  We report on design and fabrication of nano-composite metal-dielectric thin
film coatings with high reflectance asymmetries. Applying basic dispersion
engineering principles to model a broadband and large reflectance asymmetry, we
obtain a model dielectric function for the metamaterial film, closely
resembling the effective permittivity of disordered metal-dielectric
nano-composites. Coatings realized using disordered nanocrystalline silver
films deposited on glass substrates confirm the theoretical predictions,
exhibiting symmetric transmittance, large reflectance asymmetries and a unique
flat reflectance asymmetry.
