Abstract
A technique which allows the use of projection photolithography with the photoresist liftoff process, for fabrication of Submicrometer metal patterns, is described. Through-the-substrate (back-projection) exposure of the photoresist produces the undercut profiles necessary for liftoff processing. Metal lines and superconducting microbridges of 0.2-µm width have been fabricated with this technique. Experimental details and process limits are discussed.

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