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Optical Engineering

Low-density diffractive optical memories for document security
Author(s): Wayne Robert Tompkin; Rene Staub
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Paper Abstract

A low-density diffractive optical write-once, read multiple times memory (WORM) is demonstrated that authenticates and secures documents. Furthermore, by encoding the machine-readable optical code, information can be linked to the document. The proposed solution leads to a reliable, high security machine-readable information carrier that is fully compatible with the requirements of typical security documents, such as payment substrates, fiduciary papers, passports, and identity cards. The information carrier is a juxtaposition of diffractive structures. Data are written permanently in an optical memory; the diffractive structure is changed irreversibly through the interaction of a diffractive surface with a beam of laser light. A prototype low-density optical memory based on diffractive structures that are resilient against copying or reorigination is realized for use in securing official travel documents.

Paper Details

Date Published: 1 September 1996
PDF: 6 pages
Opt. Eng. 35(9) doi: 10.1117/1.600855
Published in: Optical Engineering Volume 35, Issue 9
Show Author Affiliations
Wayne Robert Tompkin, Landis & Gyr Communications Corp. (Switzerland)
Rene Staub, Landis & Gyr Communications Corp. (Switzerland)

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