Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3039070
Keywords
amorphous semiconductors; contact angle; dielectric thin films; drops; electrodes; elemental semiconductors; optical modulation; photoconductivity; silicon; wetting
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Funding
- NSF [ECCS-0747950]
- Institute for Cell Mimetic Space Exploration (CMISE) through NASA URETI
- Directorate For Engineering [0747950] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [0747950] Funding Source: National Science Foundation
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We report on a continuous optoelectrowetting mechanism enabling continuous high spatial resolution optical modulation of electrowetting effect on a featureless planar photoconductive amorphous silicon surface. Dynamically patterned virtual electrode switches voltage between the amorphous silicon layer and the dielectric layer for contact angle modulation. This device is particularly attractive for manipulating picoliter droplets. We have experimentally demonstrated trapping and moving of 10 and 50 pl droplets at a speed of 1 mm/s using a light beam.
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