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High-efficiency X-ray multilayer-coated blazed gratings with shifted boundaries.

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Title: High-efficiency X-ray multilayer-coated blazed gratings with shifted boundaries.
Authors: Lubov M; St Petersburg Academic University, Khlopin St 8/3 Let A, St Petersburg 194021, Russian Federation., Goray L; St Petersburg Academic University, Khlopin St 8/3 Let A, St Petersburg 194021, Russian Federation.
Source: Journal of synchrotron radiation [J Synchrotron Radiat] 2019 Sep 01; Vol. 26 (Pt 5), pp. 1539-1545. Date of Electronic Publication: 2019 Jul 19.
Publication Type: Journal Article
Language: English
Journal Info: Publisher: Wiley Online Library Country of Publication: United States NLM ID: 9888878 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1600-5775 (Electronic) Linking ISSN: 09090495 NLM ISO Abbreviation: J Synchrotron Radiat Subsets: PubMed not MEDLINE; MEDLINE
Imprint Name(s): Publication: [Malden, MA] : Wiley Online Library
Original Publication: Copenhagen : Wiley-Blackwell Munksgaard, c1994-
Abstract: A new design for a high-efficiency multilayer-coated blazed X-ray grating with horizontal-shifted (non-conformal) boundary profiles is proposed. The investigation of the grating design is carried out using an integrated approach based on rigorous numerical calculations of light diffraction by gratings with realistic boundary profiles obtained from simulations of multilayer grating growth. By varying the incidence angle of the deposition flux, one can set the direction and magnitude of the boundary profile shifts over a wide range of values. It is shown that the diffraction efficiency of the blazed gratings with shifted boundary profiles may be substantially higher than the efficiency of gratings with conformal boundaries, which are, moreover, much more difficult to produce. High-efficiency gratings with shifted boundaries can be obtained when the deposition is mainly on the blaze facet with a high inclination of the deposition flux, as opposed to widely used near-normal deposition methods. The maximum absolute efficiency of a W/B4C 2500 mm -1 grating with a blaze angle of 1.76° and an anti-blaze angle of 20°, working at a blaze wavelength of 1.3 nm and having shifted realistic boundary profiles, obtained using our integrated approach is 23.3%, while that of a grating with the ideal (triangular) boundary profile and the same shifts is 25.3%, and that of an ideal conformal profile is only 22.2%. The maximum absolute efficiency of 40.2% of a 2500 mm Cr/C grating with a blaze angle of 1.05° and a realistic anti-blaze angle of 10°, working at a blaze wavelength of 0.83 nm and having ideal shifted boundaries, is higher than the maximum efficiency of the similar grating having ideal conformal boundaries with a non-realistic anti-blaze angle of 80°.
Grant Information: 16-29-11697 Russian Foundation for Basic Research; 19-12-00270 Russian Science Foundation
Contributed Indexing: Keywords: diffraction efficiency; electromagnetic diffraction theory; grating efficiency; growth modeling; multilayer-coated blazed X-ray grating; multilayer-coated diffraction grating; soft X-ray range; thin-film growth simulations
Entry Date(s): Date Created: 20190907 Date Completed: 20190910 Latest Revision: 20190910
Update Code: 20250114
DOI: 10.1107/S1600577519006337
PMID: 31490141
Database: MEDLINE
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  Data: High-efficiency X-ray multilayer-coated blazed gratings with shifted boundaries.
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  Data: <searchLink fieldCode="AU" term="%22Lubov+M%22">Lubov M</searchLink>; St Petersburg Academic University, Khlopin St 8/3 Let A, St Petersburg 194021, Russian Federation.<br /><searchLink fieldCode="AU" term="%22Goray+L%22">Goray L</searchLink>; St Petersburg Academic University, Khlopin St 8/3 Let A, St Petersburg 194021, Russian Federation.
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  Data: <searchLink fieldCode="JN" term="%229888878%22">Journal of synchrotron radiation</searchLink> [J Synchrotron Radiat] 2019 Sep 01; Vol. 26 (Pt 5), pp. 1539-1545. <i>Date of Electronic Publication: </i>2019 Jul 19.
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22Wiley+Online+Library%22">Wiley Online Library </searchLink><i>Country of Publication: </i>United States <i>NLM ID: </i>9888878 <i>Publication Model: </i>Print-Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1600-5775 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%2209090495%22">09090495 </searchLink><i>NLM ISO Abbreviation: </i>J Synchrotron Radiat <i>Subsets: </i>PubMed not MEDLINE; MEDLINE
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  Data: <i>Publication</i>: [Malden, MA] : Wiley Online Library<br /><i>Original Publication</i>: Copenhagen : Wiley-Blackwell Munksgaard, c1994-
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A new design for a high-efficiency multilayer-coated blazed X-ray grating with horizontal-shifted (non-conformal) boundary profiles is proposed. The investigation of the grating design is carried out using an integrated approach based on rigorous numerical calculations of light diffraction by gratings with realistic boundary profiles obtained from simulations of multilayer grating growth. By varying the incidence angle of the deposition flux, one can set the direction and magnitude of the boundary profile shifts over a wide range of values. It is shown that the diffraction efficiency of the blazed gratings with shifted boundary profiles may be substantially higher than the efficiency of gratings with conformal boundaries, which are, moreover, much more difficult to produce. High-efficiency gratings with shifted boundaries can be obtained when the deposition is mainly on the blaze facet with a high inclination of the deposition flux, as opposed to widely used near-normal deposition methods. The maximum absolute efficiency of a W/B4C 2500 mm <superscript>-1</superscript> grating with a blaze angle of 1.76° and an anti-blaze angle of 20°, working at a blaze wavelength of 1.3 nm and having shifted realistic boundary profiles, obtained using our integrated approach is 23.3%, while that of a grating with the ideal (triangular) boundary profile and the same shifts is 25.3%, and that of an ideal conformal profile is only 22.2%. The maximum absolute efficiency of 40.2% of a 2500 mm Cr/C grating with a blaze angle of 1.05° and a realistic anti-blaze angle of 10°, working at a blaze wavelength of 0.83 nm and having ideal shifted boundaries, is higher than the maximum efficiency of the similar grating having ideal conformal boundaries with a non-realistic anti-blaze angle of 80°.
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  Data: 16-29-11697 Russian Foundation for Basic Research; 19-12-00270 Russian Science Foundation
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  Data: <i>Keywords: </i>diffraction efficiency; electromagnetic diffraction theory; grating efficiency; growth modeling; multilayer-coated blazed X-ray grating; multilayer-coated diffraction grating; soft X-ray range; thin-film growth simulations
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        Text: English
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            NameFull: Lubov M
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            NameFull: Goray L
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            – D: 01
              M: 09
              Text: 2019 Sep 01
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              Y: 2019
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              Value: 26
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