Patent ID: 8665416
Filing Date: 2014-03-04
Classification: G03F

Abstract:
1. An exposure apparatus which exposes a substrate to a pattern of an original, the apparatus comprising: an original stage which supports the original; a substrate stage which supports the substrate; a projection optical system which projects the pattern of the original onto the substrate; and a measurement system which measures an aberration of the projection optical system, the measurement system including a first pattern for aberration measurement, which is formed on a first mask supported by the original stage, a second pattern for aberration measurement, which is formed on a second mask supported by the substrate stage, a third pattern formed on the first mask to align the first pattern and the second pattern, the third pattern positioned at a position spaced apart from the first pattern by a first predetermined distance, a fourth pattern formed on the second mask to align the first pattern and the second pattern, the fourth pattern positioned at a position spaced apart from the second pattern by a second predetermined distance, a detection system which illuminates the third pattern and the fourth pattern and simultaneously detects light from the third pattern and light from the fourth pattern for obtaining information about relative positions between the third pattern and the fourth pattern in an optical axis direction of the projection optical system and a direction perpendicular to the optical axis, and a controller which controls at least one of the original stage and the substrate stage to align the third pattern and the fourth pattern in the optical axis direction and the direction perpendicular to the optical axis based on information about the relative positions between the third pattern and the fourth pattern detected by the detection system, and controls the original stage and the substrate stage to align the first pattern and the second pattern in the optical axis direction and the direction perpendicular to the optical axis based on information of the relative position between first pattern and the third pattern and the relative position between the second pattern and the fourth pattern after the third pattern and the fourth pattern are aligned, wherein the measurement system measures the aberration of the projection optical system using the first pattern and the second pattern after the first pattern and the second pattern are aligned by controlling the original stage and the substrate stage.