Organic nanostructured layers (ONL's) deposited on glass exhibit a low effective refractive index which can be tuned down to approximately 1.1. Broadband antireflective (AR) coatings were developed by combining inorganic materials and ONL's in such a way that the effective refractive index decreases from the substrate to that of air. AR coatings with ONL as outermost layer suffer on its bad mechanical properties. In contrast to that, an AR coating with an ONL embedded in a thick silica layer showed a promising mechanical stability.
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