Lithographic apparatus having a liquid detection system
First Claim
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1. A lithographic projection apparatus comprising:
- a substrate table configured to hold a substrate;
a projection system arranged to project a patterned beam of radiation onto the substrate;
a liquid supply system configured to supply a liquid to a space between the projection system and the substrate table; and
a residual liquid detector configured to detect the liquid on i) the substrate when held by the substrate table, ii) the substrate table, iii) a further movable table of the lithographic apparatus, or iv) any combination selected from i) to iii), wherein the residual liquid detector comprises an alignment sensor configured to detect the liquid or a sensor configured to measure a distance and/or tilt of a solid surface and to detect the liquid.
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Abstract
In immersion lithography after exposure of a substrate is complete, a detector is used to detect any residual liquid remaining on the substrate and/or substrate table.
155 Citations
21 Claims
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1. A lithographic projection apparatus comprising:
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a substrate table configured to hold a substrate; a projection system arranged to project a patterned beam of radiation onto the substrate; a liquid supply system configured to supply a liquid to a space between the projection system and the substrate table; and a residual liquid detector configured to detect the liquid on i) the substrate when held by the substrate table, ii) the substrate table, iii) a further movable table of the lithographic apparatus, or iv) any combination selected from i) to iii), wherein the residual liquid detector comprises an alignment sensor configured to detect the liquid or a sensor configured to measure a distance and/or tilt of a solid surface and to detect the liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A lithographic projection apparatus comprising:
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a projection system arranged to project a patterned beam of radiation onto a substrate; a liquid supply system configured to supply a liquid to a space between the projection system and a movable table; and a same detector configured to both determine a distance, tilt and/or alignment of a solid object and detect the liquid on the object. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A lithographic projection apparatus comprising:
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a projection system arranged to project a patterned beam of radiation onto a substrate; a liquid supply system configured to supply a liquid to a space between the projection system and a movable table; and a detector configured to detect, after exposure of a surface to the liquid in the space, presence of the liquid on the surface, the detector comprising an alignment sensor or a sensor configured to measure a distance and/or tilt of a solid surface. - View Dependent Claims (20)
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21. A lithographic projection apparatus comprising:
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a projection system arranged to project a patterned beam of radiation onto a substrate; a liquid supply system configured to supply liquid to a space between the projection system and a movable table; a radiation output configured to direct a beam of radiation onto or adjacent a surface in the lithographic apparatus, the surface exposed to liquid in the space; and a detector configured to detect, after exposure of a surface to the liquid in the space, presence of the liquid on the surface, the detector configured to detect reflected or refracted radiation from the beam and determine, from the detection, the presence of the liquid on the surface, the detector comprising an alignment sensor or a level sensor configured to measure a distance and/or tilt of a solid surface, the alignment sensor or level sensor configured to detect the reflected or refracted radiation in parallel with projection of the patterned beam by the projection system.
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Specification