All-optical logical gates with bacteriorhodopsin films
All-optical logical gates with bacteriorhodopsin films
复制标题
带有细菌视紫红质薄膜的全光逻辑门
DOI：
10.1117/12.252925
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
M. Nakashima
中科院分区：
文献类型：
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作者：
D. Rao;F. Aranda;D. N. Rao;Z. Chen;J. Akkara;M. Nakashima
从盐生盐杆菌（Halocbacterium halobium）紫膜中分离得到的光致变色蛋白细菌视紫红质（bR）是近年来研究的热点。已经提出了光子技术中的几种应用。通过使用生物工程和化学合成方法，bR适合于在分子水平上的结构改变。它在温度、盐度等恶劣环境条件下非常稳定。我们实验中使用的薄膜在四年内都是稳定的。bR光循环的一些中间状态的寿命可以通过对构成bR膜的一些氨基酸的遗传操作或通过控制宿主材料的pH而在宽范围内改变。所有这些都使得bR在光学计算机和信息处理中的应用成为非常有吸引力的材料。我们提出了一种技术，利用分子状态的bR薄膜实现全光开关和全光逻辑与或门。一个双色后向简并四波混频几何与野生型和化学稳定的细菌视紫红质膜构成的实验装置。薄膜的饱和强度、灵敏度和激发态寿命（M态寿命）有很大的不同。由于B到M的跃迁，我们使用红光来形成全息光栅，并且由于从M到B的快速光化学跃迁，我们使用蓝光来形成光栅。实验系统中的两个波长中的每一个都作为全光门的输入，相位共轭信号光是全光门的输出。
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.