Optical safety component having a transmissive effect, manufacture of such a component, and secure document provided with such a component
US9744793B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 5, 2012 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | Nov 27, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D2035/36
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.