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

doi:10.1016/0022-3093(94)90281-X

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 journal › Article › peer-review

4 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 language	English (US)
Pages (from-to)	166-175
Number of pages	10
Journal	Journal of Non-Crystalline Solids
Volume	178
Issue number	C
DOIs	https://doi.org/10.1016/0022-3093(94)90281-X
State	Published - Nov 3 1994
Externally published	Yes

ASJC Scopus subject areas

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

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10.1016/0022-3093(94)90281-X

Cite this

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title = "Graded-index AR coatings for large angles of inclination",

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.",

author = "Simmons, {J. H.} and Pagano, {S. J.} and Downie, {L. K.} and Potter, {B. G.} and Simmons, {C. J.} and Boulos, {E. N.} and Best, {M. F.}",

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T1 - Graded-index AR coatings for large angles of inclination

AU - Simmons, J. H.

AU - Pagano, S. J.

AU - Downie, L. K.

AU - Potter, B. G.

AU - Simmons, C. J.

AU - Boulos, E. N.

AU - Best, M. F.

PY - 1994/11/3

Y1 - 1994/11/3

N2 - 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.

AB - 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.

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Graded-index AR coatings for large angles of inclination

Abstract

ASJC Scopus subject areas

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