Long-Lived Ensembles of Shallow NV– Centers in Flat and Nanostructured Diamonds by Photoconversion,ACS Applied Materials & Interfaces

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Long-Lived Ensembles of Shallow NV– Centers in Flat and Nanostructured Diamonds by Photoconversion
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-09-01 , DOI: 10.1021/acsami.1c09825
Federico Gorrini _{1,

2} , Carla Dorigoni ₃ , Domingo Olivares-Postigo _{2,

3,

4} , Rakshyakar Giri ₃ , Pietro Aprà _{5,

6} , Federico Picollo _{5,

6} , Angelo Bifone _{1,

2,

4}

Affiliation

Shallow, negatively charged nitrogen-vacancy centers (NV^–) in diamond have been proposed for high-sensitivity magnetometry and spin-polarization transfer applications. However, surface effects tend to favor and stabilize the less useful neutral form, the NV⁰ centers. Here, we report the effects of green laser irradiation on ensembles of nanometer-shallow NV centers in flat and nanostructured diamond surfaces as a function of laser power in a range not previously explored (up to 150 mW/μm²). Fluorescence spectroscopy, optically detected magnetic resonance (ODMR), and charge-photoconversion detection are applied to characterize the properties and dynamics of NV^– and NV⁰ centers. We demonstrate that high laser power strongly promotes photoconversion of NV⁰ to NV^– centers. Surprisingly, the excess NV^– population is stable over a timescale of 100 ms after switching off the laser, resulting in long-lived enrichment of shallow NV^–. The beneficial effect of photoconversion is less marked in nanostructured samples. Our results are important to inform the design of samples and experimental procedures for applications relying on ensembles of shallow NV^– centers in diamond.

中文翻译：

通过光转换在扁平和纳米结构钻石中形成浅层 NV 中心的长寿命集合

金刚石中的浅层带负电荷的氮空位中心 (NV ^– ) 已被提议用于高灵敏度磁力测定和自旋极化转移应用。然而，表面效应倾向于支持和稳定不太有用的中性形式，即 NV ⁰中心。在这里，我们报告了绿色激光照射对平面和纳米结构金刚石表面中纳米浅层 NV 中心集合的影响，作为以前未探索过的范围内（高达 150 mW/μm ²）的激光功率的函数。应用荧光光谱、光学检测磁共振 (ODMR) 和电荷光转换检测来表征 NV ^–和 NV ⁰的特性和动力学中心。我们证明高激光功率强烈促进了 NV ⁰到 NV ^-中心的光转换。令人惊讶的是，在关闭激光后 100 ms 的时间尺度内，过量的 NV ^–种群是稳定的，从而导致浅层 NV ^{– 的}长期富集。光转换的有益效果在纳米结构样品中不太明显。我们的结果对于依赖于浅层 NV ^-金刚石中心的集合的应用程序的样品设计和实验程序非常重要。

更新日期：2021-09-15

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