Enhancing quantum sensing performance by optimizing the concentration and dephasing time of the NV ensemble in CVD-diamond

作者：Wang, Sixian; Bian, Guodong^*; Fan, Pengcheng; Li, Mingxin; Li, Bo; Yuan, Heng

来源：The Loyola University Chicago International Law Review, 2023, 13(2): 393-402.

DOI：10.1364/OME.478924

• RADIATION-DAMAGE
• ELECTRON
• CENTERS

The negatively charged nitrogen-vacancy (NV-) center ensembles in diamonds offer enormous potential for developing integrated sensors with an improved signal-to-noise ratio (SNR) and high sensitivity. However, the preparation and treatment of diamond samples with suitable NV- concentrations and dephasing time have remained challenging. This work provided insight into the NV- center formation mechanism and reconstruction via a comprehensive analysis of the concentration and dephasing time of a set of diamond samples treated by various parameters. By varying the electron irradiation dose and subsequent annealing duration, the conversion rate of nitrogen to NV- is up to 18.45%, and the corresponding maximum NV- concentration is 3.69 ppm. The dephasing time for all samples varies around 300 ns. The nitrogen-related NV- center ensemble dephasing rate per unit density is 146.4 (ppm center dot ms)-1, indicating that the treatment did not substantially alter the paramagnetic spin environment around the NV- center. This study not only offers support to exquisite sensitivities of NV-based sensors but also provides valuable experience for the preparation of unique properties of synthetic diamonds.

• 单位
  北京航空航天大学