3 June 2004 Multifunctional optical security features based on bacteriorhodopsin
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Proceedings Volume 5310, Optical Security and Counterfeit Deterrence Techniques V; (2004); doi: 10.1117/12.522279
Event: Electronic Imaging 2004, 2004, San Jose, California, United States
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.
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Norbert A. Hampp, Martin Neebe, Thorsten Juchem, Markus Wolperdinger, Markus Geiger, Arno Schmuck, "Multifunctional optical security features based on bacteriorhodopsin", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004); doi: 10.1117/12.522279; https://doi.org/10.1117/12.522279
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KEYWORDS
Data storage

Printing

Binary data

Polarization

Anisotropy

Computer security

Proteins

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