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Proceedings Paper

Real-time holographic pattern recognition with bacteriorhodopsin films
Author(s): Norbert A. Hampp; Ralph Thoma; Christoph R. Braeuchle; Dieter Oesterhelt
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Paper Abstract

The biological photochrome bacteriorhodopsin (BR) has attractive photophysical properties which allow its use as the photoactive component for dynamic recording media for optical applications. Purple membrane (PM) patches, which contain BR in a two-dimensional crystalline lattice, are isolated from Halobacterium halobium. Polymeric films with embedded PM are well suited reversible media for holographic recording. In addition, artificial derivatives of BR with improved optical properties can be generated by genetic methods and isolated from the mutated halobacterial strains. The high reversibility (> 106 record/erase cycles), the fast timescale of its photoconversions (fs - ms), and the high resolution (> 5000 lines/mm) make these films suitable media for real-time holographic applications. A dual-axis joint-Fourier-transform correlator is described with two liquid crystal television screens as input devices and a BR-film as active holographic material in the Fourier plane. The experimental data presented demonstrate that this system is capable of processing two independent video signals in real-time with a signal-to-noise ratio of 45 dB. The polarization recording properties of BR-films offer an efficient method to separate the correlation signal from scattered light.

Paper Details

Date Published: 2 March 1993
PDF: 11 pages
Proc. SPIE 1732, Holographics International '92, (2 March 1993); doi: 10.1117/12.140405
Show Author Affiliations
Norbert A. Hampp, Univ. of Munich (Germany)
Ralph Thoma, Univ. of Munich (Germany)
Christoph R. Braeuchle, Univ. of Munich (Germany)
Dieter Oesterhelt, Max-Planck-Institute of Biochemistry (Germany)

Published in SPIE Proceedings Vol. 1732:
Holographics International '92
Yuri N. Denisyuk; Frank Wyrowski, Editor(s)

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