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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 66, Iss. 6 — Jun. 1, 1976
  • pp: 515–519

Single-layer, gradient refractive index antireflection films effective from 0.35 to 2.5 µ

Michael Jay Minot  »View Author Affiliations

JOSA, Vol. 66, Issue 6, pp. 515-519 (1976)

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Gradient refractive index antireflection films are produced by a chemical etch/leach process applied to glasses sensitized by a phase-separating heat treatment. The reflectance (two surfaces) is effectively reduced from ~ 8% to < ½% in the wavelength regime 0.35–2.5 µ. The broadband antireflection film consists of a single, porous, skeletal layer made up largely of silica. The optical properties of the film are shown to depend on the time, temperature parameters of the phase-separating heat treatment, as well as the time, temperature parameter of the film-forming etch/leach treatment. The properties of films produced under different process conditions are correlated in a fashion that suggests that progressively steeper refractive index gradients are obtained for samples phase separated and formed at higher temperatures. A number of applications for these films are suggested, including solar energy devices.

© 1976 Optical Society of America

Michael Jay Minot, "Single-layer, gradient refractive index antireflection films effective from 0.35 to 2.5 µ," J. Opt. Soc. Am. 66, 515-519 (1976)

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