FIELD: books, newspapers and similar materials.
SUBSTANCE: invention relates to an optical security component intended for being observed under direct reflection. Component comprises a structure engraved on a layer of a material having a refraction index n2, thin layer of a dielectric material having a refraction index n1 other than n2, deposited on the structure, and a layer of a material having a refraction index n0 other than n1, encapsulating the coated structure of the thin layer. Structure has a first pattern modulated by a second pattern such that, in at least one first region, the first pattern comprises a low-relief with a first set of facets, shapes of which are determined such as to generate at least one first concave or convex cylindrical reflective element, and the second pattern forms a first subwavelength grating acting, after depositing the thin layer and encapsulating the structure, as a first wavelength-subtractive filter; in at least one second region, the first pattern comprises a low-relief with a second set of facets in which the shapes are determined such as to generate at least one concave or convex cylindrical reflective element, and the second pattern forms a second subwavelength grating acting, after depositing the thin layer and encapsulating the structure, as a second wavelength-subtractive filter, separate from the first wavelength-subtractive filter.
EFFECT: each subwavelength grating can be a zero order diffraction grating such as a DID.
19 cl, 10 dwg
