Optical security components, manufacture of such components and secure objects equipped with such components

Abstract

The invention relates to an optical security component (201) comprising a first layer (213) of dielectric material, at least one first diffractive structure (S) etched on said first layer, a second layer (214) at least partially covering said first diffractive structure, and having a spectral band of reflection in the visible. The first diffractive structure comprises a set of facets (220) each having a slope of fixed angular value and a crest line (225), the facets being determined to generate for example a surface appearing three-dimensionally to an observer. Each facet of the set of facets is structured by a subwavelength diffraction grating (230) configured to produce, after deposition of the second layer, a colored effect.The diffraction gratings that structure the facets of the facet set include at least one variable property depending on the orientation of the ridge line and / or the angular value of the facet slope. Fig. 2A.

Images