Illumination system, lithographic apparatus and method
First Claim
1. An illumination system comprising an array of controllable mirrors configured to direct radiation towards a pupil plane and an array of lenses configured to direct radiation sub-beams towards the array of controllable mirrors,wherein a first lens of the array of lenses and a controllable mirror of the array of controllable mirrors forms a first optical channel having a first optical power and a second lens of the array of lenses and a controllable mirror of the array of controllable mirrors forms a second optical channel having a second optical power, andwherein the first optical power is different from the second optical power.
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Accused Products
Abstract
An illumination system comprising an array of controllable mirrors configured to direct radiation towards a pupil plane and an array of lenses configured to direct radiation sub-beams towards the array of controllable mirrors, wherein a first lens of the array of lenses and a controllable mirror of the array of controllable mirrors forms a first optical channel having a first optical power and a second lens of the array of lenses and a controllable mirror of the array of controllable mirrors forms a second optical channel having a second optical power, such that a radiation sub-beam formed by the first optical channel has a first cross-sectional area and shape at the pupil plane and a radiation sub-beam formed by the second optical channel has a second different cross-sectional area and/or shape at the pupil plane.
31 Citations
28 Claims
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1. An illumination system comprising an array of controllable mirrors configured to direct radiation towards a pupil plane and an array of lenses configured to direct radiation sub-beams towards the array of controllable mirrors,
wherein a first lens of the array of lenses and a controllable mirror of the array of controllable mirrors forms a first optical channel having a first optical power and a second lens of the array of lenses and a controllable mirror of the array of controllable mirrors forms a second optical channel having a second optical power, and wherein the first optical power is different from the second optical power.
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14. A lithographic apparatus comprising:
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an illumination system configured to provide a beam of radiation comprising; an array of controllable mirrors configured to direct radiation towards a pupil plane and an array of lenses configured to direct radiation sub-beams towards the array of controllable mirrors, wherein a first lens of the array of lenses and a controllable mirror of the array of controllable mirrors forms a first optical channel having a first optical power and a second lens of the array of lenses and a controllable mirror of the array of controllable mirrors forms a second optical channel having a second optical power, and wherein the first optical power is different from the second optical power; a support structure for supporting a patterning device, the patterning device serving to impart the radiation beam with a pattern in its cross-section; a substrate table for holding a substrate; and a projection system for projecting the patterned radiation beam onto a target portion of the substrate. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An illumination system comprising at least two arrays of controllable mirrors for directing radiation towards a pupil plane and at least two associated arrays of lenses configured to direct radiation sub-beams towards the at least two arrays of controllable mirrors;
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(a) wherein the lenses and controllable mirrors of the first array form optical channels having a first optical power, and the lenses and controllable mirrors of the second array form optical channels having a second optical power, such that radiation sub-beams formed by the first array of lenses and controllable mirrors have a first cross-sectional area and shape at the pupil plane of the illumination system, and radiation sub-beams formed by the second array of lenses and controllable mirrors have a second different cross-sectional area and/or shape at the pupil plane of the illumination system, and wherein the first optical power is different from the second optical power.
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27. A method of forming an illumination mode, the method comprising:
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using an array of lenses to separate a radiation beam into radiation sub-beams which are incident upon mirrors of an array of controllable mirrors, and using the array of controllable mirrors to direct the sub-beams of radiation towards a pupil plane; wherein a first lens and a controllable mirror form a first optical channel having a first optical power and a second lens and a controllable mirror form a second optical channel having a second optical power, and wherein the first optical power is different from the second optical power. - View Dependent Claims (28)
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Specification