Patent ID: 8497997

Claim:
A semiconductor device comprising an alignment mark, wherein a detection beam is scanned on said alignment mark so as to detect a position coordinate of said alignment mark, wherein said alignment mark comprises a plurality of first bar marks, which are arranged in a first predetermined interval along a first direction of scanning said detection beam, wherein each of said plurality of first bar marks comprises a plurality of first interconnection marks, which are arranged along a second direction orthogonal to said first direction, wherein a first space between two adjacent first interconnection marks is shorter than a wavelength of said detection beam within a range of a design constraint, and wherein said alignment mark further comprises a plurality of second bar marks, which are arranged in a second predetermined interval along the second direction, wherein each of said plurality of second bar marks comprises a plurality of second interconnection marks, which are arranged along the first direction, and wherein a second space between two adjacent second interconnection marks is shorter than the wavelength of said detection beam within the range of the design constraint.