SECURITY ELEMENT HAVING A SUBWAVELENGTH GRATING
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Jul 14, 2015
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Jul 21, 2014
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A security element for manufacturing value documents has a dielectric substrate embedded in the substrate a first line grating structure of first grating ridges made of highly refractive dielectric or semi-metallic material, and a second line grating structure of second grating ridges, made of highly refractive dielectric or semi-metallic material, running along the longitudinal direction. The first grating ridges have respectively a first thickness, and the second line grating structure. The security element generates a color effect in transmissive viewing, and the first and the second thickness amount to at least 100 nm.
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