Patent ID: 7247868
Filing Date: 2007-07-24
Classification: G03F

Abstract:
1. An exposure method for projecting extreme ultraviolet light reflected from a pattern formed on a reflective reticle onto a substrate via a projection optical system, said method comprising: a detection step of detecting a relative position, to a first mark formed on a stage configured to hold the reflective reticle, of a second mark formed on the reflective reticle, said detection step comprising sub-steps of: (i) detecting, with a detector, first light reflected from the first mark on the stage, the stage being at a first position; (ii) detecting, with the detector, second light reflected from the second mark on the reflective reticle held by the stage, the stage being at a second position different from the first position; and (iii) detecting a relative position of the second mark to the first mark based on the detected first light, the detected second light, the first position, and the second position.