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Applied Optics

Applied Optics


  • Vol. 40, Iss. 4 — Feb. 1, 2001
  • pp: 527–532

Adsorption of water on porous Vycor glass studied by ellipsometry

Alberto Álvarez-Herrero, Raquel L. Heredero, Eusebio Bernabeu, and David Levy  »View Author Affiliations

Applied Optics, Vol. 40, Issue 4, pp. 527-532 (2001)

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The variation of the optical properties of porous Vycor glass (Corning, Model 7930) under different relative-humidity conditions was studied. The adsorption of water into the glass pores was investigated with spectroscopic ellipsometry. The change of the refractive index was Δn ∼ 0.04 between 5% and 90% relative humidity. A linear relation between the ellipsometer parameter tan Ψ, the amount of water adsorbed in the glass pores, and information about the pore-size distributions was established. The results are in accord with the values obtained from N2 isotherms, transmission electron microscope micrographs, and the manufacturer’s specifications (radius of ∼20 Å). The possibility of using this material as a transducer for implementation in a fiber-optic sensor to measure humidity was evaluated.

© 2001 Optical Society of America

OCIS Codes
(010.7340) Atmospheric and oceanic optics : Water
(120.2130) Instrumentation, measurement, and metrology : Ellipsometry and polarimetry
(160.4760) Materials : Optical properties
(160.6030) Materials : Silica

Original Manuscript: June 22, 2000
Revised Manuscript: October 30, 2000
Published: February 1, 2001

Alberto Álvarez-Herrero, Raquel L. Heredero, Eusebio Bernabeu, and David Levy, "Adsorption of water on porous Vycor glass studied by ellipsometry," Appl. Opt. 40, 527-532 (2001)

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