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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 28 — Oct. 1, 2000
  • pp: 5214–5220

Study of Tarnished Films Formed on Silver by Exposure to H2S with the Surface-Plasmon Resonance Technique

Navina Mehan and Abhai Mansingh  »View Author Affiliations


Applied Optics, Vol. 39, Issue 28, pp. 5214-5220 (2000)
http://dx.doi.org/10.1364/AO.39.005214


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Abstract

The surface-plasmon resonance (SPR) technique is used to study the growth rate and the nature of Ag<sub>2</sub>S films formed on a silver (Ag) film exposed to an atmosphere containing 50% H<sub>2</sub>S for different times. The thickness of the Ag<sub>2</sub>S layer formed, estimated from shifts in the experimental SPR curves, showed a saturation tendency after an initial linear increase. Theoretical analysis of the curves when Ag and Ag<sub>2</sub>S are treated as two uniform layers and Ag–Ag<sub>2</sub>S as a composite layer showed that radiation damping is mainly responsible for the increase of half-width and dip reflectance, indicating that the Ag<sub>2</sub>S film formed is rough and discontinuous.

© 2000 Optical Society of America

OCIS Codes
(240.0310) Optics at surfaces : Thin films
(240.5770) Optics at surfaces : Roughness
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(310.6860) Thin films : Thin films, optical properties
(310.6870) Thin films : Thin films, other properties

Citation
Navina Mehan and Abhai Mansingh, "Study of Tarnished Films Formed on Silver by Exposure to H2S with the Surface-Plasmon Resonance Technique," Appl. Opt. 39, 5214-5220 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-28-5214


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References

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