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Proceedings Paper

Synergy of moiré principles and diffraction by periodic structures in optical devices for document security
Author(s): Ivo Aubrecht
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Paper Abstract

Recording of periodic structures is employed, instead of printing techniques, for moiré pattern to be generated. Diffraction gratings are utilized not only as substitutes of printing inks here but also to employ variation of visual appearance for revealing information encoded in a data-carrier structure. Two designs are analysed - one relying on very precise alignment of a decoding overlay grid and the other one allowing the use of the decoding grid to be avoided. The latter design is found more suitable to serve as an authentication element at first-line inspection.

Paper Details

Date Published: 11 May 2011
PDF: 8 pages
Proc. SPIE 8074, Holography: Advances and Modern Trends II, 807409 (11 May 2011); doi: 10.1117/12.886257
Show Author Affiliations
Ivo Aubrecht, Police Presidium CR (Czech Republic)

Published in SPIE Proceedings Vol. 8074:
Holography: Advances and Modern Trends II
Miroslav Hrabovský; Miroslav Miler; John T. Sheridan, Editor(s)

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