各向同性非吸收材料微粒的光学应用及扭矩测量
Optical application and measurement of torque on microparticles of isotropic nonabsorbing material
摘要：
我们展示了如何能够可控地旋转或对齐微观粒子的各向同性非吸收材料在TEM 00高斯光束陷阱，同时测量所施加的扭矩，使用纯光学手段。这是一种简单而通用的旋转方法，只需要粒子沿一个方向伸长。因此，该方法可用于旋转或排列各种自然存在的颗粒。测量所施加的扭矩的能力使得能够使用这种方法作为定量工具-基于力测量的光镊的旋转等效物。除了对生物样品的旋转具有特殊价值外，这种方法也适用于光学驱动微机械的发展。
英文摘要：
We show how it is possible to controllably rotate or align microscopic particles of isotropic nonabsorbing material in a TEM00 Gaussian beam trap, with simultaneous measurement of the applied torque using purely optical means. This is a simple and general method of rotation, requiring only that the particle is elongated along one direction. Thus, this method can be used to rotate or align a wide range of naturally occurring particles. The ability to measure the applied torque enables the use of this method as a quantitative tool--the rotational equivalent of optical tweezers based force measurement. As well as being of particular value for the rotation of biological specimens, this method is also suitable for the development of optically-driven micromachines.
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