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1 April 1998 Nonstandard diffraction structures for OVDs
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Proceedings Volume 3314, Optical Security and Counterfeit Deterrence Techniques II; (1998) https://doi.org/10.1117/12.304686
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States
Abstract
We have developed a palette of visual features based on non- standard diffraction structures, where the profile-shape and the profile depth are determining the intended effects. The target is to provide features with increased security inherent to the diffractive structures. Since the exact reconstruction of the profile is the basis of the effects, these features are very resilient against counterfeiting by standard holographic techniques. Three different types of grating structures and their use as security-feature are described.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rene Staub and Wayne Robert Tompkin "Nonstandard diffraction structures for OVDs", Proc. SPIE 3314, Optical Security and Counterfeit Deterrence Techniques II, (1 April 1998); https://doi.org/10.1117/12.304686
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