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Proceedings Paper

Color-shifting features for optically variable devices
Author(s): Wayne Robert Tompkin; Andreas Schilling; Rene Staub
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Paper Abstract

The simultaneous engineering of diffractive structures and amterial systems enables innovative appraoches for realizing iridescent color shifts for Optically Variable Devices (OVDs) for document secrity. In a first exmaple, we dmonstrate the interplay between a color-shifting coating, whichfunctions inreflection,a nd embossed gratings,w ith effects inthe first and hgher diffraction orders. In a second exmpale, we demosntrate novel surface-releif, zero-order gratingw hich show a color shift, e.g. green to red, uponrotation by 90 degrees. In a third example, we explore the use of combination gratings to realize color-shifting and color-contrast features. These color-shifting features are integrated within OVD designs in which an observer can easily check the behavior of the feature and verify the authenticity of the document.

Paper Details

Date Published: 3 June 2004
PDF: 12 pages
Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); doi: 10.1117/12.527571
Show Author Affiliations
Wayne Robert Tompkin, OVD Kinegram Corp. (Switzerland)
Andreas Schilling, OVD Kinegram Corp. (Switzerland)
Rene Staub, OVD Kinegram Corp. (Switzerland)

Published in SPIE Proceedings Vol. 5310:
Optical Security and Counterfeit Deterrence Techniques V
Rudolf L. van Renesse, Editor(s)

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