Method for removal of a deposition from an optical element, lithographic apparatus, and method for manufacturing a device
First Claim
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1. A method of removing a deposition from an optical element of an apparatus, the method comprising:
- providing a hydrogen comprising gas in at least a part of the apparatus;
providing nitrogen radicals in said part of the apparatus for generating hydrogen radicals from the hydrogen comprising gas; and
contacting the optical element with at least part of the hydrogen radicals to removal said deposition.
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Abstract
A method of removing a deposition from an optical element of an apparatus. The method includes providing a hydrogen comprising gas in at least a part of the apparatus, providing nitrogen radicals in the part of the apparatus for generating hydrogen radicals from the hydrogen comprising gas, and contacting the optical element with at least part of the hydrogen radicals to removal the deposition.
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Citations
31 Claims
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1. A method of removing a deposition from an optical element of an apparatus, the method comprising:
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providing a hydrogen comprising gas in at least a part of the apparatus; providing nitrogen radicals in said part of the apparatus for generating hydrogen radicals from the hydrogen comprising gas; and contacting the optical element with at least part of the hydrogen radicals to removal said deposition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus comprising:
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an optical element; a first inlet configured to provide hydrogen comprising gas in at least part of the apparatus; and a second inlet configured to provide nitrogen radicals in said part of the apparatus to generate hydrogen radicals from the hydrogen comprising gas. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A lithographic apparatus comprising:
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an illumination system comprising a first optical element constructed to condition a radiation beam; a support constructed to support a patterning device, the patterning device being configured to impart the radiation beam with a pattern in its cross-section to form a patterned radiation beam; a substrate table constructed to hold a substrate; a projection system comprising a second optical element configured to project the patterned radiation beam onto a target portion of the substrate; a hydrogen comprising gas; and a source of nitrogen radicals arranged to generate hydrogen radicals from the hydrogen comprising gas to remove a deposition from at least a surface of the first optical element and/or the second optical element. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A device manufacturing method comprising:
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projecting a patterned beam of radiation onto a substrate using a lithographic apparatus; and providing nitrogen radicals in an atmosphere of the lithographic apparatus for interacting with a hydrogen comprising gas present in said atmosphere for generating hydrogen radicals for removing a deposition from a surface of an optical element of the lithographic apparatus. - View Dependent Claims (31)
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Specification