Optical security component having a reflective effect, manufacture of said component, and secured document provided with such a component
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United States of America Patent
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Feb 6, 2018
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app pub date -
Oct 26, 2012
filing date -
Oct 28, 2011
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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 (Λ1, Λ2) in each of the directions.
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