15 March 1996 Optical memories for document security
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Wayne Robert Tompkin, Rene Staub, Jean-Frederic Moser, "Optical memories for document security", Proc. SPIE 2659, Optical Security and Counterfeit Deterrence Techniques, (15 March 1996); doi: 10.1117/12.235464; https://doi.org/10.1117/12.235464

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