论文标题
在真空中干燥二氧化硅纳米颗粒
Dry launching of silica nanoparticles in vacuum
论文作者
论文摘要
在超高真空中运行的悬浮光学机械实验需要进行半径的清洁二氧化硅纳米颗粒。我们提出了一种廉价而简单的实验方法，用于从聚氟乙烯（PTFE）表面摇动二氧化硅纳米颗粒。我们报告了最小半径为43 nm的单个二氧化硅纳米颗粒的成功发射，这是由于低陈述到发射表面而实现的。纳米颗粒具有43 nm和71.5 nm的纳米颗粒，其发射高通量和$ \ sim \ pm pm 10^\ circ $的较高的角度散布，这使得在几分钟内捕获了紧密浓缩的光学镊子。测得的速度明显小于1 m/s。所证明的发射方法允许在（超高）高真空中控制干燥的纳米颗粒，其半径为43 nm，尽管我们预计较小尺寸的载荷同样可行。
Clean loading of silica nanoparticles with a radius as small as ~50 nm is required for experiments in levitated optomechanics that operate in ultra-high vacuum. We present a cheap and simple experimental method for dry launching of silica nanoparticles by shaking from a polytetrafluoroethylene (PTFE) surface. We report on the successful launching of single silica nanoparticles with a minimum radius of 43 nm, which is enabled by the low stiction to the launching surface. Nanoparticles with radii of 43 nm and 71.5 nm are launched with a high flux and small angular spread of $\sim \pm 10^\circ$, which allows for trapping in a tightly focused optical tweezer within a couple of minutes. The measured velocities are significantly smaller than 1 m/s. The demonstrated launching method allows for controlled loading of dry nanoparticles with radii as small as 43 nm into optical traps in (ultra-)high vacuum, although we anticipate that loading of smaller sizes is equally feasible.
