Machine-verifiable diffractive features for document security

Wayne Robert Tompkin; Rene Staub

doi:10.1117/12.304687

1 April 1998 Machine-verifiable diffractive features for document security

Wayne Robert Tompkin, Rene Staub

Proceedings Volume 3314, Optical Security and Counterfeit Deterrence Techniques II; (1998) https://doi.org/10.1117/12.304687
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

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 KINEGRAM^R.

Citation Download Citation

Wayne Robert Tompkin and Rene Staub "Machine-verifiable diffractive features for document security", Proc. SPIE 3314, Optical Security and Counterfeit Deterrence Techniques II, (1 April 1998); https://doi.org/10.1117/12.304687

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