Adaptive beam tracking and steering via electrowetting-controlled liquid prism

Jiangtao Cheng*, Chung-Lung Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Scopus citations


We report an electrowetting-controlled optofluidic system for adaptive beam tracking and agile steering. With two immiscible fluids in a transparent cell, we can actively control the contact angle along the fluid-fluid-solid tri-junction line and hence the orientation of the fluid-fluid interface via electrowetting. The naturally formed meniscus between the two liquids can function as an optical prism. We have fabricated a liquid prism module with an aperture size of 10 mm × 10mm. With 1 wt. %KCl and 1 wt.% Sodium Dodecyl Sulfate added into deionized water, the orientation of the water-silicone oil interface has been modulated between -26° and 26° that can deflect and steer beam within the incidence angle of 0°-15°. The wide-range beam tracking and steering enables the liquid prism work as an electrowetting solar cell.

Original languageEnglish
Article number191108
JournalApplied Physics Letters
Issue number19
StatePublished - 7 Nov 2011

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