Abstract: According to a first aspect, the invention relates to an optical security component intended to be observed in reflection, with the naked eye, according to face of observation. It comprises a first layer made of dielectric material, having a first refractive index (n1), at least one first diffractive structure (S1, S2) etched on said first layer. The first diffractive structure comprises a first pattern with at least one set of modules disposed side-by-side, in a given direction (X) of arrangement, a maximum width (l) of each module defined in the direction of arrangement (X) being less than 300 ?m. Each module comprises a bas-relief with a first set of facets whose forms are determined to simulate an optical element visible in reflection, with at least one convex or concave region, said optical element having a profile with a continuously variable slope in a single direction (Y), said direction of variation of the slope, at right angles to the direction of arrangement (X).

Abstract: According to a first aspect, the invention relates to an optical security component intended to be observed in reflection, with the naked eye, according to face of observation. It comprises a first layer made of dielectric material, having a first refractive index (n1), at least one first diffractive structure (S1, S2) etched on said first layer. The first diffractive structure comprises a first pattern with at least one set of modules disposed side-by-side, in a given direction (X) of arrangement, a maximum width (l) of each module defined in the direction of arrangement (X) being less than 300 ?m. Each module comprises a bas-relief with a first set of facets whose forms are determined to simulate an optical element visible in reflection, with at least one convex or concave region, said optical element having a profile with a continuously variable slope in a single direction (Y), said direction of variation of the slope, at right angles to the direction of arrangement (X).

Abstract: A secure product, and a production method, comprising a first reflective layer, a second layer and a third layer including readable information, the first layer being enclosed between the second and the third layers, in which the first and second layers are transparent, at least a first part of the internal surface of the second layer comprises a diffusing microstructure, and the diffusing microstructure is positioned so as to cover a predetermined part of the readable information.

Abstract: According to one aspect, the invention relates to an optical security component intended for being observed under direct reflection. The component comprises a structure engraved on a layer of a material having a refraction index n2, a 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 no other than n1, encapsulating the coated structure of the thin layer.

Abstract: According to one aspect, the invention relates to a customizable document for producing a customized security document (10, 20).

Abstract: According to one aspect, the invention relates to an optical security component intended for being observed under direct reflection. The component comprises a structure engraved on a layer of a material having a refraction index n2, a 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 no other than n1, encapsulating the coated structure of the thin layer.

Abstract: According to one aspect, the invention relates to an optical security component intended for being observed under direct reflection. The component comprises a structure engraved on a layer of a material having a refraction index n2, a 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.

Abstract: According to one aspect, the invention relates to a customizable document for producing a customized security document (10, 20).

Abstract: According to one aspect, the invention relates to an optical security component (10) intended to be observed in a spectral band between 380 and 780 nm and in direct reflection mode, comprising: a layer of dielectric material (101), transparent in said observation spectral band, a continuous metallic layer (102) forming, with said layer of dielectric material, a metal-dielectric interface, having a sufficient thickness (t) to allow the reflection of the incident light on said interface in the observation spectral band with a maximum residual transmission as a function of the wavelength of 2%, and structured at said interface to form, in a first coupling area, two sets of undulations extending in two directions and forming a first grating with two dimensions, of subwavelength periods (?1, ?2) in each of the directions.

Abstract: According to one aspect, the invention relates to an optical security component intended for being observed under direct reflection. The component comprises a structure engraved on a layer of a material having a refraction index n2, a 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.

Abstract: According to one aspect, the invention relates to an optical safety component having a plasmonic effect intended to be observed by transmission, including two layers (101, 103) made of a transparent dielectric material, a metal layer (102) that is arranged between said layers made of dielectric material to form two dielectric-metal interfaces (105, 106), and is structured to form on at least a portion thereof corrugations (104) that are capable of coupling surface plasmon modes supported by said dielectric-metal interfaces with an incident light wave. The corrugations are arranged in a first coupling area in a first main direction and in at least one second coupling area separate from said first coupling area, in a second main direction that is substantially perpendicular to said first main direction, said metal layer being continuous on each one of said coupling areas.

Abstract: According to one aspect, the invention relates to an optical security component intended for being observed under direct reflection. The component comprises a structure engraved on a layer of a material having a refraction index n2, a 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.

Abstract: An optical security component intended to be checked in reflection in a checking spectral band includes a layer that is reflective in the checking spectral band. The layer exhibits a structured zone that includes microstructures distributed spatially in a uniform manner over a whole of the structured zone so as to form an optical structure that is at least partially scattering in the checking spectral band. The microstructures have heights that are distributed according to a random function, modulated over the structured zone by a modulation function so as to form, after illumination of the optical security component at a given angle, an image identifiable by observation in reflection.

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: An optical security component intended to be checked in reflection in a checking spectral band includes a layer that is reflective in the checking spectral band. The layer exhibits a structured zone that includes microstructures distributed spatially in a uniform manner over a whole of the structured zone so as to form an optical structure that is at least partially scattering in the checking spectral band. The microstructures have heights that are distributed according to a random function, modulated over the structured zone by a modulation function so as to form, after illumination of the optical security component at a given angle, an image identifiable by observation in reflection.

Abstract: According to one aspect, the invention relates to an optical security component (10) intended to be observed in a spectral band between 380 and 780 nm and in direct reflection mode, comprising: a layer of dielectric material (101), transparent in said observation spectral band, a continuous metallic layer (102) forming, with said layer of dielectric material, a metal-dielectric interface, having a sufficient thickness (t) to allow the reflection of the incident light on said interface in the observation spectral band with a maximum residual transmission as a function of the wavelength of 2%, and structured at said interface to form, in a first coupling area, two sets of undulations extending in two directions and forming a first grating with two dimensions, of subwavelength periods (?1, ?2) in each of the directions.

Abstract: One aspect of the invention relates to an optical security component (10) comprising at least one diffractive element (7) formed by at least one annular diffractive grating (111, 113, 115, 117, 131, 133, 135) characterized by a minimum radius (Rmin), a maximum radius (Rmax) and a period (d). According to the invention, using a polychromatic light-emitting object, the aforementioned diffractive element can form a plurality of images at different observation distances from the component, the spectral characteristics of said images varying as a function of the observation distance from the component.

Abstract: According to one aspect, the invention relates to an optical safety component having a plasmonic effect intended to be observed by transmission, including two layers (101, 103) made of a transparent dielectric material, a metal layer (102) that is arranged between said layers made of dielectric material to form two dielectric-metal interfaces (105, 106), and is structured to form on at least a portion thereof corrugations (104) that are capable of coupling surface plasmon modes supported by said dielectric-metal interfaces with an incident light wave. The corrugations are arranged in a first coupling area in a first main direction and in at least one second coupling area separate from said first coupling area, in a second main direction that is substantially perpendicular to said first main direction, said metal layer being continuous on each one of said coupling areas.

Abstract: A secure product, and a production method, comprising a first reflective layer, a second layer and a third layer including readable information, the first layer being enclosed between the second and the third layers, in which the first and second layers are transparent, at least a first part of the internal surface of the second layer comprises a diffusing microstructure, and the diffusing microstructure is positioned so as to cover a predetermined part of the readable information.

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.