Methods and systems for inspecting reticles using aerial imaging at off-stepper wavelengths
First Claim
1. A method for inspecting a reticle, comprising:
- forming an aerial image of the reticle with an inspection system at a wavelength different from a wavelength of an exposure system;
correcting the aerial image for differences between modulation transfer functions of the inspection system and the exposure system such that the corrected aerial image is substantially equivalent to an image of the reticle that would be printed onto a specimen by the exposure system at the wavelength of the exposure system; and
detecting defects on the reticle using the corrected aerial image.
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Accused Products
Abstract
Methods and systems for inspecting a reticle are provided. A method may include forming an aerial image of the reticle with an inspection system at a wavelength different from a wavelength of an exposure system. The method may also include correcting the aerial image for differences between modulation transfer functions (MTF) of the inspection system and the exposure system. In this manner, the corrected aerial image may be substantially equivalent to an image of the reticle that would be printed onto a specimen by the exposure system at the wavelength of the exposure system. In addition, the method may include detecting defects on the reticle using the corrected aerial image. The detected defects may include approximately all of the defects that would be printed onto a specimen by the exposure system using the reticle.
141 Citations
20 Claims
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1. A method for inspecting a reticle, comprising:
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forming an aerial image of the reticle with an inspection system at a wavelength different from a wavelength of an exposure system; correcting the aerial image for differences between modulation transfer functions of the inspection system and the exposure system such that the corrected aerial image is substantially equivalent to an image of the reticle that would be printed onto a specimen by the exposure system at the wavelength of the exposure system; and detecting defects on the reticle using the corrected aerial image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for inspecting a reticle, comprising:
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forming an aerial image of the reticle with an inspection system at a wavelength different from a wavelength of an exposure system, wherein the inspection system has a modulation transfer function approximately equal to a modulation transfer function of the exposure system; and detecting defects on the reticle using the aerial image. - View Dependent Claims (11)
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12. A system configured to inspect a reticle, comprising:
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an inspection system configured to form an aerial image of the reticle at a wavelength different from a wavelength of an exposure system; and a processor configured to correct the aerial image for differences between modulation transfer functions of the inspection system and the exposure system such that the corrected aerial image is substantially equivalent to an image of the reticle that would be printed onto a specimen by the exposure system at the wavelength of the exposure system and to detect defects on the reticle using the corrected aerial image. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification