Variable thickness electroplating

A pioneering approach to making small 3D structures is summarized by Angus and Landau [31]. The approach [32] involves electroplating, with variable thickness images enabled by exposing a photo-sensitized gel through a gray-scale mask, which serves to cross-link the gelatin in proportion to the exposure [31]. The resistance to ionic transport through the gelatin increases with the cross-linking. "Therefore, on electroplating through the gelatin, the gray scale of the original optical mask is translated into thickness variations on the final surface; that is, darker areas on the optical mask lead to thicker electrodeposits. The method provides a convenient additive method for generating 3D surface relief".

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