Optical exposure systems for three-dimensional fabrication of microprobe

New optical exposure systems for patterning on nonplanar surfaces were developed. One of them is the photoresist exposure system; the other is the Parylene laser ablation system with KrF excimer laser. Microprobe multielectrodes for recording neuron impulses were fabricated with the photoresist exposure system. However, this method has the disadvantage that it is difficult to coat a nonplanar surface with photoresist uniformly. It is demonstrated that Parylene can be coated uniformly on a nonplanar surface and be patterned by a Parylene laser ablation system. A Cr line with a 10 mu m width on a glass plate was patterned by Parylene laser ablation and the subsequent lift-off technique. This process is useful for patterning thin film on nonplanar surfaces.<>