Abstract
High-quality products come from high-quality instrument. We present here an optimized instrument for electrochemical micromachining, in which a granite bridge base, a macro–micro dual driven positioning stage and a force-displacement sensing module are combined to promote dramatically the tool–workpiece alignment, in-situ monitoring and product quality. As a testing experiment, a polymethylmethacrylate (PMMA) microlens array with a diameter of 110μm and a height of 3.5μm has been transferred successfully onto the surface of an n-GaAs wafer by the confined etchant layer technique (CELT). The machining tolerance is about 3.4nm and the surface roughness is lower than 8.0nm. Moreover, the presented techniques have significance in the precise electrochemical instruments for not only micromachining but also scanning electrochemical probe techniques.
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