Measurement and Control of Optically Induced Rotation of Anisotropic Shaped Particles
- 1 June 1995
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 34 (6R)
- https://doi.org/10.1143/jjap.34.3104
Abstract
When a particle of anisotropic shape is trapped by a laser beam, it generally begins to rotate around itself. This self-rotation is caused by the torque resulting from total forces acting on the particle surface. We have measured the rotation rate rapidly and automatically from temporal variation of light scattered from the rotating particle. The rotation rate, which could be measured up to 2200 rpm, has been shown to be linearly dependent on the power of the trapping beam. We controlled the rotation rate by a feedback loop connecting the measured rotation rate and the trapping beam power.Keywords
This publication has 8 references indexed in Scilit:
- Optically induced rotation of anisotropic micro-objects fabricated by surface micromachiningApplied Physics Letters, 1994
- Multibeam laser manipulation and fixation of microparticlesApplied Physics Letters, 1992
- Pattern formation and flow control of fine particles by laser-scanning micromanipulationOptics Letters, 1991
- Optical trapping and rotational manipulation of microscopic particles and biological cells using higher-order mode Nd:YAG laser beamsElectronics Letters, 1991
- Force generation of organelle transport measured in vivo by an infrared laser trapNature, 1990
- Optical rotation of small particles by a circlarly-polarized laser beam in an optical microscope.Journal of the Spectroscopical Society of Japan, 1990
- Automated single-cell manipulation and sorting by light trappingApplied Optics, 1987
- Observation of a single-beam gradient force optical trap for dielectric particlesOptics Letters, 1986