Advanced optical document security element

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F12%3A00203807" target="_blank" >RIV/68407700:21340/12:00203807 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1117/12.2006042" target="_blank" >http://dx.doi.org/10.1117/12.2006042</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1117/12.2006042" target="_blank" >10.1117/12.2006042</a>

Result language
angličtina
Original language name
Advanced optical document security element
Original language description
Synthetic diffractive structures represent an important tool in the optical document security. Their macroscopic visual behavior is based on properties of a very fine micro-structure which cannot be copied using common copying techniques. The visual effects can be easily observed by a common observer without any special inspection tools. However, when a high level of security is needed, additional features are often included based on an optical encryption of information. In this paper, a novel encryption technique is presented, which is based on utilizing the plastic holographic foil as a waveguide and special diffractive structures as coupling elements. When an in-coupling area is illuminated with a defined light beam, the light is coupled into the waveguide and travels to an out-coupling part. The encrypted information is encoded either in the shape of the out-coupling area or it can be formed from an out-coupling hologram in free space above the element. Both laser and normal white
Czech name
—
Czech description
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Project
<a href="/en/project/KAN401220801" target="_blank" >KAN401220801: Nanostructures of Controlled Size and Dimensions</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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