Patent ID: 7678512
Filing Date: 2010-03-16
Classification: G03F

Abstract:
1. A method of fabricating a grayscale reticle, comprising: preparing a quartz wafer substrate; depositing a layer of SRO on the top surface of the quartz substrate; patterning and etching the SRO to form an initial microlens pattern using step-over lithography; patterning and etching the SRO to form a recessed pattern in the SRO; depositing an opaque film on the SRO; patterning and etching the opaque film; depositing and planarizing a planarizing layer, wherein the combination of the SRO and planarizing layer form a filmstack with a constant thickness; cutting the quartz wafer into rectangular pieces sized to be smaller than a selected blank reticle; bonding the pieces to selected reticle blanks to form a grayscale reticle.