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Proceedings Paper

All-optical logical gates with bacteriorhodopsin films
Author(s): Devulapalli V. G. L. N. Rao; Francisco J. Aranda; Desai Narayana Rao; Z. Chen; Joseph A. Akkara; Masato Nakashima
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Paper Abstract

The photochromic protein bacteriorhodopsin (bR) obtained from the purple membrane of the halocbacterium halobium has attracted considerable amount of interest recently. Several applications in photonics technology have already been proposed. bR lends itself to structural alterations at the molecular level by use of bioengineering and chemical synthesis methods. It is very stable under hard environmental conditions of temperature, salinity, etc. The films that were used in our experiments are stable over a period of four years. The lifetimes of some of the intermediate states of bR photocycle can be altered over a wide range by genetic manipulations of some of the amino acids that compose the bR membrane or by controlling the pH of the host materials. All of this makes bR a very attractive material for applications in optical computers and information processing. We present a technique that utilizes the molecular states of a bR thin film to implement an all-optical switch and all-optical logic AND and Or gates. A two-color backward degenerate four-wave mixing geometry with wild-type and chemically stabilized films of bacteriorhodopsin constitute the experimental setup. The saturation intensity, sensitivity and excited state lifetime (M state lifetime) of the films are very different. We use red light to form a holographic grating,due to the B to M transition and blue light to form a grating due to the fast photochemical transition from.M to B. Each of the two wavelengths in the experimental system acts as an input to the all-optical gates and the phase conjugate signal beam is the output of the gates.

Paper Details

Date Published: 3 October 1996
PDF: 1 pages
Proc. SPIE 2897, Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications, (3 October 1996); doi: 10.1117/12.252925
Show Author Affiliations
Devulapalli V. G. L. N. Rao, Univ. of Massachusetts/Boston (United States)
Francisco J. Aranda, Univ. of Massachusetts/Boston (United States)
Desai Narayana Rao, Univ. of Massachusetts/Boston (United States)
Z. Chen, U.S. Army Natick Research, Development & Engineering Ctr. (United States)
Joseph A. Akkara, U.S. Army Natick Research, Development & Engineering Ctr. (United States)
Masato Nakashima, U.S. Army Natick Research, Development & Engineering Ctr. (United States)


Published in SPIE Proceedings Vol. 2897:
Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications
Manfred Eich; Bruce H. T. Chai; Minhua Jiang, Editor(s)

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