Abstract
A tunable-focus liquid lens using dielectrophoretic effect is demonstrated. When a voltage is applied to a dielectric liquid droplet, the generated electric field inside the droplet is inhomogeneous. As a result, the liquid bears a dielectric force and its surface profile can be reshaped which causes the focal length to change. Adaptive lenses with different apertures are fabricated and their performances evaluated. In comparison to the patterned-electrode liquid lenses, our lens uses continuous electrode which is much simpler for fabrication.
Highlights
Lens is an important optical element for image processing, optical communication, machine vision, and camera applications
In such a zoom lens system, the effective focal length is variable by mechanically adjusting the distance between the lenses along the optical axis
We find that when a voltage is applied to a dielectric liquid droplet the generated electric field inside the droplet is inhomogeneous
Summary
Lens is an important optical element for image processing, optical communication, machine vision, and camera applications. Different from an elastic membrane lens whose shape change is manipulated mechanically [7,8,9,10], both electro-wetting lens [11,12,13] and dielectric lens [14,15] use an external voltage to tune the focal length. These two types of lenses have similar features, e.g., there are two immiscible liquids in the lens cell; one liquid forms a droplet on one inner substrate surface and the other liquid fills the surrounding space of the droplet. We have fabricated several dielectric lenses with different apertures and evaluated their performances
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