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Proceedings Article

Zero-order gratings for optically variable devices

[+] Author Affiliations
Wayne R. Tompkin, Andreas Schilling

OVD Kinegram Corp. (Switzerland)

Christophe Weiteneder, Hans Peter Herzig

Univ. de Neuchatel (Switzerland)

Proc. SPIE 4677, Optical Security and Counterfeit Deterrence Techniques IV, 227 (April 18, 2002); doi:10.1117/12.462714
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From Conference Volume 4677

  • Optical Security and Counterfeit Deterrence Techniques IV
  • Rudolf L. van Renesse
  • San Jose, CA | January 19, 2002

abstract

We present the results of the application of zero-order diffraction gratings for optical variable devices (OVD's) for document security. Zero-order gratings have periods which are smaller than the wavelength of light; to describe accurately the optical properties of the zero-order gratings, we have applied rigorous electromagnetic theory, which we have compared to experimental measurements. We studied the diffractive behavior of zero-order grating varies locally in a predetermined manner. In the latter case, the resulting surface profile can exhibit variations in the diffraction properties, for example, a moire pattern. Furthermore, we have developed diffractive surface-reliefs which are a combination of a high-frequency, zero-order grating with large-period gratings, the addition of the zero-order grating to a large-period grating results in a surface relief with novel diffractive properties.

© (2002) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Wayne R. Tompkin ; Andreas Schilling ; Christophe Weiteneder and Hans Peter Herzig
"Zero-order gratings for optically variable devices", Proc. SPIE 4677, Optical Security and Counterfeit Deterrence Techniques IV, 227 (April 18, 2002); doi:10.1117/12.462714; http://dx.doi.org/10.1117/12.462714


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