Precise and simple optical alignment method for double-sided lithography

Autor: Gruber, Matthias, Hagedorn, Detlev, Eckert, Werner
Zdroj: Applied Optics; October 2001, Vol. 40 Issue: 28 p5052-5055, 4p
Abstrakt: A method for aligning a photolithographic mask at the top of a transparent wafer that has a pattern on its bottom side is presented. The method is based on optical self-imaging of special alignment marks and provides submicrometer accuracy. The method is simple and robust and can conveniently be implemented on laboratory mask aligners for contact or proximity printing.
Databáze: Supplemental Index