Optical torque wrench: angular trapping, rotation, and torque detection of quartz microparticles.

by: A La Porta, MD Wang

Phys Rev Lett, Vol. 92, No. 19. (14 May 2004)

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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.

@article{citeulike:1888750, 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.}, address = {Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA.}, author = {La Porta, A. and Wang, M. D. }, citeulike-article-id = {1888750}, issn = {0031-9007}, journal = {Phys Rev Lett}, keywords = {microparticles, optical, rotational, torque, trap, tweezers}, month = {May}, number = {19}, posted-at = {2008-01-02 08:11:23}, priority = {2}, title = {Optical torque wrench: angular trapping, rotation, and torque detection of quartz microparticles.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/15169392}, volume = {92}, year = {2004} }

RIS record

TY - JOUR ID - citeulike:1888750 L3 - citeulike-article-id:1888750 TI - Optical torque wrench: angular trapping, rotation, and torque detection of quartz microparticles. JF - Phys Rev Lett VL - 92 IS - 19 AD - Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, New York 14853, USA. SN - 0031-9007 N2 - 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. KW - microparticles KW - optical KW - rotational KW - torque KW - trap KW - tweezers AU - La Porta, A AU - Wang, MD PY - 2004/05/14/ UR - http://view.ncbi.nlm.nih.gov/pubmed/15169392 ER -

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