Graded-index AR coatings for large angles of inclination

J. H. Simmons, S. J. Pagano, L. K. Downie, B. G. Potter, C. J. Simmons, E. N. Boulos, M. F. Best

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4 Scopus citations


Antireflective coatings consisting of a single layer of glass with a graded variation in refractive index offer advantages over multi-layer coatings. These include a weaker dependence on angle of incidence at large angles and a flatter response to different wavelenghts over the visible. Consequently, graded-index films are desirable in automotive applications where colorless coatings are required. A sol-gel process is presented for the formation of a graded-index coating of MgOSiO2 with in-diffused fluorine. Refractive index variations over a range 1.46-1.40 are achieved over a few hundred micrometers. A theoretical analysis of the angular and wavelength dependence of the reflectivity of uncoated, single-layer coated, triple-layer coated and graded-index-layer coated samples was performed and compared with experimentally derived films. Good agreement between model and experiment was observed.

Original languageEnglish (US)
Pages (from-to)166-175
Number of pages10
JournalJournal of Non-Crystalline Solids
Issue numberC
StatePublished - Nov 3 1994
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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