Abstract:
Eine Beleuchtungsintensitäts-Korrekturvorrichtung (24) dient zur Vorgabe einer Beleuchtungsintensität über ein Beleuchtungsfeld (18) einer lithografischen Projektionsbelichtungsanlage. Die Korrekturvorrichtung (24) hat eine Mehrzahl von nebeneinander angeordneten, stabförmigen Einzelblenden (27). Ein Verlagerungsantrieb dient zur Verlagerung mindestens einiger der Einzelblenden (27) zumindest längs ihrer jeweiligen Stabachse (28). Freie Enden der Einzelblenden (27) sind mit Hilfe des Verlagerungsantriebes (29) individuell zur Vorgabe einer längs einer Korrekturdimension (x) quer zu den Stabachsen (28) wirkenden Intensitätskorrektur einer Beleuchtung des Beleuchtungsfeldes (18) in eine vorgegebene Verlagerungsposition verlagerbar. Die Einzelblenden (27) gehören zu mindestens drei Abstands-Blendengruppen (I bis IV) und haben jeweils einen anderen Abstand (a I bis a IV ) zu einer Blenden-Referenzebene (16). Letztere ist aufgespannt von einer Stab-Referenzachse (y) parallel zu den Stabachsen (28) und einer Korrektur-Referenzachse (x) längs der Korrekturdimension und gibt eine Anordnungsebene für das Beleuchtungsfeld (18) vor. Es resultiert eine Korrekturvorrichtung mit verbesserter Korrekturgenauigkeit.
Abstract:
A delivery system for use within a lithographic system. The beam delivery system comprises optical elements arranged to receive a radiation beam from a radiation source and to reflect portions of radiation along one or more directions to form a one or more branch radiation beams for provision to one or more tools.
Abstract:
An actuator (300) to displace, for example a mirror, provides movement with at least two degrees of freedom by varying the currents in two electromagnets (370, 372, 376, 378). A moving part includes a permanent magnet (362) with a magnetic face constrained to move over a working area lying substantially in a first plane perpendicular to a direction of magnetization of the magnet. The electromagnets have pole faces (380, 382) lying substantially in a second plane closely parallel to the first plane, each pole face substantially filling a quadrant of the area traversed by the face of the moving magnet. An optical position sensor (390) may direct a beam of radiation (398) at the moving magnet through a central space between the electromagnets. The sizes of facets in a pupil mirror device may be made smaller in a peripheral region, but larger in a central region, thereby relaxing focusing requirements.
Abstract:
A delivery system for use within a lithographic system. The beam delivery system comprises optical elements arranged to receive a radiation beam from a radiation source and to reflect portions of radiation along one or more directions to form a one or more branch radiation beams for provision to one or more tools.
Abstract:
An actuator to displace, for example a mirror, provides movement with at least two degrees of freedom by varying the currents in two electromagnets. A moving part includes a permanent magnet with a magnetic face constrained to move over a working area lying substantially in a first plane perpendicular to a direction of magnetization of the magnet. The electromagnets have pole faces lying substantially in a second plane closely parallel to the first plane, each pole face substantially filling a quadrant of the area traversed by the face of the moving magnet. An optical position sensor may direct a beam of radiation at the moving magnet through a central space between the electromagnets. The sizes of facets in a pupil mirror device may be made smaller in a peripheral region, but larger in a central region, thereby relaxing focusing requirements.