Spectral density analysis of thin gold films: Thickness and structure dependence of the optical properties
2013 (English)In: Proceedings, ISSN 0351-6067, 443-447 p.Article, book review (Other academic) Published
In this paper we study the feasibility of representing the optical properties of ultrathin gold films by effective medium theories. Gold films with mass thicknesses in the range of 1.4 to 9.2 nm were deposited by DC magnetron sputtering onto non-heated glass substrates. Optical measurements in the range 0.25 to 2 µm were carried out by spectroscopic ellipsometry, and the effective complex dielectric function of each film was determined. The gold films were modelled as a mixture of gold and air, and a general effective medium description using the spectral density function (SDF) was used to describe their optical properties. Numerical inversion of the experimental dielectric function gave a broad and rather featureless SDF with a few superimposed peak structures, both for island structures and percolating films. The broad background is qualitatively similar to the predictions of the Bruggeman [Ann. Phys. (Leipzig), 5th series, 24 (1935) 636-679] model.
Place, publisher, year, edition, pages
Stockholm, 2013. 443-447 p.
Au thin films, ellipsometry, dielectric function, effective medium theory, spectral density function.
IdentifiersURN: urn:nbn:se:liu:diva-103353OAI: oai:DiVA.org:liu-103353DiVA: diva2:688672
Progress In Electromagnetics Research Symposium Proceedings, Stockholm, Sweden, Aug. 12-15, 2013