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Abstract
In this work islandised nickel films have been placed in a symmetric environment to allow optical excitation of long-range surface modes via attenuated total reflection. Comparison of modelling theory to the experimental angle-dependent reflectivity data shows that it is not possible to determine the optical permittivity of the thin nickel layer without knowledge of its thickness. The reflectivity data has a set of degenerate fits; the deduced optical permittivities for this degeneracy describing a circle when plotted as a Cole-Cole plot. This circle is naively predicted from an analytical three-media theory which ignores the coupling prism. Moreover, further investigations show that the degenerate circle is a general result of fitting reflectivity curves in the vicinity of a long range mode.
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