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

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

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
Volume178
Issue numberC
DOIs
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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    Simmons, J. H., Pagano, S. J., Downie, L. K., Potter, B. G., Simmons, C. J., Boulos, E. N., & Best, M. F. (1994). Graded-index AR coatings for large angles of inclination. Journal of Non-Crystalline Solids, 178(C), 166-175. https://doi.org/10.1016/0022-3093(94)90281-X