Abstract
Preparation technology, optical properties and surface-enhanced photoluminescence features of thin Ag/Bi layers with different ratios of the chemical elements are subject of present work. Coatings with different number of Ag/Bi stacks were tested in order to determine the minimum number of sublayers required to achieve epsilon-near-zero properties (ENZ). The results for the complex permittivity showed that the Ag/Bi films possess epsilon-near-zero properties in a wide spectral range of 1.3-6 eV. It was established that the most promising material for photoluminescence signal amplification is the four stacked Ag50:Bi50 thin layer.
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