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This paper describes a simple method for fabricating a variable-focus lens byusing PDMS (polydimethylsiloxane) and filling with liquid for thevariable-focus lens. The lens diameter of 2-mm was designed in this experimentand expected to reach the focal length in the range of 3 ~ 12 mm. Thetheoretical value between the liquid volume and the lens contact angle atdifferent focal lengths were simulated and measured. The pumped-in volumesranged from 200 to 1400 $\mu$l, the contact angles ranged from 14.25 degrees to49.02 degrees. Changing the deformation of PDMS film using differentmicro-fluidic volume produces the variable focal length from 4 10 mm in thisexperiment. The proposed method successfully fabricated a variable-focus lens.Bonding PDMS only once using no expensive instrument such as oxygen plasma wasaccomplished. The final objective is to insert the variable focus lens intoportable optical imagery products.

Fabrication of Miniaturized Variable-focus Lens Using Liquid Filling Technique