Technique for Rapid Mass Determination of Airborne Microparticles Based on Release and Recapture from an Optical Dipole Force Trap

G. Carlse, K. Borsos, H. Beica, T. Vacheresse, A. Pouliot, J. Pérez-García, A. Vorozcovs, B. Barron, S. Jackson, L. Marmet, A. Kumarakrishnan
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引用次数: 5

Abstract

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.
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基于光学偶极子力阱释放和捕获的空气微粒快速质量测定技术
我们描述了一种快速测定自由空间光学偶极子力阱中粒子质量的新方法。该技术依赖于直接成像的跌落和恢复实验,而不需要真空环境。在这些实验中,用声光调制器迅速关闭捕获光,使粒子从捕获力中释放出来,随后被捕获力重新捕获。下落和恢复的轨迹,使用高速CMOS传感器成像,结合起来确定粒子质量。我们通过对捕获粒子的位置自相关函数的分析来证实这些测量结果。我们报告的统计不确定性小于2%,质量为$5\乘以10^{-14}$ kg,使用大约90秒的数据采集时间。
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