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arXiv 2202.09051physics.optics
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适用于光阱粒子的全息扭矩测量

Generally applicable holographic torque measurement for optically trapped particles

Franziska Strasser, Stephen M. Barnett, Monika Ritsch-Marte, Gregor Thalhammer

摘要:

本文提出了一种测量任意形状粒子在光阱中所受光矩的方法,该方法是由粒子引起的光的角动量变化来推断的。所有扭矩分量可以从由高NA聚光器的后焦平面中的相机记录的单个干涉图案来确定,所述相机收集所有前向散射光。我们推导出明确的表达式映射在这个平面上的扭矩分量的测量复杂的字段。所需的相位检索的迭代算法,使用已知的光阱的位置作为约束。与单个粒子有关的扭矩是可访问的,以及总扭矩的单独自旋或轨道部分。

英文摘要:

We present a method to measure the optical torque applied to particles of arbitrary shape held in an optical trap, inferred from the change of angular momentum of light induced by the particle. All torque components can be determined from a single interference pattern recorded by a camera in the back focal plane of a high-NA condenser collecting all forward scattered light. We derive explicit expressions mapping the measured complex field in this plane to the torque components. The required phase is retrieved by an iterative algorithm, using the known position of the optical traps as constraints. The torque pertaining to individual particles is accessible, as well as separate spin or orbital parts of the total torque.

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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