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Proceedings Paper

Zero-order gratings for optically variable devices
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Paper 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.

Paper Details

Date Published: 19 April 2002
PDF: 11 pages
Proc. SPIE 4677, Optical Security and Counterfeit Deterrence Techniques IV, (19 April 2002); doi: 10.1117/12.462714
Show Author Affiliations
Wayne Robert Tompkin, OVD Kinegram Corp. (Switzerland)
Andreas Schilling, OVD Kinegram Corp. (Switzerland)
Christophe Weiteneder, Univ. de Neuchatel (Switzerland)
Hans Peter Herzig, Univ. de Neuchatel (Switzerland)

Published in SPIE Proceedings Vol. 4677:
Optical Security and Counterfeit Deterrence Techniques IV
Rudolf L. van Renesse, Editor(s)

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