucas J. Zipp, M. P. Ledbetter, E. Bauch, Dmitry Budker

Author Affiliations +

Proceedings Volume 7948, Advances in Photonics of Quantum Computing, Memory, and Communication IV; 79480W (2011) https://doi.org/10.1117/12.872624
Event: SPIE OPTO, 2011, San Francisco, California, United States

Abstract

We demonstrate magnetometry by detection of the spin state of high-density nitrogen-vacancy (NV) ensembles in diamond using optical absorption at 1042 nm. With this technique, measurement contrast and collection efficiency can approach unity, leading to an increase in magnetic sensitivity compared to the more common method of collecting red fluorescence. Working at 75 K with a sensor with effective volume 50x50x300 μm³, we project photon shot-noise limited sensitivity of 5 pT in one second of acquisition and bandwidth from DC to a few MHz. Operation in a gradiometer configuration yields a noise floor of 7 nT_rms at ~110 Hz in one second of acquisition. We also present measurements of the zero-field splitting parameters as a function of temperature, a calibration which is essential for ultra-sensitive magnetometry at low frequencies.

Citation Download Citation

Victor M. Acosta, Andrey Jarmola, Lucas J. Zipp, M. P. Ledbetter, E. Bauch, and Dmitry Budker "Broadband magnetometry by infrared-absorption detection of diamond NV centers and associated temperature dependence", Proc. SPIE 7948, Advances in Photonics of Quantum Computing, Memory, and Communication IV, 79480W (12 February 2011); https://doi.org/10.1117/12.872624

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