A 3D numerical study of pinhole diffraction in visible-light point diffraction interferometry

Tingwen Xing; Jiajun Xu; Fuchao Xu

doi:10.1117/12.904713

15 November 2011 A 3D numerical study of pinhole diffraction in visible-light point diffraction interferometry

Tingwen Xing, Jiajun Xu, Fuchao Xu

Proceedings Volume 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation; 83211O (2011) https://doi.org/10.1117/12.904713
Event: Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 2011, Yunnan, China

Abstract

The projection objectives，used in modern projection lithography, such as deep-ultraviolet lithography (DUVL), or extreme-ultraviolet lithography (EUVL), desire very high-quality optics. It has placed stringent requirements on the accuracy of the interferometers used for optical metrology. Point diffraction interferometry, which generates a spherical reference wave front by pinhole diffraction, has been developed to meet this need. In order to estimate the measurement accuracy, several scalar wave diffraction methods have been used when the diameter of the pinhole is much larger than the wavelength. However, while the diameter keeps decreasing, ultimately to the order of the wavelength, it is obviously not appropriate to calculate in the same way. So, a three-dimensional (3-D) electromagnetic field simulation, based on Finite Element Method (FEM), is set up to study the propagation of the visible- light, 632.8 nm wavelength, through sub- 1000nm diameter pinholes in a chromium membrane. Deviations have been calculated to predict the accuracy, between perfect sphere and the wave front, diffracted by a series of pinholes with different diameters.

Citation Download Citation

Tingwen Xing, Jiajun Xu, and Fuchao Xu "A 3D numerical study of pinhole diffraction in visible-light point diffraction interferometry", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83211O (15 November 2011); https://doi.org/10.1117/12.904713

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