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arXiv physics/0607216physics.optics
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光镊中全光angular momentum传递的测量

Measurement of the total optical angular momentum transfer in optical tweezers

Simon Parkin, Gregor Knoener, Timo A. Nieminen, Norman R. Heckenberg, Halina Rubinsztein-Dunlop

摘要:

我们描述了一种方法来确定总的角动量,自旋和轨道,转移到一个粒子被困在光镊。例如,具有不同圆偏振度的激光束的LG02模式用于捕获和旋转具有明确定义的几何形状的细长颗粒。该方法成功地估计了施加到颗粒的总光学扭矩。对于这种技术,不需要测量颗粒上的粘性阻力,因为它是一种光学测量。因此,不需要了解颗粒的尺寸和形状以及流体的粘度。

英文摘要:

We describe a way to determine the total angular momentum, both spin and orbital, transferred to a particle trapped in optical tweezers. As an example an LG02 mode of a laser beam with varying degrees of circular polarisation is used to trap and rotate an elongated particle with a well defined geometry. The method successfully estimates the total optical torque applied to the particle. For this technique, there is no need to measure the viscous drag on the particle, as it is an optical measurement. Therefore, knowledge of the particle's size and shape, as well as the fluid's viscosity, is not required.

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