Color-shifting features for optically variable devices

Wayne Robert Tompkin; Andreas Schilling; Rene Staub

doi:10.1117/12.527571

3 June 2004 Color-shifting features for optically variable devices

Wayne Robert Tompkin, Andreas Schilling, Rene Staub

Proceedings Volume 5310, Optical Security and Counterfeit Deterrence Techniques V; (2004) https://doi.org/10.1117/12.527571
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

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.

Citation Download Citation

Wayne Robert Tompkin, Andreas Schilling, and Rene Staub "Color-shifting features for optically variable devices", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); https://doi.org/10.1117/12.527571

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