Abstract
The growth and concomitant evolution of the optical properties of Ag nano-clustersdeposited on biaxially extruded poly(ethylene terephthalate) films is studied by reflectancedifference spectroscopy. It is demonstrated by low energy ion scattering and simulatedoptical spectra that the clusters form a two-dimensional layer buried beneath the surface ofthe substrate. The experimental spectra are described by simulations in which differentconfigurations of the host such as anisotropy, amorphization, and dilution areconsidered in an effective medium approach. The contribution of the anisotropicsubstrate is used to explain the resulting line shapes. We also discuss the roleof the rate of change of the filling fraction with Ag coverage in the evolutionof the spectra and the detection of the onset of coalescence by optical means.
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