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Proceedings Paper

Machine-verifiable diffractive features for document security
Author(s): Wayne Robert Tompkin; Rene Staub
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Paper Abstract

We demonstrate the use of diffractive surface-relief profiles for the machine verification of official documents. The microstructures are engineered to yield a prescribed intensity distribution of the diffracted light which can be measured to insure unambiguous verification and authentication. We have developed a palette of machine-verifiable features, offering various capacities of information, ranging from a feature which is easily verified through visual inspection using a special aid, to a feature capable of representing hundreds of bits of information in a read-only diffractive optical memory. The proposed features which we will present here are the hidden-information features, the diffractive area code and the diffractive linear code. For each of the three proposed features, we present prototype systems demonstrating the use of machine-verifiable diffractive optical features incorporated into optically variable devices (OVDs) for document security. Specially engineered diffractive structures are used which are extremely resilient against counterfeit, reorigination or imitation. The machine-readable feature is combined with a visual security device, such as the products known under the tradename KINEGRAMR.

Paper Details

Date Published: 1 April 1998
PDF: 11 pages
Proc. SPIE 3314, Optical Security and Counterfeit Deterrence Techniques II, (1 April 1998); doi: 10.1117/12.304687
Show Author Affiliations
Wayne Robert Tompkin, Landis & Gyr Communications Corp. (Switzerland)
Rene Staub, Landis & Gyr Communications Corp. (Switzerland)


Published in SPIE Proceedings Vol. 3314:
Optical Security and Counterfeit Deterrence Techniques II
Rudolf L. van Renesse, Editor(s)

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