In this paper, we introduce an electrode design for electrohydrodynamically actuated liquid microlenses. The effective electrode areal density radially increases which results in centering of the liquid tunable microlens with a planar device structure. A model was developed to demonstrate the centering mechanism of the liquid microlens. 3D electrostatic simulation was conducted and validity of the idea was examined. A simple fabrication process was developed that uses a surface modified SU-8 as the insulator. The focal length of the microlens was measured to vary from 10.1 mm to 5.8 mm as the voltage varied from zero to 100V.

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