Exposure apparatus and device fabrication method
An exposure apparatus comprising an illumination optical system configured to illuminate a reticle with a light beam from a light source, and a projection optical system configured to project a pattern image of the reticle onto a substrate, the illumination optical system including a light-shielding member which is arranged near a plane conjugate to a pupil plane of the projection optical system and which can move along an optical axis of the illumination optical system, wherein the light-shielding member is moved such that a light intensity distribution on the pupil plane of the projection optical system becomes nonuniform.
1. An exposure apparatus comprising:
an illumination optical system configured to illuminate a reticle with a light beam from a light source; and
a projection optical system configured to project a pattern image of the reticle onto a substrate;
said illumination optical system including a light-shielding member which is arranged near a plane conjugate to a pupil plane of said projection optical system and which can move along an optical axis of said illumination optical system,
wherein said light-shielding member is moved such that a light intensity distribution on the pupil plane of said projection optical system becomes nonuniform.
2. The apparatus according to claim 1 , wherein the movement of said light-shielding member changes a light intensity in a radius direction from a position of an optical axis of said projection optical system among the light intensity distribution.
3. The apparatus according to claim 1 , wherein said light-shielding member is one light-shielding plate.
4. The apparatus according to claim 1 , wherein said light-shielding member is moved to maintain a coherency constant.
5. An exposure apparatus comprising:
an illumination optical system configured to illuminate a reticle with a light beam from a light source; and
a projection optical system configured to project a pattern image of the reticle onto a substrate;
said illumination optical system including a light-shielding member which is arranged near a plane conjugate to a pupil plane of said projection optical system and which can move along an optical axis of said illumination optical system,
wherein said light-shielding member includes
a transmission substrate configured to transmit the light beam, and
a shielding unit which is formed on said transmission substrate and configured to shield the light beam, said shielding unit being on the optical axis of said illumination optical system.
6. The apparatus according to claim 5 , wherein the movement of said light-shielding member changes a light intensity in a radius direction from a position of an optical axis of said projection optical system among the light intensity distribution.
7. The apparatus according to claim 5 , wherein said light-shielding member is moved to maintain a coherency constant.
8. A device fabrication method comprising steps of:
exposing a substrate using an exposure apparatus according to claim 1 ; and
performing a development process for the substrate exposed.
9. A device fabrication method comprising steps of:
exposing a substrate using an exposure apparatus according to claim 5 ; and
performing a development process for the substrate exposed.