Journal
ANALYTICAL CHEMISTRY
Volume 83, Issue 23, Pages 8855-8858Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac2024365
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Funding
- UK Engineering and Physical Sciences Research Council (EPSRC)
- Australian Research Council
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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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