Real-time holographic pattern recognition with bacteriorhodopsin films

Norbert A. Hampp; Ralph Thoma; Christoph R. Braeuchle; Dieter Oesterhelt

doi:10.1117/12.140405

2 March 1993 Real-time holographic pattern recognition with bacteriorhodopsin films

Norbert A. Hampp, Ralph Thoma, Christoph R. Braeuchle, Dieter Oesterhelt

Proceedings Volume 1732, Holographics International '92; (1993) https://doi.org/10.1117/12.140405
Event: Holographics International '92, 1992, London, United Kingdom

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.

Citation Download Citation

Norbert A. Hampp, Ralph Thoma, Christoph R. Braeuchle, and Dieter Oesterhelt "Real-time holographic pattern recognition with bacteriorhodopsin films", Proc. SPIE 1732, Holographics International '92, (2 March 1993); https://doi.org/10.1117/12.140405

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available