|
内容記述 |
Fluorescent nanodiamonds (FNDs) containing negatively charged nitrogen-vacancy (NV-) centers are vital formany emerging quantum sensing applications from magnetometry to intracellular sensing in biology. However,developing a scalable fabrication method for FNDs hosting color centers with consistent bulk-likephotoluminescence (PL) and spin coherence properties remains a highly desired but unrealized goal. Here, weinvestigate optimized ball milling of single-crystal diamonds produced via chemical vapor deposition (CVD) andcontaining 2 ppm of substitutional nitrogen and 0.3 ppm of NV- to achieve this goal. The NV charge state, PLlifetime, and spin properties of bulk CVD diamond samples are directly compared to milled CVD FNDs andcommercial high-pressure high-temperature (HPHT) FNDs. We find that on average, the relative contribution ofthe NV- charge state to the total NV PL is lower and the NV PL lifetime is longer in CVD FNDs compared toHPHT FNDs, both likely due to the lower Nsaverage show similar average T1 spin relaxation times of 3.2 ± 0.7 ms and 4.7 ±1.6 ms, respectively, compared tothe large-scale fabrication of NV ensembles in FNDs with bulk-like T1 spin relaxation properties. |
