Optical measurement of torque exerted on an elongated object by a noncircular laser beam
Optical measurement of torque exerted on an elongated object by a noncircular laser beam
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通过非圆形激光束光学测量施加在细长物体上的扭矩
DOI：
10.1103/physreva.70.023816
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发表时间：
2004
影响因子：
2.9
通讯作者：
H. Rubinsztein
中科院分区：
文献类型：
--
作者：
S. Parkin;T. Nieminen;N. Heckenberg;H. Rubinsztein
我们开发了一种方案来测量光的扭矩，施加在一个相位物体上的激光束，通过测量轨道角动量的传输光束。由于轨道角动量被广泛用于对微观物体施加扭矩，因此该实验是对光学镊子中一种情况的宏观模拟。设计了一种产生LG02模式的全息图和CCD相机来检测光束的轨道分量。实验结果与理论数值计算一致，轨道分量的强度表明它在微操作光学镊子中是有用的。
We have developed a scheme to measure the optical torque, exerted by a laser beam on a phase object, by measuring the orbital angular momentum of the transmitted beam. The experiment is a macroscopic simulation of a situation in optical tweezers, as orbital angular momentum has been widely used to apply torque to microscopic objects. A hologram designed to generate LG02 modes and a CCD camera are used to detect the orbital component of the beam. Experimental results agree with theoretical numerical calculations, and the strength of the orbital component suggest its usefulness in optical tweezers for micromanipulation.