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Friday, October 12, 2012

Measuring the pressures across microfluidic droplets with an optical tweezer

Yuhang Jin, Antony Orth, Ethan Schonbrun, and Kenneth B. Crozier

We introduce a novel technique that enables pressure measurements to be made in microfluidic chips using optical trapping. Pressure differentials across droplets in a microfluidic channel are determined by monitoring the displacements of a bead in an optical trap. We provide physical interpretation of the results. Our experiments reveal that our device has high sensitivity and can be operated over a wide range of pressures from several Pascals to several thousand Pascals.

DOI

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