Abstract
Liquid microlenses are widely used due to their unique advantages such as no mechanical moving, tunable focal length, and relevance in optical systems for imaging, concentrating, and biosensing. In this work, we demonstrate development of liquid lenses of two immiscible liquids based on electrowetting on dielectric (EWOD) material. A droplet of electrolytic KCl buffer solution acts a conducting liquid confined in an immiscible insulating oil can work as the liquid lens. The applied electric field seems to control the shape of the conducting droplet –oil interface curvature, altering the focal length. Accordingly, the variations as regards contact angle (CA), droplet height, focal length, etc. have been analyzed for two insulating oil media namely, silicone oil and Johnson’s mineral oil. While CA versus applied voltage trends offered distinct curves for two different kinds of oil, contact angle saturation (CAS) was seen to occur at a CA value, θv=120o.
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