Antireflection coatings including scattered objects having two separate ranges with separate refraction indices

A method for treating a surface of a substrate with which anti-reflection properties toward an electromagnetic radiation may be imparted to this surface, wherein a transparent coating toward said electromagnetic radiation is deposited on said surface, which contains in the dispersed condition within said layer objects with dimensions of less than 5 microns, preferably less than 2 microns, said objects comprising at least two areas consisting of transparent substrates toward said electromagnetic radiation and have distinct refractive indexes, i,e.:

• a core having a first refraction index cC, and
• a layer, a so-called skin, surrounding the core, having a second refractive index nE, distinct from the refraction index nC of the core,
• wherein the ratio of the dimensions of the core to the dimensions of the core/skin assembly is comprised between 1:1.5 and 1:5.