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Proceedings Paper

Multifunctional optical security features based on bacteriorhodopsin
Author(s): Norbert A. Hampp; Martin Neebe; Thorsten Juchem; Markus Wolperdinger; Markus Geiger; Arno Schmuck
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Paper Abstract

Bacteriorhodopsin (BR), a photochromic retinal protein, has been developed into a new materials platform for applications in anti-counterfeiting. The combination of three different properties of the material on its molecular level, a light-inducible color change, photochemical data storage and traceability of the protein due to molecular marker sequences make this protein a promising material for security applications. The crystalline structure of the biopigment combines these properties with high stability. As BR is a biological material specialized knowledge for modification, cost- effective production and suitable processing of the material is required. Photochromic BR-based inks have been developed for screen printing, pad printing and ink jet printing. These prints show a high photochromic sensitivity towards variation of illumination. For this reason it is not possible to reproduce the dynamic color by photocopying. In addition to such visual inspection the printed symbols offer the possibility for digital write-once-read-many (WORM) data storage. Photochemical recording is accomplished by a two-photon process. Recording densities in a range from 106 bit/cm2 to 108 bit/cm2 have been achieved. Data structures are stored in a polarization sensitive mode which allows an easy and efficient data encryption.

Paper Details

Date Published: 3 June 2004
PDF: 8 pages
Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); doi: 10.1117/12.522279
Show Author Affiliations
Norbert A. Hampp, Phillips-Univ. Marburg (Germany)
Martin Neebe, Phillips-Univ. Marburg (Germany)
Thorsten Juchem, Phillips-Univ. Marburg (Germany)
Markus Wolperdinger, Munich Innovative Biomaterials GmbH (Germany)
Markus Geiger, Agfa-Gevaert AG (Germany)
Arno Schmuck, Agfa-Gevaert AG (Germany)

Published in SPIE Proceedings Vol. 5310:
Optical Security and Counterfeit Deterrence Techniques V
Rudolf L. van Renesse, Editor(s)

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