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- Publisher
- American Physical Society (APS)
- Copyright
- Copyright © 2004 The American Physical Society
- ISSN
- 1079-7114
- DOI
- 10.1103/PhysRevLett.92.190801
- pmid
- 15169392
- Publisher site
- See Article on Publisher Site
Abstract
We describe an apparatus that can measure the instantaneous angular displacement and torque applied to a quartz particle which is angularly trapped. Torque is measured by detecting the change in angular momentum of the transmitted trap beam. The rotational Brownian motion of the trapped particle and its power spectral density are used to determine the angular trap stiffness. The apparatus features a feedback control that clamps torque or other rotational quantities. The torque sensitivity demonstrated is ideal for the study of known biological molecular motors.
Journal
Physical Review Letters – American Physical Society (APS)
Published: May 14, 2004