Optical security mark comprising metamaterials with a magnetic response, authentication method using said mark, and use of said mark applied to an object
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United States of America Patent
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Apr 9, 2013
Grant Date -
Jan 26, 2012
app pub date -
Mar 26, 2010
filing date -
Mar 27, 2009
priority date (Note) -
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Abstract
The invention relates to an optical security mark that can be applied to an object, said mark comprising a structure made of a metamaterial that generates a magnetic response to incident radiation having a wavelength (λ) corresponding to a specific code of formula μr(λ) where μr is the relative magnetic permeability of the metamaterial and λ is a wavelength of the incident radiation having a value of between 15 nm and 1100 nm, or a specific code of formula λ(μr) or combinations of said codes. Said mark has a first tranverse dimension bx in a first transverse extension of the metamaterial and a second transverse dimension by in a second transverse extension of the metamaterial, different from the first transversal dimension, the first transverse dimension and the second transverse dimension each being at least equal to the wavelength (λ) of the incident radiation.
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