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Volume 125, 2004
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Optical properties of nanostructured metal films

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Abstract

Nanostructured metal films of platinum, gold and silver up to 675 nm thick we prepared by electrochemical deposition through templates of 700 nm diameter polystyrene spheres assembled as hexagonal close packed monolayer on an evaporated gold surface followed by removal of the template by dissolution in tetrahydrofuran. The reflection spectra of the films at normal incidence were recorded as a function of film thickness and the spectra correlated with the local visual appearance of the film and the surface structure from SEM. For thin films, below one quarter sphere height, the spectra show a single reflectivity dip at a wavelength just below the sphere diameter consistent with surface-plasmon grating-like behaviour. For the thicker films several reflectivity dips are observed which move towards longer wavelength with increasing film thickness. This behaviour is shown to be consistent with a model in which light reflected from the top of the structure interferes with light reflected from within the spherical segment cavities in the film.

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Publication details

The article was received on 14 Apr 2003, accepted on 19 May 2003 and first published on 31 Jul 2003


Article type: Paper
DOI: 10.1039/B304116F
Citation: Faraday Discuss., 2004,125, 117-132
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    Optical properties of nanostructured metal films

    P. N. Bartlett, J. J. Baumberg, S. Coyle and M. E. Abdelsalam, Faraday Discuss., 2004, 125, 117
    DOI: 10.1039/B304116F

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