Patent ID: 8081294
Filing Date: 2011-12-20
Classification: G03F

Abstract:
1. A method of evaluating an optical beam source of an exposure device used in an exposure process in manufacturing a semiconductor device, the method comprising: dividing the optical beam source into a plurality of unit optical beam sources in a unit size determined by the exposure device; turning on and off, each one time, the plurality of unit optical beam sources, one by one, in an optical beam source region usable for illumination of the optical beam source; acquiring a difference between a first evaluation of a target pattern determined when one of the plurality of unit optical beam sources is turned on and a second evaluation of the target pattern determined when the one of the plurality of unit optical beam sources is turned off; and plotting the difference for each of the plurality of unit optical beam sources on a position corresponding to each of the plurality of unit optical beam sources to form a difference map.