Interferometric analysis method for the manufacture of nano-scale devices
First Claim
Patent Images
1. A method, comprising:
- collecting multiple alignment data for a first substrate and a second substrate from phase information using moiré
based alignment marks disposed on the first substrate and the second substrate; and
wherein moiré
images are captured by diffracted light from the marks on the first substrate and the second substrate; and
wherein all imaging microscopes used in the alignment process are positioned outside of a beam path from a UV source and focused through the first substrate to the second substrate.
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Abstract
The present invention features a method to determine relative spatial parameters between two coordinate systems, which may be a mold and a region of a substrate in which mold is employed to generate a pattern. The method includes sensing relative alignment between the two coordinate systems at multiple points and determines relative spatial parameters therebetween. The relative spatial parameters include a relative area and a relative shape.
217 Citations
20 Claims
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1. A method, comprising:
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collecting multiple alignment data for a first substrate and a second substrate from phase information using moiré
based alignment marks disposed on the first substrate and the second substrate; andwherein moiré
images are captured by diffracted light from the marks on the first substrate and the second substrate; andwherein all imaging microscopes used in the alignment process are positioned outside of a beam path from a UV source and focused through the first substrate to the second substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method, comprising:
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positioning a first substrate in superimposition with a second substrate; positioning a UV source in superimposition with the first substrate; and
,determining, by multiple image capturing units, relative spatial parameters between the first substrate and the second substrate, determining the relative spatial parameters including capturing moiré
images diffracted into oblique vectors normal to axes of measuring data;wherein the multiple image capturing units are positioned outside of the UV beam. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method comprising:
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positioning a first substrate in superimposition with a second substrate; positioning a UV source in superimposition with the first substrate; and
,determining, by multiple image capturing units, relative spatial parameters between the first substrate and the second substrate, determining the relative spatial parameters including capturing moiré
images diffracted into oblique vectors normal to axes of measuring data, each image capturing unit including a source of illumination and a detector, with the source of illumination directing energy along a path to impinge on the first substrate creating a first order diffraction energy and the detector configured to sense the first order diffraction energy propagating along the path;wherein the moiré
images are captured by diffracted light from a mark on the first substrate and the second substrate; and
,wherein the multiple image capturing units are positioned outside of the UV beam.
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Specification