We developed a versatile Quasi-finite-element scanning method to analyse the concentration and homogeneity of the ensembles of nitrogen-vacancy (NV⁻) centres in block diamonds. In this method, area of the bulk diamond with high-density NV⁻ centres was divided into small pieces at the nanoscale by using a focused light beam. The concentration of NV⁻ centres was obtained and imaged through the fluorescence intensity of each pixel by employing a home-built spectrometer. In addition, global and local homogeneities were introduced to evaluate the NV⁻ centre distribution. NV⁻ centres in a specific pixel exhibited preferred direction growth peaks attributed to the diamond crystal orientation. Moreover, the uniformity of NV⁻ centres was not proportional to the electron irradiation duration, but an optimal time was observed. This study can be beneficial for enhancing the sensitivities of bulk magnetometry based on confocal systems.

我们开发了一种通用的准有限元扫描方法来分析块状钻石中氮空位 (NV ^{- ) 中心集合的浓度和均匀性。}在该方法中，通过使用聚焦光束将具有高密度 NV ^-中心的块状金刚石区域在纳米级分成小块。通过使用自制光谱仪，通过每个像素的荧光强度获得和成像NV ^{-中心的浓度。}此外，还引入了全局和局部同质性来评估 NV ^-中心分布。内华达州^-特定像素中的中心表现出归因于金刚石晶体取向的优选方向生长峰。此外，NV ^-中心的均匀性与电子辐照持续时间不成比例，但观察到最佳时间。这项研究有助于提高基于共焦系统的体磁力测量的灵敏度。