Forward simulation of coherent beams on grating structures for coherent scatterometry

Martin Hammerschmidt; Lin Zschiedrich; Lauryna Siaudinyté; Phillip Manley; Philipp-Immanuel Schneider; Sven Burger

doi:10.1117/12.2673231

23 August 2023 Forward simulation of coherent beams on grating structures for coherent scatterometry

Martin Hammerschmidt, Lin Zschiedrich, Lauryna Siaudinyté, Phillip Manley, Philipp-Immanuel Schneider, Sven Burger

Proceedings Volume PC12619, Modeling Aspects in Optical Metrology IX; PC1261907 (2023) https://doi.org/10.1117/12.2673231
Event: SPIE Optical Metrology, 2023, Munich, Germany

Abstract

Modelling the scattering of focused, coherent light by nano-scale structures is oftentimes used to reconstruct or infer geometrical or material properties of structures under investigation in optical scatterometry. This comprises both periodic and aperiodic nano-structures. Coherent Fourier scatterometry with focused light exploits the diffraction pattern formed by the nano-structures in Fourier plane. While the scattering of a focused beam by a spatially isolated scatterer is a standard modelling task for state-of-the art electromagnetic solvers based, e.g., on the finite element method, the case of periodically structured samples is more involved. In particular when the focused light covers several grating periods of as it is commonly the case. We will present a coherent illumination model for scattering of focused beams such as Gaussian- and Besselbeams by periodic structures such as line gratings. The model allows to take into account optical wavefront aberrations in optical systems used for both, the illumination and detection of the scattered fields. We compare the model with strategies implemented on large-scale super-cells and inverse Floquet-transform strategies to superimpose both near- and far fields coherently.

Conference Presentation

Citation Download Citation

Martin Hammerschmidt, Lin Zschiedrich, Lauryna Siaudinyté, Phillip Manley, Philipp-Immanuel Schneider, and Sven Burger "Forward simulation of coherent beams on grating structures for coherent scatterometry", Proc. SPIE PC12619, Modeling Aspects in Optical Metrology IX, PC1261907 (23 August 2023); https://doi.org/10.1117/12.2673231

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