1. Analyses of tabulated optical constants for thin films in the EUV range and application to solar physics multilayer coatings
- Author
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Regina Soufli, Franck Delmotte, Jennifer Rebellato, F. Auchère, Sébastien de Rossi, Xueyan Zhang, Evgueni Meltchakov, Laboratoire Charles Fabry / Optique XUV, Laboratoire Charles Fabry (LCF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS), Centre National d'Études Spatiales [Toulouse] (CNES), Lawrence Livermore National Laboratory (LLNL), Institut d'astrophysique spatiale (IAS), and Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Zirconium ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,Materials science ,business.industry ,Extreme ultraviolet lithography ,chemistry.chemical_element ,02 engineering and technology ,Boron carbide ,021001 nanoscience & nanotechnology ,01 natural sciences ,Spectral line ,010309 optics ,chemistry.chemical_compound ,chemistry ,Extreme ultraviolet ,0103 physical sciences ,Silicon carbide ,Transmittance ,Optoelectronics ,Thin film ,[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] ,0210 nano-technology ,business ,ComputingMilieux_MISCELLANEOUS - Abstract
The thin film optical constants are key parameters to carry out optical simulation or optimization of multilayer mirrors with high efficiency. However, for most materials, different sets of optical constants can be found in the literature especially in the EUV range, as these parameters are not as well-known in the EUV as in the visible or wavelength range. In this work, we have used several reflectance and transmittance measurements in the wavelength range from 10 nm to 60 nm. Different optical constant files have been tested and compared with the IMD simulation software. We will present some experimental spectra and theoretical simulations to highlight the existing problem on the reliability of optical constants sets and to discuss potential solutions. We focus our research on a few materials of particular interest in the EUV range such as aluminum, aluminum oxide, molybdenum, zirconium, magnesium, silicon carbide, and boron carbide. These analyses lead us to select the most reliable and accurate optical constants set, or to create the best one from the concatenation of existing data for each material of interest.
- Published
- 2018
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