Modification of boundaries conditions in the FDTD algorithm for EUV mask modeling

Alexandre Vial; Andreas Erdmann; Thomas Schmoeller; Christian K. Kalus

doi:10.1117/12.476992

1 August 2002 Modification of boundaries conditions in the FDTD algorithm for EUV mask modeling

Alexandre Vial, Andreas Erdmann, Thomas Schmoeller, Christian K. Kalus

Proceedings Volume 4754, Photomask and Next-Generation Lithography Mask Technology IX; (2002) https://doi.org/10.1117/12.476992
Event: Photomask and Next Generation Lithography Mask Technology IX, 2002, Yokohama, Japan

Abstract

Rigorous modeling of diffraction from the mask is one of the most critical points in the extension of lithography simulation from its traditional spectral range between 150 and 500 nm into the area of extreme ultraviolet (EUV) between 10 and 15 nm. A typical EUV mask is made of a reflective multilayer (Mo/Si or Mo/Be for example) deposited on a substrate. Above the multilayer, a buffer layer acts as an etch stopper, and an absorber is used for the mask pattern. If we limit our scope to layers without defect, most of the mask parts can actually be described by analytical methods such as transfer matrices. Therefore we decided to split the mask into two parts : the first part includes the absorber and the buffer layer and it will be studied using a finite-difference time-domain (FDTD) algorithm, the second part includes the reflective multilayer and the substrate and it will be simply described by transfer matrices.

Citation Download Citation

Alexandre Vial, Andreas Erdmann, Thomas Schmoeller, and Christian K. Kalus "Modification of boundaries conditions in the FDTD algorithm for EUV mask modeling", Proc. SPIE 4754, Photomask and Next-Generation Lithography Mask Technology IX, (1 August 2002); https://doi.org/10.1117/12.476992

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