An optical system consisting of an aqueous electrolyte resting on a polymer/gold/indium-tin-oxide (ITO) layer
deposited onto a glass substrate is analyzed to acquire contact angle - focal distance data as a function of applied
voltage. The shape factor of a liquid lens and its dependence on the perimeter of contact line and contact angle was
analyzed in the presence of an electrical field applied between the electrolyte and planar electrode system. The contact
angle of a liquid on a thin, transparent film of gold (20 nm thick) - on ITO under electrolyte solution could be varied
from 110 ± 3° when the gold was held at -2.4 V to 41 ± 3° without voltage. The behavior of a water-based electrolyte
and water-soluble polymer blend and its influence on the shape of contact line and profile of the lens were investigated
by employing a holographic setup at wavelengths of 632.8 and 543.5 nm. Optical micrographs showing the profile of the
lens, aberration-less aperture, deformation of contact line, and shape of the liquid lens, respectively, were analyzed in
reflection and transmission. Both the advancing and receding contact angles were measured directly from digitized
images of the profile of the lens. The dynamic range of linear beam steering and dependence of the focal length of the
liquid lens on the applied voltage are discussed.
Eclipse SteerTechTM transmissive fluid state electrowetting technology has successfully demonstrated the ability to
control the shape and position of a fluid lenslet. In its final form, the technology will incorporate a dual fluid lenslet
approach capable of operating in extremely high acceleration environments. The beam steering system works on the
principle of electro-wetting. A substrate is covered with a closely spaced array of, independently addressable,
transparent, electrically conductive pixels utilizing Eclipse's proprietary EclipseTECTM technology. By activating
and deactivating selected EclipseTECTM pixels in the proper sequence, the shape and position of fluid lenslets or
arrays of lenslets can be dynamically changed at will. The position and shape of individual fluid lenslets may be
accurately controlled on any flat, simply curved, or complex curved, transparent or reflective surface. The smaller
the pixels the better control of the position and shape of the fluid lenslets. Information on the successful testing of
the Eclipse SteerTechTM lenslet and discussion of its use in a de-centered lenslet array will be presented.
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