Tungsten/boron nitride multilayers for X-UV optical applications

Pierre Boher, Louis Hennet, Fabrice Pierre, David J. Smith, A. Modak, M. Idir, R. Barchewitz

    Research output: Contribution to journalConference articlepeer-review


    WjBN multilayers are theoretically efficient X-ray mirrors at the nitrogen and boron K-α lines (31.3 Å and 67.6 Å respectively). Their most attractive potential application is detection of light elements by X-ray fluorescence spectrometry. The performances of W/BN mirrors depend not only on the structural quality of the multilayers but also on the stoichiometry of the boron nitride layers, especially in the water window (20-40 Å). In order to get stoichiometric BN layers with low surface roughness, the deposition of thick boron nitride films has been studied in details. In-situ kinetic ellipsometry, X-ray pholoemission, grazing X-ray reflection and scanning electron microscopy show that quasi-stoichiometric BN films with low surface roughness are obtained only with a low total deposition pressure and an additional nitrogen partial pressure. This result is related to the chemical and structural properties of the BN films. W/BN multilayers with medium period value (2d ≃ 120 Å) show about 80% of the maximum reflectivity at the W M45 line. When the period is reduced the performances are reduced but good quality W/BN multilayers with very low period values (2d ≃ 50 Å) and a great number of periods (> 100) have been fabricated. The best structural quality is obtained when a low nitrogen partial pressure is introduced during the deposition of the BN layers. The optical indice contrast is improved and the tungsten-boron interdiffusion is reduced.

    Original languageEnglish (US)
    Pages (from-to)520-536
    Number of pages17
    JournalProceedings of SPIE - The International Society for Optical Engineering
    StatePublished - Jan 1 1992
    EventMultilayer and Grazing Incidence X-Ray/EUV Optics 1991 - San Diego, United States
    Duration: Jul 21 1991 → …

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering


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