Design of soft x-ray high diffraction efficiency and spectral flux Au/Ni bilayer coated laminar-type diffraction grating for objective soft x-ray flat-field spectrograph in a region of 250–550 eV
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Le résumé fourni par la source
An objective soft x-ray flat-field spectrograph employing a laminar-type bilayer coated, varied-line-spacing, spherical grating was designed to improve the detection limit and sensitivity of soft x-ray flat-field spectrographs in a region of 250-550 eV. As a design criterion, spectral flux, SF, [Hatano et al., Appl. Opt. 60, 4993-4999 (2021)], which is proportional to the amount of optical flux incident onto a detector and correlated with detection sensitivity, was used to be maximized. To enhance reflectivity with the coating design, Au/Ni bilayer coating was investigated to optimize the incidence angle and thickness of the Ni layer. This is based on the consideration that, in an energy region of over 400 eV, refractive indices of Au (bottom layer), Ni (top layer), and vacuum are increased from the bottom to the top of the layers, and a supplemental enhancement of reflectivity can be expected by optimizing the thickness of the top layer. Thus, the thickness of Ni and the incidence angle were chosen to be 8.0 nm and 86.00°, respectively. To maintain dispersion and spectral resolution of the grating used at an incidence angle of 87.07° as previously designed, groove density was increased to 1500 lines/mm from 1200 lines/mm of our previous design. Finally, a holographic, varied-line-spacing, spherical grating was designed assuming an aspherical-wavefront-recording configuration. The numerical simulation results showed that the spectrograph employing newly designed grating with laminar-type grooves and Au/Ni bilayer coating exhibited 2-18 times higher spectral flux as well as an improved spectral resolution compared with those obtained with the previously designed gratings and spectrographs.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Design of soft x-ray high diffraction efficiency and spectral flux Au/Ni bilayer coated laminar-type diffraction grating for objective soft x-ray flat-field spectrograph in a region of 250–550 eV
- Date Crossref
- 01/12/2024
- Éditeur
- AIP Publishing
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Hyogo Laboratory of Advanced Science and Technology for Industry (LASTI) pays non établi dans la noticeUniversité ou école supérieure
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Tohoku University Institute of Multidisciplinary Research for Advanced Materials (IMRAM) pays non établi dans la noticeUniversité ou école supérieure
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National Institutes for Quantum Science and Technology pays non établi dans la noticeStructure de recherche
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JEOL (Japan) pays non établi dans la noticeEntreprise
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Shimadzu (Japan) pays non établi dans la noticeEntreprise
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Graduate School of Engineering Department of Chemical Biology pays non établi dans la noticeUniversité ou école supérieure
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Kansai Institute for Photon Science (KPSI) pays non établi dans la noticeStructure de recherche
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SA Business Unit pays non établi dans la noticeEntreprise
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Device Department pays non établi dans la noticeInstitution
Laboratory of Advanced Science and Technology for Industry (LASTI) — University of Hyogo, Institute of Multidisciplinary Research for Advanced Materials (IMRAM) — Tohoku University et National Institutes for Quantum Science and Technology, avec 6 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.