High-precision measurements of light-induced torque on absorbing microspheres

被引：22

作者：

Capitanio, M

Normanno, D

Pavone, FS

机构：

[1] Univ Florence, European Lab Nonlinear Spect, I-50019 Florence, Italy

[2] Inst Nazl Fis Mat, Sez Firenze, I-50019 Florence, Italy

来源：

OPTICS LETTERS | 2004年 / 29卷 / 19期

关键词：

D O I：

10.1364/OL.29.002231

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Laser beams have been demonstrated to be capable of exerting torque as well as forces on microparticles. Using a custom magneto-optic manipulator, we directly measured the torque exerted by laser light on absorbing microspheres as a result of the transfer of spin angular momentum. A general method for measuring torque has been developed, and the experimental apparatus has shown a sensitivity of similar to1 pN/nm. (C) 2004 Optical Society of America.

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页码：2231 / 2233

页数：3

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