Patent ID: 8111379
Filing Date: 2012-02-07
Classification: B82Y,G01B,G03B,G03F,H01J

Abstract:
1. A method of facilitating operation of a lithography system, the method comprising: directing a detection beam of light onto a substrate surface, the substrate surface being positioned within the lithography system for patterning thereof, and the detection beam of light reflecting off the substrate surface as a reflected beam, and the detection beam of light being distinct from a writing beam of the lithography system; optically splitting the reflected beam into at least a first reflected beam portion and a second reflected beam portion; impinging the first reflected beam portion onto a first detector plane of a first optical detector to generate intensity and position data therefrom, and impinging the second reflected beam portion onto a second detector plane of a second optical detector to generate intensity and position data therefrom; and utilizing the intensity and position data generated from the first reflected beam portion and the intensity and position data generated from the second reflected beam portion in determining height and tilt of the substrate surface relative to a nominal writing plane of the lithography system.