Method and apparatus for design of a metrology target
First Claim
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1. A method comprising:
- producing a plurality of metrology targets by a manufacturing process, the plurality of metrology targets having been designed for different wavelengths or polarizations of an incident radiation or process stacks;
measuring light scattered by the plurality of metrology targets;
determining a modification value for each metrology target; and
determining a multiplication factor for each metrology target based on its corresponding modification value.
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Abstract
A method and apparatus are described for providing an accurate and robust measurement of a lithographic characteristic or metrology parameter. The method includes providing a range or a plurality of values for each of a plurality of metrology parameters of a metrology target, providing a constraint for each of the plurality of metrology parameters, and calculating, by a processor to optimize/modify these parameters within the range of the plurality of values, resulting in a plurality of metrology target designs having metrology parameters meeting the constraints.
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9 Claims
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1. A method comprising:
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producing a plurality of metrology targets by a manufacturing process, the plurality of metrology targets having been designed for different wavelengths or polarizations of an incident radiation or process stacks; measuring light scattered by the plurality of metrology targets; determining a modification value for each metrology target; and determining a multiplication factor for each metrology target based on its corresponding modification value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification