Patent ID: 6185473
Filing Date: 2001-02-06
Classification: G03F

Abstract:
An optical pattern transfer tool, comprising:a transparent layer having first and second planar surfaces lying in substantially parallel planes, first and second steps formed between the first and second planar surfaces at first and second edges, respectively, defining a width of the first planar surface such that illuminated light transmitted on either side of the steps is 180.+-.10 degrees out of phase; anda plurality of opaque regions overlying the first planar surface, each of the opaque regions spaced from one another and offset from one another such that the opaque regions are alternately aligned along a length of the first planar surface, such that one of the opaque regions is aligned with a portion of the first edge and the next one of the opaque regions along the length is aligned with a portion of the second edge,wherein a first wordline is optically defined by the first edge and the opaque regions aligned with the first edge, and a second wordline is optically defined by the second edge and the opaque regions aligned with the second edge.