Dr. Michael Cho Profile

Dr. Michael Cho

at Univ of Texas at Arlington

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Proceedings Article | 5 October 2023 Presentation + Paper

Exploring nanodynamics with optical and dielectrophoretic trapping

Vatsal Joshi, Negar Danesh, Hyejin Moon, Michael Cho, Alan Bowling

Proceedings Volume 12649, 126490J (2023) https://doi.org/10.1117/12.2677485

KEYWORDS: Particles, Dielectrophoresis, Optical tweezers, Electrodes, Objectives, Cameras, Microfluidics, Image visualization

Read Abstract +

It has been observed that a nanoparticle can exhibit underdamped motion while moving toward the focal point of an optical trap. It is unclear whether this motion is caused by laser or fluid forces. Dielectrophoretic forces can trap nanoparticles as an alternate approach to optical trapping. The electrical trap uses no laser, so we can determine which force causes the underdamped motion. A microchannel with a quad-electrode arrangement on its ceiling and floor was designed to explore this question. Supplying an oscillating voltage to these electrodes generates an oscillating electric field resulting in the dielectrophoretic force that traps the particle. However, matching common characteristics, such as trap stiffness, is difficult between the two methods. This paper compares the two approaches for a 2 μm diameter particle. Instead of matching the trapping characteristics, the next step in this work is to use the dielectrophoretic device to explore the effect of the particle’s momentum on its motion, which can explain the underdamped motion. Combining optical and dielectrophoretic trapping will offer new insights into the dynamic behavior of small particles in a fluid medium.

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