Pupil filtering for a lithographic tool
First Claim
Patent Images
1. A mask or reticle for use in a lithographic system, the mask or reticle comprising:
- a substrate including an integrated circuit (IC) pattern representing at least one integrated circuit feature and a pupil filter pattern.
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Abstract
A mask or reticle is optimized for use in a lithographic system. The mask or reticle includes a substrate and a pupil filter pattern. The substrate includes an IC pattern representing at least one integrated circuit feature. The pupil filter pattern can enhance the resolution associated with the lithographic system.
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Citations
20 Claims
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1. A mask or reticle for use in a lithographic system, the mask or reticle comprising:
a substrate including an integrated circuit (IC) pattern representing at least one integrated circuit feature and a pupil filter pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of enhancing resolution of a lithographic system, the lithographic system including a pupil, the method comprising:
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providing a mask or reticle having an integrated circuit (IC) pattern; and
providing a pupil filter pattern on the mask or reticle. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A lithographic system for use in integrated circuit fabrication, the lithographic system including lens assemblies represented by a pupil, the lithographic system comprising:
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a mask means for patterning radiation according to an integrated circuit pattern; and
a pupil filter means for patterning radiation in accordance with a Fourier transform of a hypothetical pupil filter located at a pupil plane. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification