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

ABSTRACT: 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 NV⁰ fraction. NV charge state switching is confirmed by photoluminescence spectroscopy. Deposition of ∼2 nm alumina (Al₂O₃) over the diamond surface w

SUBMITTER: Kumar R 

PROVIDER: S-EPMC10958592 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature