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Method and apparatus for angular-resolved spectroscopic lithography characterization

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TLDR
In this article, an apparatus and method are disclosed for determining the properties of a substrate by measuring the angle-resolved spectrum as a result of the radiation being reflected off the substrate in the pupil plane of the high numerical aperture lens.
Abstract
According to the present invention, an apparatus and method are disclosed for determining the properties of a substrate by measuring the angle-resolved spectrum as a result of the radiation being reflected off the substrate in the pupil plane of the high numerical aperture lens. The properties may be dependent on angle and wavelength and may include the intensity of TM- and TE-polarized light and their associated phase differences.

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Patent

Method and apparatus for angular-resolved spectroscopic lithography characterization

TL;DR: In this article, a method to determine a property of a substrate by measuring, in the pupil plane of a high numerical aperture lens, an angle-resolved spectrum as a result of radiation being reflected off the substrate was proposed.
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