Lithographic apparatus and device manufacturing method using interferometric and other exposure
First Claim
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1. A lithographic apparatus for exposing a pattern on a substrate, comprising:
- a substrate support that is configured to support a substrate;
an exposure unit that is configured to project two beams of pulsed radiation onto the substrate, such that each of the two beams of pulsed radiation interfere with each other to produce a series of separate exposures comprising a first exposure during a first exposure period and a second exposure during a second exposure period, the first and second exposure periods being successive, to expose a first set of parallel lines whereby a first target area of a plurality of target areas is exposed during the first exposure period and a second target area of the plurality of target areas is exposed during the second exposure period on the substrate during each pass across the substrate, each of the first and second target areas being in an area smaller than a width of the substrate; and
an actuator that is configured to continuously move the substrate support relative to the exposure unit during exposure of the parallel lines on the first and second target areas of the substrate,wherein during a third exposure period to expose a second set of parallel lines, only, one of the second set of parallel lines overlaps and aligns with only one of the parallel lines of the first set of parallel lines.
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Abstract
A lithographic apparatus including an exposure unit that exposes parallel lines on a target area of a substrate by projecting two beams of radiation onto the substrate. The two beams of radiation are projected such that they interfere with each other to form the parallel lines. An actuator continuously moves the substrate relative to the exposure unit, while the exposure unit exposes the parallel lines on the target areas on the substrate.
75 Citations
34 Claims
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1. A lithographic apparatus for exposing a pattern on a substrate, comprising:
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a substrate support that is configured to support a substrate; an exposure unit that is configured to project two beams of pulsed radiation onto the substrate, such that each of the two beams of pulsed radiation interfere with each other to produce a series of separate exposures comprising a first exposure during a first exposure period and a second exposure during a second exposure period, the first and second exposure periods being successive, to expose a first set of parallel lines whereby a first target area of a plurality of target areas is exposed during the first exposure period and a second target area of the plurality of target areas is exposed during the second exposure period on the substrate during each pass across the substrate, each of the first and second target areas being in an area smaller than a width of the substrate; and an actuator that is configured to continuously move the substrate support relative to the exposure unit during exposure of the parallel lines on the first and second target areas of the substrate, wherein during a third exposure period to expose a second set of parallel lines, only, one of the second set of parallel lines overlaps and aligns with only one of the parallel lines of the first set of parallel lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A device manufacturing method, comprising:
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using an exposure unit to project two beams of pulsed radiation onto a substrate, such that each of the two beams interfere with each other to produce a series of separate exposures comprising a first exposure during a first exposure period and a second exposure during a second exposure period, the first and second exposure periods being successive, to expose a first set of parallel lines whereby a first target area is exposed during the first exposure period and a second target area is exposed during the second exposure period on the substrate during each pass across the substrate, each of the first and second target areas being an area smaller than a width of the substrate supported on a substrate support; and continuously moving the substrate support relative to the exposure unit, while the parallel lines are exposed on the first and second target areas on the substrate by the exposure unit, wherein during a third exposure period to expose a second set of parallel lines, only one of the second set of parallel lines overlaps and aligns with only one of the parallel lines of the first set of parallel lines. - View Dependent Claims (33, 34)
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Specification