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Proceedings Paper

Optical memories for document security
Author(s): Wayne Robert Tompkin; Rene Staub; Jean-Frederic Moser
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Paper Abstract

We demonstrate the use of diffractive optical memories for official documents, such as machine-readable identity or fiduciary papers. Through engineering of the diffractive micro- structures, the direction and intensity distribution of the diffracted light can be tailored to optical memories for high security, uniqueness and unambiguous verification. The proposed optical memory is of the WORM-type, that is, write-once, read-many times. In order to write in the optical memory, the diffractive structure is changed irreversibly through the interaction of the diffractive surface with a beam of laser light. We demonstrate optical memories based on diffractive structures with a memory capacity of up to 100 kBits/cm2 which are appropriate for use in securing official documents.

Paper Details

Date Published: 15 March 1996
PDF: 8 pages
Proc. SPIE 2659, Optical Security and Counterfeit Deterrence Techniques, (15 March 1996); doi: 10.1117/12.235464
Show Author Affiliations
Wayne Robert Tompkin, Landis & Gyr Communications Corp. (Switzerland)
Rene Staub, Landis & Gyr Communications Corp. (Switzerland)
Jean-Frederic Moser, Landis & Gyr Communications Corp. (Switzerland)


Published in SPIE Proceedings Vol. 2659:
Optical Security and Counterfeit Deterrence Techniques
Rudolf L. van Renesse, Editor(s)

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