论文标题
基于光学偶极力陷阱的释放和重新捕获的空气中微粒质量的快速质量测定技术
Technique for rapid mass determination of airborne micro-particles based on release and recapture from an optical dipole force trap
论文作者
论文摘要
我们描述了一种新方法，用于快速确定限制在自由空间光学偶极子陷阱中的颗粒质量。该技术依赖于无需真空环境而无需直接成像进行落和馆实验的成像。在这些实验中，用声学调节剂快速闭合捕获光，从而导致粒子从诱捕力中释放并随后重新捕获。使用高速CMOS传感器成像的瀑布和修复体的轨迹都合并以确定粒子质量。我们使用捕获颗粒的位置自相关函数的分析来证实这些测量值。我们使用大约90秒的数据采集时间报告了$ 5 \ times10^{ - 14} $ kg的群众统计不确定性小于2％。
We describe a new method for the rapid determination of the mass of particles confined in a free-space optical dipole-force trap. The technique relies on direct imaging of drop-and-restore experiments without the need for a vacuum environment. In these experiments, the trapping light is rapidly shuttered with an acousto-optic modulator causing the particle to be released from and subsequently recaptured by the trapping force. The trajectories of both the falls and restorations, imaged using a high-speed CMOS sensor, are combined to determine the particle mass. We corroborate these measurements using an analysis of position autocorrelation functions of the trapped particles. We report a statistical uncertainty of less than 2% for masses on the order of $5\times10^{-14}$ kg using a data acquisition time of approximately 90 seconds.
