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3 June 2004 Computer-generated holograms recorded in bacteriorhodopsin
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Proceedings Volume 5310, Optical Security and Counterfeit Deterrence Techniques V; (2004)
Event: Electronic Imaging 2004, 2004, San Jose, California, United States
Computer-generated holograms (CGH's) of phase modulation type have been designed and fabricated in the biological material Bacteriorhodopsin (BR). BR is a photochromic retinal protein which may be used in optical data storage and security applications. Using the permanent light-inducible refractive index change of BR, we demonstrate that both analog and digital optical data can be stored in this material in a write-once-read-many (WORM) mode. The calculation and the optimization of the phase function of the CGH's have been accomplished with iterative Fourier transform algorithm methods (IFTA) such as error reduction algorithms. In the fabrication procedure the optimized phase functions of the CGH's have been recorded in BR which was coated onto a glass substrate. A direct laser writing process employing the 532 nm line of a cw-Nd:YAG laser was used for recording the CGH as a modulation of the absorption coefficient as well as of the refractive index. The design and fabrication method of the CGHs with a pixel pitch of 20 μm and a total size of 10 mm x 10 mm are presented.
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Fouad Guessous, Thorsten Juchem, and Norbert A. Hampp "Computer-generated holograms recorded in bacteriorhodopsin", Proc. SPIE 5310, Optical Security and Counterfeit Deterrence Techniques V, (3 June 2004);

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