Abstract: An optical authentication component visible in reflection having a structure imprinted on a substrate of index n0, a thin layer, made of a dielectric material having a refractive index n1, deposited on the structure, and a layer made of a material having an index n2 similar to n0, encapsulating the structure coated with the thin layer, is disclosed. The structure has a first pattern modulated by a second pattern, the first pattern is a bas-relief with an array of facets, having shapes which are defined to simulate an image in relief of an object in relief, and the second pattern is a periodic grating that modulates the first pattern which produces, after the thin layer has been deposited and the structure has been encapsulated, a first color at a first viewing angle and a different second color at a second viewing angle, obtained by azimuthal rotation of the component.

Abstract: The present invention discloses a pixelated optical filter comprising high-index refraction material positioned between low-index-refraction matter. At least some of the high-index refraction material has a grated structure and lateral and vertical dimensions with respect to the low-index-refraction matter such that the high-index refraction material is operative to act as a leaky waveguide for light incident on the pixelated optical filter. The grated structure comprises a plurality of at least one grating pattern that is planarly bounded. Each of the plurality of at least one grating pattern constitutes a subpixel. A plurality of subpixels is operative to diffract incident light to at least one zero-order wavelength spectrum respective of the at least one grating pattern. Additional and alternative embodiments are disclosed and claimed.

Abstract: The present invention relates to an optical security marking component producing a first visible configuration when observed through a polarizer oriented in a first orientation, and a second configuration, separate from the first, visible when observed through the polarizer oriented in a second orientation, the optical component comprising a stamped film for forming at least two diffraction gratings having different orientations, characterized in that each of said gratings has a period of less than 550 nm and a modulation between 0.25 and 0.5 relative to a reference plane.