OPTICAL SECURITY COMPONENT HAVING A REFLECTIVE EFFECT, MANUFACTURE OF SAID COMPONENT, AND SECURED DOCUMENT PROVIDED WITH SUCH A COMPONENT

摘要

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 (Λ1, Λ2) in each of the directions.

主权项

1. An optical security component observable in a spectral band between 380 and 780 nm and in direct reflection mode, comprising:
a layer of dielectric material, transparent in said observation spectral band; and a continuous metallic layer forming, with said layer of dielectric material, a metal-dielectric interface, having a sufficient thickness 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 coupling grating with two dimensions, of subwavelength periods in each of the directions.