2014
DOI: 10.1109/jphot.2014.2332559
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A Moiré-Based Four-Channel Focusing and Leveling Scheme for Projection Lithography

Abstract: Focusing and leveling are two imperative processes to adjust the wafer onto the ideal focal plane of projection lithography tools. Based on moiré fringes formed by particularly designed dual-grating marks, the four-channel focusing and leveling scheme is proposed and demonstrated. These relationships between the tilted amount of wafer, the vertical defocusing amount, and the phase distributions of moiré fringes are deduced. A single-channel experimental setup is constructed to verify the performances of propos… Show more

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Cited by 3 publications
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