Stability of Near-Surface Nitrogen Vacancy Centers Using Dielectric Surface Passivation.

Autor: Kumar R; London Centre for Nanotechnology, UCL, London WC1H 0AH, U.K., Mahajan S; Department of Electronic & Electrical Engineering, UCL, London WC1E 7JE, U.K., Donaldson F; London Centre for Nanotechnology, UCL, London WC1H 0AH, U.K., Dhomkar S; London Centre for Nanotechnology, UCL, London WC1H 0AH, U.K.; Department of Physics, IIT Madras, Chennai 600036, India.; Center for Quantum Information, Communication and Computing, IIT Madras, Chennai 600036, India., Lancaster HJ; Department of Physics and Astronomy, UCL, London WC1E 6BT, U.K., Kalha C; Department of Chemistry, UCL, 20 Gordon Street, London WC1H 0AJ, U.K., Riaz AA; Department of Chemistry, UCL, 20 Gordon Street, London WC1H 0AJ, U.K., Zhu Y; Department of Chemistry, UCL, 20 Gordon Street, London WC1H 0AJ, U.K., Howard CA; Department of Physics and Astronomy, UCL, London WC1E 6BT, U.K., Regoutz A; Department of Chemistry, UCL, 20 Gordon Street, London WC1H 0AJ, U.K., Morton JJL; London Centre for Nanotechnology, UCL, London WC1H 0AH, U.K.; Department of Electronic & Electrical Engineering, UCL, London WC1E 7JE, U.K.
Jazyk: angličtina
Zdroj: ACS photonics [ACS Photonics] 2024 Feb 14; Vol. 11 (3), pp. 1244-1251. Date of Electronic Publication: 2024 Feb 14 (Print Publication: 2024).
DOI: 10.1021/acsphotonics.3c01773
Abstrakt: We study the photophysical stability of ensemble near-surface nitrogen vacancy (NV) centers in diamond under vacuum and air. The optically detected magnetic resonance contrast of the NV centers was measured following exposure to laser illumination, showing opposing trends in air compared to vacuum (increasing by up to 9% and dropping by up to 25%, respectively). Characterization using X-ray photoelectron spectroscopy (XPS) suggests a surface reconstruction: In air, atmospheric oxygen adsorption on a surface leads to an increase in NV - fraction, whereas in vacuum, net oxygen desorption increases the NV 0 fraction. NV charge state switching is confirmed by photoluminescence spectroscopy. Deposition of ∼2 nm alumina (Al 2 O 3 ) over the diamond surface was shown to stabilize the NV charge state under illumination in either environment, attributed to a more stable surface electronegativity. The use of an alumina coating on diamond is therefore a promising approach to improve the resilience of NV sensors.
Competing Interests: The authors declare no competing financial interest.
(© 2024 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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