Electrowetting-on-Dielectric Actuation of a Vertical Translation and Angular Manipulation Stage
Author(s)Wang, Evelyn; Preston, Daniel John; Anders, Ariel S; Barabadi, Banafsheh; Tio, Evelyn; Zhu, Yangying; Dai, DingRan; ... Show more Show less
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Adhesion and friction during physical contact of solid components in microelectromechanical systems (MEMS) often lead to device failure. Translational stages that are fabricated with traditional silicon MEMS typically face these tribological concerns. This work addresses these concerns by developing a MEMS vertical translation, or focusing, stage that uses electrowetting-on-dielectric (EWOD) as the actuating mechanism. EWOD has the potential to eliminate solid-solid contact by actuating through deformation of liquid droplets placed between the stage and base to achieve stage displacement. Our EWOD stage is capable of linear spatial manipulation with resolution of 10 μm over a maximum range of 130 μm and angular deflection of approximately ±1°, comparable to piezoelectric actuators. We also developed a model that suggests a higher intrinsic contact angle on the EWOD surface can further improve the translational range, which was validated experimentally by comparing different surface coatings. The capability to operate the stage without solid-solid contact offers potential improvements for applications in micro-optics, actuators, and other MEMS devices.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Mechanical Engineering
Applied Physics Letters
American Institute of Physics (AIP)
Preston, Daniel J. et al. “Electrowetting-on-Dielectric Actuation of a Vertical Translation and Angular Manipulation Stage.” Applied Physics Letters 109.24 (2016): 244102.
Author's final manuscript