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Fiber-coupled diamond magnetometry with an unshielded 30 pT/sqrt(Hz)) sensitivity
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Graham, Stuart, Rahman, A. T. M. A., Munn, L., Patel, R. L., Newman, A. J., Stephen, C. J., Colston, G., Nikitin, A., Edmonds, A. M., Twitchen, D. J., Markham, M. L. and Morley, G. W. (2023) Fiber-coupled diamond magnetometry with an unshielded 30 pT/sqrt(Hz)) sensitivity. Physical Review Applied, 19 (4). 044042 . doi:10.1103/PhysRevApplied.19.044042 ISSN 2331-7019.
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Official URL: https://doi.org/10.1103/PhysRevApplied.19.044042
Abstract
Ensembles of nitrogen-vacancy centers (NVCs) in diamond can be employed for sensitive magnetometry. In this work, we present a fiber-coupled NVC magnetometer with an unshielded sensitivity of (30±10)
pT/√Hz in a (10–500)-Hz frequency range. This sensitivity is enabled by a relatively high green-to-red photon conversion efficiency, the use of a [100] bias-field alignment, microwave and lock-in amplifier (LIA) parameter optimization, as well as a balanced hyperfine-excitation scheme. Furthermore, a silicon carbide (SiC) heat spreader is used for microwave delivery, alongside low-strain 1-mm312C diamonds, one of which is placed in a second magnetically insensitive fluorescence-collecting sensor head for common-mode noise cancellation. The magnetometer is capable of detecting signals from sources such as a vacuum pump up to 2 m away, with some orientation dependence but no complete dead zones, demonstrating its potential for use in remote-sensing applications.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Diamonds, Magnetic fields -- Measurement, Magnetic flux, Magnetometers, Magnetic shielding | |||||||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Physical Review Applied | |||||||||||||||||||||||||||||||||||||||||||||
Publisher: | American Physical Society | |||||||||||||||||||||||||||||||||||||||||||||
ISSN: | 2331-7019 | |||||||||||||||||||||||||||||||||||||||||||||
Official Date: | 14 April 2023 | |||||||||||||||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 19 | |||||||||||||||||||||||||||||||||||||||||||||
Number: | 4 | |||||||||||||||||||||||||||||||||||||||||||||
Article Number: | 044042 | |||||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevApplied.19.044042 | |||||||||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||||||||
Reuse Statement (publisher, data, author rights): | ||||||||||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||||||||||||||||||||
Copyright Holders: | © 2023 American Physical Society | |||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 25 April 2023 | |||||||||||||||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 25 April 2023 | |||||||||||||||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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