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Proceedings Paper

Broadband magnetometry by infrared-absorption detection of diamond NV centers and associated temperature dependence
Author(s): Victor M. Acosta; Andrey Jarmola; Lucas J. Zipp; M. P. Ledbetter; E. Bauch; Dmitry Budker
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Paper 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 nTrms 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.

Paper Details

Date Published: 12 February 2011
PDF: 9 pages
Proc. SPIE 7948, Advances in Photonics of Quantum Computing, Memory, and Communication IV, 79480W (12 February 2011); doi: 10.1117/12.872624
Show Author Affiliations
Victor M. Acosta, Univ. of California, Berkeley (United States)
Andrey Jarmola, Univ. of California, Berkeley (United States)
Lucas J. Zipp, Univ. of California, Berkeley (United States)
M. P. Ledbetter, Univ. of California, Berkeley (United States)
E. Bauch, Univ. of California, Berkeley (United States)
Dmitry Budker, Univ. of California, Berkeley (United States)
Lawrence Berkeley National Lab. (United States)


Published in SPIE Proceedings Vol. 7948:
Advances in Photonics of Quantum Computing, Memory, and Communication IV
Zameer Ul Hasan; Philip R. Hemmer; Hwang Lee; Charles M. Santori, Editor(s)

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