Picoliter rheology of gaseous media using a rotating optically trapped birefringent microparticle

Yoshihiko Arita; Andrew W. McKinley; Michael Mazilu; Halina Rubinsztein-Dunlop; Kishan Dholakia

doi:10.1021/ac2024365

Picoliter rheology of gaseous media using a rotating optically trapped birefringent microparticle

Yoshihiko Arita, Andrew W. McKinley, Michael Mazilu, Halina Rubinsztein-Dunlop, Kishan Dholakia

Department of Physics

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

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.

Original language	English
Pages (from-to)	8855-8858
Number of pages	4
Journal	Analytical Chemistry
Volume	83
Issue number	23
DOIs	https://doi.org/10.1021/ac2024365
Publication status	Published - 2011 Dec 1

All Science Journal Classification (ASJC) codes

Analytical Chemistry

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10.1021/ac2024365

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AU - Dholakia, Kishan

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AB - 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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