Lithographic apparatus and device manufacturing method
First Claim
1. A lithographic apparatus, comprising:
- an illumination system that supplies a beam of radiation;
an array of individually controllable elements that pattern the beam; and
a projection system that projects the patterned beam onto a target portion of a substrate, the projection system defining a pupil and comprising an array of lenses,wherein the array of lenses is arranged to direct a respective part of the patterned beam towards a respective part of the target portion of the substrate,wherein the individually controllable elements are selectively controllable to progressively direct a respective part of the patterned beam away from the pupil, such that a amount of the patterned beam passing through the pupil is progressively varied,wherein the individually controllable elements are arranged in groups, such that the patterned beam is directed by each element in each group towards a same lens in the lens array, andwherein the individually controllable elements in each group are controlled together to direct the patterned beam in different directions away from the pupil, such that a pattern imparted onto the beam by that group of individually controllable elements is substantially symmetrical with respect to the pupil.
1 Assignment
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Accused Products
Abstract
A lithographic apparatus and method include an illumination system that supplies a beam of radiation, an array of individually controllable elements that pattern the beam, and a projection system that directs the patterned beam a substrate supported on a substrate table. The projection system defines a pupil. Either the pupil or the array of individually controllable elements is imaged onto a target portion of the substrate. The projection system includes an array of lenses with each lens in the array arranged to direct a respective part of the patterned beam onto a respective part of the target portion of the substrate. In one example, each of the individually controllable elements is selectively controllable to direct a respective part of the beam away from the pupil such that the proportion of the bean passing through the pupil is adjusted. In one example, the individually controllable elements are arranged in groups, such that radiation deflected by each element in one group is directed towards the same lens in the lens array. In one example, the individually controllable elements in any one group are controlled together to direct radiation in different directions away from the pupil, such that the pattern imparted to the beam by that group of elements is substantially symmetrical with respect to the pupil.
22 Citations
17 Claims
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1. A lithographic apparatus, comprising:
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an illumination system that supplies a beam of radiation; an array of individually controllable elements that pattern the beam; and a projection system that projects the patterned beam onto a target portion of a substrate, the projection system defining a pupil and comprising an array of lenses, wherein the array of lenses is arranged to direct a respective part of the patterned beam towards a respective part of the target portion of the substrate, wherein the individually controllable elements are selectively controllable to progressively direct a respective part of the patterned beam away from the pupil, such that a amount of the patterned beam passing through the pupil is progressively varied, wherein the individually controllable elements are arranged in groups, such that the patterned beam is directed by each element in each group towards a same lens in the lens array, and wherein the individually controllable elements in each group are controlled together to direct the patterned beam in different directions away from the pupil, such that a pattern imparted onto the beam by that group of individually controllable elements is substantially symmetrical with respect to the pupil. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device manufacturing method, comprising:
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patterning a beam using an array of individually controllable elements; projecting the patterned beam onto a target portion of a substrate using an array of lenses in a projection system, wherein the lens in the array of lenses is arranged to direct a respective part of the patterned beam towards a respective part of the target portion; selectively controlling the individually controllable elements to progressively direct a respective part of the patterned beam away from a pupil in the projection system, such that an amount of the patterned beam passing through the pupil is progressively varied; and controlling the individually controllable elements in groups, wherein the individually controllable elements in each group direct the patterned beam towards a same lens in the array of lenses, wherein the individually controllable elements in each group progressively direct radiation away from the pupil in different directions, such that the pattern imparted to the beam by each of the groups is substantially symmetrical with respect to the pupil. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A lithographic apparatus, comprising:
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an illumination system that supplies a beam of radiation; an array of individually controllable elements that pattern the beam; and a projection system that projects the patterned beam onto a target portion of a substrate, the projection system defining a pupil and comprising an array of lenses, which are arranged to direct a respective part of the patterned beam towards a respective part of the target portion, wherein the individually controllable elements are arranged in groups, such that the patterned beam is directed by each element in each respective group towards a same respective lens in the lens array, and wherein each of the individually controllable elements is selectively controllable to direct a respective part of the patterned beam away from the pupil, such that an amount of the patterned beam passing through the pupil is varied.
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16. A device manufacturing method, comprising:
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patterning a beam using an array of individually controllable elements; projecting the patterned beam onto a target portion of a substrate using an array of lenses in a projection system, wherein lenses in the array of lenses are arranged to direct a respective part of the patterned beam towards a respective part of the target portion; and controlling the individually controllable elements in groups, wherein the individually controllable elements in the groups direct the patterned beam towards a same lens in the array of lenses, wherein the individually controllable elements in the groups direct radiation away from a pupil of the projection system in different directions, such that the pattern imparted to the beam by the groups is substantially symmetrical with respect to the pupil.
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17. A lithographic apparatus, comprising:
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an illumination system that supplies a beam of radiation; an array of individually controllable elements that pattern the beam; and a projection system that projects the patterned beam onto a target portion of a substrate, the projection system defining a pupil and comprising an array of lenses, wherein the individually controllable elements are arranged in groups, such that the patterned beam is directed by each element in each group towards a same lens in the lens array, and wherein the individually controllable elements in each group are controlled together to direct the patterned beam in different directions away from the pupil, such that a pattern imparted onto the beam by that group of individually controllable elements is substantially symmetrical with respect to the pupil.
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Specification