by P. López-Reyes, E. Enríquez, M. L. Crespillo, L. V. Rodríguez-De Marcos, J. Olivares and J. I. Larruquert
Abstract:
Developing high-quality optical components for far ultraviolet (FUV) spectrum is gaining significance in space observations. Optical elements designed for a narrowband FUV response rely on coatings made of thin multilayers (MLs), alternating between two materials with low optical absorption and significantly contrasting refractive indices. Recent research shows that (AlF3/LaF3) systems outperform (MgF2/LaF3) coatings in FUV optical reflectance due to two critical factors: 1) AlF3′s lower refractive index compared to MgF2, and 2) structural properties resulting from a trade-off between the number of bilayers, contributing to higher reflectance, and the tendency for roughness to increase with the total coating thickness, limiting FUV optical performance. This study conducts a comprehensive examination of the nano-microstructure of these MLs, using three techniques: AFM for surface characterization, cross-sectional SEM micrographs with backscattered electrons, and Rutherford Backscattering Spectrometry (RBS) for in-depth structural and compositional analysis. A strong correlation is observed between roughness, grain size, composition, and intermixing, impacting the optical response in the FUV range. Nanometer-scale intermixing between layers is estimated using RBS. These findings provide a foundation for modeling FUV optical reflectance in MLs, enabling the optimization of their design through materials engineering to achieve more efficient optical devices for FUV applications in space observations.
Reference:
P. López-Reyes, E. Enríquez, M. L. Crespillo, L. V. Rodríguez-De Marcos, J. Olivares and J. I. Larruquert, “Unveiling the effects of the surface and in-depth nanostructure on the far-UV optical reflectance of thin fluoride multilayer coatings”, Applied Surface Science, vol. 640, pp. 158455.
Bibtex Entry:
@article{lopez-reyes_unveiling_2023,
title = {Unveiling the effects of the surface and in-depth nanostructure on the far-{UV} optical reflectance of thin fluoride multilayer coatings},
volume = {640},
issn = {0169-4332},
url = {https://www.sciencedirect.com/science/article/pii/S0169433223021359},
doi = {10.1016/j.apsusc.2023.158455},
abstract = {Developing high-quality optical components for far ultraviolet (FUV) spectrum is gaining significance in space observations. Optical elements designed for a narrowband FUV response rely on coatings made of thin multilayers (MLs), alternating between two materials with low optical absorption and significantly contrasting refractive indices. Recent research shows that (AlF3/LaF3) systems outperform (MgF2/LaF3) coatings in FUV optical reflectance due to two critical factors: 1) AlF3′s lower refractive index compared to MgF2, and 2) structural properties resulting from a trade-off between the number of bilayers, contributing to higher reflectance, and the tendency for roughness to increase with the total coating thickness, limiting FUV optical performance. This study conducts a comprehensive examination of the nano-microstructure of these MLs, using three techniques: AFM for surface characterization, cross-sectional SEM micrographs with backscattered electrons, and Rutherford Backscattering Spectrometry (RBS) for in-depth structural and compositional analysis. A strong correlation is observed between roughness, grain size, composition, and intermixing, impacting the optical response in the FUV range. Nanometer-scale intermixing between layers is estimated using RBS. These findings provide a foundation for modeling FUV optical reflectance in MLs, enabling the optimization of their design through materials engineering to achieve more efficient optical devices for FUV applications in space observations.},
urldate = {2023-09-26},
journal = {Applied Surface Science},
author = {López-Reyes, P. and Enríquez, E. and Crespillo, M. L. and Rodríguez-De Marcos, L. V. and Olivares, J. and Larruquert, J. I.},
month = dec,
year = {2023},
keywords = {Far-UV optical reflectance, Intermixing, Nanostructure, Thin film fluoride multilayers coatings},
pages = {158455},
file = {ScienceDirect Full Text PDF:E:\Usuarios\Administrator\Zotero\storage\YPEMECEB\López-Reyes et al. - 2023 - Unveiling the effects of the surface and in-depth .pdf:application/pdf;ScienceDirect Snapshot:E:\Usuarios\Administrator\Zotero\storage\THLYAB9G\S0169433223021359.html:text/html},
}