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  • Letter
  • Open Access

Microscale sensing with strongly interacting NV ensembles at high fields

Ainitze Biteri-Uribarren*, Ana Martin, and Jorge Casanova

  • *Contact author: ainitzebiteriuribarren@gmail.com
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Phys. Rev. Research 7, L042016 – Published 16 October, 2025

DOI: https://doi.org/10.1103/jksj-736v

Abstract

Advances in sensing devices that utilize nitrogen-vacancy (NV) center ensembles in diamond are driving progress in microscale nuclear magnetic resonance spectroscopy. Utilizing quantum sensing techniques in the high-field regime significantly boosts sensitivity by increasing thermal polarization and improves spectral quality via enhanced energy shifts. Compatible with the latter, a straightforward manner to further raise sensor sensitivity is to increase NV concentration, although this intensifies detrimental dipole-dipole interactions among NVs. In this Letter, we present a method for detecting NMR signals in high-field scenarios while effectively suppressing dipole-dipole couplings in the NV ensemble. Thus, this approach enhances sensitivity by combining highly doped diamond substrates and elevated magnetic fields.

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Phys. Rev. Research 7, L042016– Published 16 October, 2025
  • Received 7 November 2024
  • Accepted 16 September 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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