Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 114, Issue 42, Pages 11087-11091Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1714953114
Keywords
optical forces; colloids; microparticles; evanescent field; elliptical motion
Categories
Funding
- NSF GFRP [DGE1144152]
- Research Foundation Flanders [12O9115N]
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We examine the motion of periodically driven and optically tweezed microspheres in fluid and find a rich variety of dynamic regimes. We demonstrate, in experiment and in theory, that mean particle motion in 2D is rarely parallel to the direction of the applied force and can even exhibit elliptical orbits with non-zero orbital angular momentum. The behavior is unique in that it depends neither on the nature of the microparticles nor that of the excitation; rather, angular momentum is introduced by the particle's interaction with the anisotropic fluid and optical trap environment. Overall, we find this motion to be highly tunable and predictable.
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