Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths

The interest of the astrophysics community to make space observations in the vacuum ultraviolet (VUV, 100-200 nm) triggers the research to overcome the challenges to develop efficient VUV optics due to material absorption and the limited knowledge of optical constants. Future space observatories lik...

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Autores: López-Reyes, Paloma, Honrado-Benítez, Carlos, Gutiérrez-Luna, Nuria, Larruquert, Juan Ignacio
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/386036
Acceso en línea:http://hdl.handle.net/10261/386036
https://api.elsevier.com/content/abstract/scopus_id/85200318671
Access Level:acceso abierto
Palabra clave:Fluorides
Lyman alpha
Multilayer coatings
Narrowband mirrors
Space optics
Vacuum ultraviolet
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spelling Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengthsLópez-Reyes, PalomaHonrado-Benítez, CarlosGutiérrez-Luna, NuriaLarruquert, Juan IgnacioFluoridesLyman alphaMultilayer coatingsNarrowband mirrorsSpace opticsVacuum ultravioletThe interest of the astrophysics community to make space observations in the vacuum ultraviolet (VUV, 100-200 nm) triggers the research to overcome the challenges to develop efficient VUV optics due to material absorption and the limited knowledge of optical constants. Future space observatories like the “Habitable Worlds Observatory, HWO/NASA” require efficient coatings capable of providing high-throughput image bandpasses in the VUV which is currently included as a NASA technology gap. Among the scarce transparent materials in this range, some metal fluoride materials exhibit the shortest cutoffs. Typically, high-reflective narrowband coatings consist of periodic combinations of fluoride multilayers (MLs), with relatively high contrasting refractive index, such as MgF2/LaF3 or AlF3/LaF3 MLs. In this context, GOLD-IO-CSIC group has been developing high-performance all-dielectric VUV coatings, with special emphasis on short wavelengths down to 120 nm. This short VUV range is relatively unexplored and shows a comparatively lower performance due to the increased absorption of fluorides towards shorter wavelengths. Here, we present coatings based on combinations of MgF2/LaF3 and AlF3/LaF3 MLs, which can be tuned at any VUV wavelength >120 nm with a remarkable performance above 85% at H Ly-α (121.6 nm) for AlF3/LaF3 MLs; this improves the state-of-the-art at such short wavelengths. We also present a comparative study on the nanostructural morphologies of the two sets of MLs. Both the selection of the ML materials and the introduction of some aperiodicity on the ML designs allow choosing the bandwidth or the desired optical profile with remarkable freedom. Below ~120 nm there is no suitable combination of fluorides since all fluorides but LiF turn absorbing. We, then, present narrowband coatings based on Al, LiF, and SiC films, tuned at ~100 nm, with a strong rejection at the close H Ly-α line that could mask the observations.Peer reviewedConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_5794info:eu-repo/semantics/conferenceObjecthttp://hdl.handle.net/10261/386036https://api.elsevier.com/content/abstract/scopus_id/85200318671reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésProceedings of SPIE - The International Society for Optical EngineeringSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3860362026-05-22T06:33:51Z
dc.title.none.fl_str_mv Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths
title Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths
spellingShingle Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths
López-Reyes, Paloma
Fluorides
Lyman alpha
Multilayer coatings
Narrowband mirrors
Space optics
Vacuum ultraviolet
title_short Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths
title_full Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths
title_fullStr Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths
title_full_unstemmed Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths
title_sort Narrowband mirrors based on fluorides tuned at vacuum ultraviolet wavelengths
dc.creator.none.fl_str_mv López-Reyes, Paloma
Honrado-Benítez, Carlos
Gutiérrez-Luna, Nuria
Larruquert, Juan Ignacio
author López-Reyes, Paloma
author_facet López-Reyes, Paloma
Honrado-Benítez, Carlos
Gutiérrez-Luna, Nuria
Larruquert, Juan Ignacio
author_role author
author2 Honrado-Benítez, Carlos
Gutiérrez-Luna, Nuria
Larruquert, Juan Ignacio
author2_role author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Fluorides
Lyman alpha
Multilayer coatings
Narrowband mirrors
Space optics
Vacuum ultraviolet
topic Fluorides
Lyman alpha
Multilayer coatings
Narrowband mirrors
Space optics
Vacuum ultraviolet
description The interest of the astrophysics community to make space observations in the vacuum ultraviolet (VUV, 100-200 nm) triggers the research to overcome the challenges to develop efficient VUV optics due to material absorption and the limited knowledge of optical constants. Future space observatories like the “Habitable Worlds Observatory, HWO/NASA” require efficient coatings capable of providing high-throughput image bandpasses in the VUV which is currently included as a NASA technology gap. Among the scarce transparent materials in this range, some metal fluoride materials exhibit the shortest cutoffs. Typically, high-reflective narrowband coatings consist of periodic combinations of fluoride multilayers (MLs), with relatively high contrasting refractive index, such as MgF2/LaF3 or AlF3/LaF3 MLs. In this context, GOLD-IO-CSIC group has been developing high-performance all-dielectric VUV coatings, with special emphasis on short wavelengths down to 120 nm. This short VUV range is relatively unexplored and shows a comparatively lower performance due to the increased absorption of fluorides towards shorter wavelengths. Here, we present coatings based on combinations of MgF2/LaF3 and AlF3/LaF3 MLs, which can be tuned at any VUV wavelength >120 nm with a remarkable performance above 85% at H Ly-α (121.6 nm) for AlF3/LaF3 MLs; this improves the state-of-the-art at such short wavelengths. We also present a comparative study on the nanostructural morphologies of the two sets of MLs. Both the selection of the ML materials and the introduction of some aperiodicity on the ML designs allow choosing the bandwidth or the desired optical profile with remarkable freedom. Below ~120 nm there is no suitable combination of fluorides since all fluorides but LiF turn absorbing. We, then, present narrowband coatings based on Al, LiF, and SiC films, tuned at ~100 nm, with a strong rejection at the close H Ly-α line that could mask the observations.
publishDate 2024
dc.date.none.fl_str_mv 2024
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_5794
dc.type.openaire.fl_str_mv info:eu-repo/semantics/conferenceObject
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/386036
https://api.elsevier.com/content/abstract/scopus_id/85200318671
url http://hdl.handle.net/10261/386036
https://api.elsevier.com/content/abstract/scopus_id/85200318671
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Proceedings of SPIE - The International Society for Optical Engineering
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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