Escape from an Optoelectronic Tweezer Trap: Experimental Results and Simulations
Posted on 2018-02-21 - 18:24
Optoelectronic Tweezers (OET) is a microsystem actuation technology capable of moving microparticles at mm s-1 velocities with nN forces. In this work, we analyze the behavior of particles manipulated by negative dielectrophoresis (DEP) forces in an OET trap. A user-friendly computer interface was developed to generate a circular rotating light pattern to control the movement of the particles, allowing their force profiles to be conveniently measured. Three-dimensional simulations were carried out to clarify the experimental results, and the DEP forces acting on the particles were simulated by integrating the Maxwell stress tensor. The simulations matched the experimental results and enabled the determination of a new “hopping” mechanism for particle-escape from the trap. As indicated by the simulations, there exists a vertical DEP force at the edge of the light pattern that pushes up particles to a region with smaller horizontal DEP force. We propose that this phenomenon will be important to consider for the design of OET micromanipulation experiments for a wide range of applications.
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Zhang, Shuailong; Nikitina, Adele; Chen, Yujie; Zhang, Yanfeng; Liu, Lin; Flood, Andrew; et al. (2018). Escape from an Optoelectronic Tweezer Trap: Experimental Results and Simulations. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.3912676.v1
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AUTHORS (10)
SZ
Shuailong Zhang
AN
Adele Nikitina
YC
Yujie Chen
YZ
Yanfeng Zhang
LL
Lin Liu
AF
Andrew Flood
JJ
Joan Juvert
DC
Dean Chamberlain
NK
Nazir Kherani
SN
Steven Neale