Methods and systems for evaluating extreme ultraviolet mask flatness
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United States of America Patent
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Aug 11, 2015
Grant Date -
Mar 29, 2012
app pub date -
Sep 21, 2011
filing date -
Sep 27, 2010
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Abstract
Disclosed are methods and systems for determining a topography of a lithographic optical element and/or a holder of a lithographic optical element. In one embodiment, the method includes directing electromagnetic radiation towards a lithographic optical element, where the electromagnetic radiation comprises electromagnetic radiation in a first predetermined wavelength range and electromagnetic radiation in a second predetermined wavelength range. The method further includes using the lithographic optical element to adsorb the electromagnetic radiation in the first predetermined wavelength range, and to reflect at least a portion of the electromagnetic radiation in the second predetermined wavelength range towards a substrate comprising a photosensitive layer, thereby exposing the photosensitive layer to form an exposed photosensitive layer. The method still further includes performing an evaluation of the exposed photosensitive layer and, based on the evaluation, determining a topography of the lithographic optical element.
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- 15 United States
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Lee, Sang | Saratoga, US | 72 | 560 |
Lorusso, Gian Francesco | Overijse, BE | 17 | 65 |
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