Anti-reflection nano-metric structure based on anodised porous alumina and method for production thereof

摘要

A substrate made of transparent material (2) having a surface presenting a regular and orderly distribution of reliefs (12) or cavities (15) of nanometric dimensions is obtained with a method including the depositing of a layer of aluminium (6) on the substrate made of transparent material (2), and subsequent operations of anodization of the aluminium in order to obtain an alumina structure with an orderly distribution of pores (4) according to a pattern that is transferred onto the surface of the transparent substrate. The alumina can be used as sacrificial layer or else can remain as forming an integral part of the finished product. The method is performed in such a way as to obtain cavities or reliefs sized and arranged so as to bestow upon the transparent substrate anti-reflection properties, so as to increase the percentage of radiation transmitted by the transparent substrate at the wavelengths at which said anti-reflection properties are manifested. Alternatively, the method is carried out on a metal substrate, which is then used for the moulding of the transparent substrate.