Role of oxygen in laser-induced contamination at diamond-vacuum interfaces

IF 3.8 2区 物理与天体物理 Q2 PHYSICS, APPLIED
Shreyas Parthasarathy, Maxime Joos, Lillian B. Hughes, Simon A. Meynell, Taylor A. Morrison, J.D. Risner-Jamtgaard, David M. Weld, Kunal Mukherjee, Ania C. Bleszynski Jayich
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Abstract

Many modern-day quantum science experiments rely on high-fidelity measurement of fluorescent signals emitted by the quantum system under study. A pernicious issue encountered when such experiments are conducted near a material interface in vacuum is “laser-induced contamination” (LIC): the gradual accretion of fluorescent contaminants on the surface where a laser is focused. Fluorescence from these contaminants can entirely drown out any signal from, e.g., optically probed color centers in the solid state. Crucially, while LIC appears often in this context, it has not been systematically studied. In this work, we probe the onset and growth rate of LIC for a diamond nitrogen-vacancy center experiment in vacuum, and we correlate the contamination-induced fluorescence intensities to micron-scale physical buildup of contaminant on the diamond surface. Drawing upon similar phenomena previously studied in the space optics community, we use photocatalyzed oxidation of contaminants as a mitigation strategy. We vary the residual oxygen pressure over 9 orders of magnitude and find that LIC growth is inhibited at near-atmospheric oxygen partial pressures, but the growth rate at lower oxygen pressure is nonmonotonic. Finally, we discuss a model for the observed dependence of LIC growth rate on oxygen content and propose methods to extend in situ mitigation of LIC to a wider range of operating pressures.

Abstract Image

氧气在金刚石-真空界面激光诱导污染中的作用
许多现代量子科学实验都依赖于对所研究量子系统发出的荧光信号进行高保真测量。在真空中靠近材料界面进行此类实验时,会遇到一个有害的问题,即 "激光诱导污染"(LIC):在激光聚焦的表面会逐渐积累荧光污染物。这些污染物产生的荧光会完全淹没固态中光学探测颜色中心等产生的任何信号。最重要的是,虽然 LIC 经常出现在这种情况下,但我们还没有对它进行过系统的研究。在这项研究中,我们探究了在真空中进行的金刚石氮空位中心实验中 LIC 的发生和增长速度,并将污染引起的荧光强度与金刚石表面污染物的微米级物理堆积联系起来。借鉴空间光学界以前研究过的类似现象,我们将污染物的光催化氧化作为一种缓解策略。我们改变了 9 个数量级的残余氧压,发现在接近大气层的氧分压下,LIC 的生长受到抑制,但在较低氧压下的生长率是非单调的。最后,我们讨论了观察到的 LIC 生长率与氧气含量依赖关系的模型,并提出了将原位缓解 LIC 的方法扩展到更大的工作压力范围的建议。
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来源期刊
Physical Review Applied
Physical Review Applied PHYSICS, APPLIED-
CiteScore
7.80
自引率
8.70%
发文量
760
审稿时长
2.5 months
期刊介绍: Physical Review Applied (PRApplied) publishes high-quality papers that bridge the gap between engineering and physics, and between current and future technologies. PRApplied welcomes papers from both the engineering and physics communities, in academia and industry. PRApplied focuses on topics including: Biophysics, bioelectronics, and biomedical engineering, Device physics, Electronics, Technology to harvest, store, and transmit energy, focusing on renewable energy technologies, Geophysics and space science, Industrial physics, Magnetism and spintronics, Metamaterials, Microfluidics, Nonlinear dynamics and pattern formation in natural or manufactured systems, Nanoscience and nanotechnology, Optics, optoelectronics, photonics, and photonic devices, Quantum information processing, both algorithms and hardware, Soft matter physics, including granular and complex fluids and active matter.
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