Electrowetting, a technology pursued seriously thus far by only a handful of companies worldwide, seeks to blend fluids and electricity to shape liquid into the form of an optical lens. This approach, which can produce a lens for observation, filtering light, switching optical signals, or focusing a laser, is of interest to military-systems designers because it can be very small, has no moving parts, is inherently rugged, and uses electrical power in very low amounts. Electrowetting lenses also improve solar efficiency.
In addition to the application for solar tracking, electrowetting may also be the technology that brings color to low-energy e-book readers. Small autofocus lenses, such as those used for cell phone cameras, also use electrowetting principles in the same way to control small lenses that are actually liquids.
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