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A new method for electrode deposition using a SU-8 shadow mask in a 3D electro-wetting lenticular lens chamber structure

There are various methods of patterning electrodes in a MEMS process. However, it is difficult to pattern electrodes in a 3-dimensional structure. One way to overcome these drawbacks is to use a shadow mask. This approach allows electrodes to be deposited on selected areas even if the substrate is not flat. In this paper, a SU-8 shadow mask that is inexpensive and easy to fabricate is proposed. Another advantage of the SU-8 shadow mask is reusability. Most importantly, it is possible to deposit a microscale electrode on 3-dimensional structure with the SU-8 shadow mask. Here, the electrode was deposited on the chamber of an electro-wetting lenticular lens. The chamber structure of the electrowetting lenticular lens has a long reversed trapezoidal shape. In order to adjust the optical axis in the electro-wetting lenticular lens, electrodes should be deposited on each sidewall of the chamber. It was verified that the electrodes were successfully separated with use of the SU-8 shadow mask and the width of the electrode was 50μm.