Abstract

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

Hysteretic characteristics of 1/λ⁴ scattering of light during adsorption and desorption of water in porous Vycor glass with nanopores

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Analysis of nanostructured porous films by measurement of adsorption isotherms with optical fiber and ellipsometry

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1/λ⁴ scattering of light during the drying process in porous Vycor glass with nano-sized pores

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What is Vycor glass?

Appl. Opt. 18(19) 3208-3248 (1979)