7 April 2000 Self-referencing diffractive features for OVDs
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We will show various diffractive features which are easy to verify and highly secure against attempts to counterfeit. These features are based on engineered surface relief structures which allow one to tailor the diffraction properties to obtain the desired effects. The security is based on complex diffraction structures rather than on complex image content, allowing the realization of relative simple feature designs, which are favorable from an ergonomic point of view. The unique properties of the engineered diffraction structures can be visualized, if an appropriate reference is provided, against which the observer can compare. We follow the idea that the optical effects in a well designed security feature must be interdependent in the sense of coherence or self- referencing. Various examples are presented, showing unique self-referencing first-line security features for document applications, which are clearly recognizable and easy to communicate. The presented effects are resilient against attempts to counterfeit by holographic techniques.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rene Staub, Rene Staub, Wayne Robert Tompkin, Wayne Robert Tompkin, } "Self-referencing diffractive features for OVDs", Proc. SPIE 3973, Optical Security and Counterfeit Deterrence Techniques III, (7 April 2000); doi: 10.1117/12.382190; https://doi.org/10.1117/12.382190


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