Title |
Picoliter Rheology of Gaseous Media Using a Rotating Optically Trapped Birefringent Microparticle
|
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Published in |
Analytical Chemistry, November 2011
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DOI | 10.1021/ac2024365 |
Pubmed ID | |
Authors |
Yoshihiko Arita, Andrew W. McKinley, Michael Mazilu, Halina Rubinsztein-Dunlop, Kishan Dholakia |
Abstract |
An optically trapped birefringent microparticle is rotated by a circularly polarized beam in a confined gaseous medium. By recording the terminal rotation velocity and the change in polarization of the incident trapping beam, we determine the viscosity by probing a picoliter volume of air, carbon dioxide, and argon in the vicinity of the microparticle. We also characterize the optical force acting on a trapped particle in air using the generalized Lorenz-Mie theory taking into account the aberrations present. This opens up a new potential application of optical tweezers for the accurate measurement of gas viscosity in confined geometries. |
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