Measurement of the total optical angular momentum transfer in optical tweezers

被引：39

作者：

Parkin, Simon ^{[1
]}

Knoner, Gregor ^{[1
]}

Nieminen, Timo A. ^{[1
]}

Heckenberg, Norman R. ^{[1
]}

Rubinsztein-Dunlop, Halina ^{[1
]}

机构：

[1] Univ Queensland, Sch Phys Sci, Ctr Biophoton & Laser Sci, Brisbane, Qld 4072, Australia

来源：

OPTICS EXPRESS | 2006年 / 14卷 / 15期

关键词：

D O I：

10.1364/OE.14.006963

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

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 LG(02) 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. (c) 2006 Optical Society of America.

引用

页码：6963 / 6970

页数：8

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