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The Bruggeman effective medium is used to study the transition to hyperbolic dispersion of visible light in thin-film metal-dielectric composite metamaterial of varying mixing proportion. This transition is experimentally demonstrated by the detection of the swap between the refracted birefringence components in fabricated composites of silver nanowires embedded in anodic aluminium oxide. Three refraction regimes are observed in a single composite using excitation radiation on both sides of the transition.
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Custodio et al. (2012) studied this question.
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