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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 67, Iss. 8 — Aug. 1, 1977
  • pp: 1046–1050

The angluar reflectance of single-layer gradient refractive-index films

M. J. Minot  »View Author Affiliations


JOSA, Vol. 67, Issue 8, pp. 1046-1050 (1977)
http://dx.doi.org/10.1364/JOSA.67.001046


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Abstract

Normal incidence measurements of single-layer gradient refractive-index antireflection films, produced by a chemical etch-leach process on glass sensitized by a phase-separating heat treatment, indicate very low reflection over a broad wavelength regime, 0.35-2.5 µm. First-surface measurements of the reflectance of the gradient index films have now been made, in the visible regime, at off-normal incidence (to 70°) using polarized light. These measurements show that significant reflection reduction is obtained even at high angles of incidence—5.7% reflectance from the filmed glass at 70° compared to 16.4% for the unfilmed glass. Furthermore, although the films exhibit a weak wavelength dependence at high angles, they continue to be effective over a broad spectral region. The optical properties observed are in good agreement with computations based on a gradient refractive-index film with a step at the air-film interface. The optical properties of the film offer considerable advantage over conventional interference films in many applications.

© 1977 Optical Society of America

Citation
M. J. Minot, "The angluar reflectance of single-layer gradient refractive-index films," J. Opt. Soc. Am. 67, 1046-1050 (1977)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-67-8-1046

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