arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2301.08712cond-mat.mes-hallcond-mat.mtrl-scicond-mat.other
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一种高效低成本的在CVD金刚石中制备高密度氮-空位中心的方法用于传感应用

An efficient and low-cost method to create high-density nitrogen-vacancy centers in CVD diamond for sensing applications

Prem Bahadur Karki, Rupak Timalsina, Mohammadjavad Dowran, Ayodimeji E. Aregbesola, Abdelghani Laraoui, Kapildeb Ambal

AI总结:

提出一种基于Ar+等离子体高能光子的高效低成本方法,在低氮浓度CVD金刚石中制备高密度NV-中心,实现高灵敏度磁场传感。

摘要:

金刚石中带负电的氮-空位(NV-)中心是最通用且最稳健的量子传感器之一,适用于量子技术,包括磁场和温度传感器。对于精密传感应用,在小体积内密集排列的NV-中心是优选的,因为其受益于1/N^1/2的灵敏度增强(N是传感NV中心的数量)以及NV中心的高效激发。然而,快速高效地形成高浓度NV-中心的方法仍处于开发阶段。我们报告了一种高效、低成本的方法,基于Ar+等离子体的高能光子,从相对较低的氮浓度中制备高密度NV-中心。该研究在IIa型、单晶、CVD生长的金刚石衬底上进行,其生长态氮浓度为1 ppm。基于光探测磁共振和荧光共聚焦显微镜测量,我们估计NV-密度约为0.57 ppm(57%),均匀分布在面向等离子体源的金刚石表面以下200微米深度内。所制备的NV-具有5 ms的自旋-晶格弛豫时间(T1)和4微秒的自旋-自旋相干时间(T2)。我们测量到直流磁场灵敏度约为104 nT Hz^-1/2,交流磁场灵敏度约为0.12 pT Hz^-1/2,并展示了使用0.2微米^3的有效样品体积,以超过10 mT s^-1的速率进行实时磁场传感。

英文摘要:

The negatively charged Nitrogen-Vacancy (NV-) center in diamond is one of the most versatile and robust quantum sensors suitable for quantum technologies, including magnetic field and temperature sensors. For precision sensing applications, densely packed NV- centers within a small volume are preferable due to benefiting from 1/N^1/2 sensitivity enhancement (N is the number of sensing NV centers) and efficient excitation of NV centers. However, methods for quickly and efficiently forming high concentrations of NV- centers are in development stage. We report an efficient, low-cost method for creating high-density NV- centers production from a relatively low nitrogen concentration based on high-energy photons from Ar+ plasma. This study was done on type-IIa, single crystal, CVD-grown diamond substrates with an as-grown nitrogen concentration of 1 ppm. We estimate an NV- density of ~ 0.57 ppm (57%) distributed homogeneously over 200 um deep from the diamond surface facing the plasma source based on optically detected magnetic resonance and fluorescence confocal microscopy measurements. The created NV-s have a spin-lattice relaxation time (T1) of 5 ms and a spin-spin coherence time (T2) of 4 us. We measure a DC magnetic field sensitivity of ~ 104 nT Hz^-1/2, an AC magnetic field sensitivity of ~ 0.12 pT Hz^-1/2, and demonstrate real-time magnetic field sensing at a rate over 10 mT s-1 using an active sample volume of 0.2 um3.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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