PROTECTIVE DEVICE BASED ON ZERO-ORDER DIFFRACTIVE STRUCTURES Russian patent published in 2023 - IPC G02B5/18 B42D25/328 

FIELD: protection of documents.

SUBSTANCE: invention relates to the field of protection against forgery of valuable documents and relates to a multilayer security device. The protective device contains a thin-film optically transparent in the visible region of the spectrum waveguide dielectric layer, the surface of which is pattern-relief structured in the form of a zero-order diffraction-lattice microstructure (ZODMS), and also includes a family of other surface-relief microimages other than ZODMS. On both sides, thin-film polymeric transparent coatings are applied. At least one of the thin-film polymer layers is made of an anisotropic material with luminophores introduced into at least one of them at the molecular level, transparent in the visible region of the spectrum, but absorbing in the UV region and forming hidden anisotropic protective features in the form of luminescent images, visualized as dynamically changing in color and spatial configuration of the glow when changing the inclined or rotational orientation of the protective element, as well as the state of polarization of the radiation absorbed and re-emitted by the luminophores.

EFFECT: improved protective properties of the device.

12 cl, 8 dwg