【作者】 李玉栋；

【导师】 张光寅； 张春平；

【作者基本信息】 南开大学 ， 凝聚态物理， 1999， 博士

【摘要】 随着社会的发展，光学与光子学技术逐渐成为信息产业、工业生产、人民生活等各方面的重要技术支柱。光学与光子学成为当今国际科研的热点。细菌视紫红质(Bacteriorhodopsin)材料是自然界经过长期进化形成的一类优良的生物光学与光子学材料，它具有高非线性光学特性、高稳定性、低价格等优良特性。本论文从理论和实验两方面深入地研究了bR膜中的非线性透射特性、光致光栅、简并多波耦合及其应用等问题。 本论文第一章简要地介绍了细菌视紫红质的一些基本性质，其中主要介绍了bR分子的化学结构，基本性质，特别是bR分子的光循环和质子泵功能，bR膜制备等问题，并简要分析总结了国内外对bR材料的研究成果和趋势。 第二章主要研究了bR膜的透射特性及应用。本章介绍了bR膜光循环的简化，并在两态光色系统模型的基础上推导了多束不同波长的光照射下的bR膜透射方程。我们利用数值计算方法分析了黄、紫光同时照射下bR膜的透射特性。结果显示bR膜中黄光透射具有饱和吸收特性。黄光阈值光强受到紫光光强的调制，随着紫光光强的增大而增大。此外，黄光阈值光强也受到bR膜参数，如bR膜浓度、M态寿命等的影响。利用黄光在bR膜中的饱和吸收特性以及紫光对黄光透射的调制特性，我们首次讨论了bR膜在全光取阈操作中的应用，并首次利用“胜者全取”操作对图象进行了亮背景滤除，大大提高了有背景噪音的图象的信噪比。 bR膜是一种优良的实时全息记录材料。第三章讨论了bR膜中的光致光栅和简并多波耦合等问题。本章介绍了光照下bR膜的吸收系数和折射率的变化及二者的关系。我们实验研究了bR膜中普通全息光栅的衍射效率，首次发现衍射效率依赖于记录光的光强而变化，并对这一现象给出了定性的解释。我们介绍了bR膜中的光致各向异性和偏振光栅。本章讨论了普通全息光栅及偏振光栅记录光、读出光和衍射光三者之间的偏振关系。我们还介绍了bR膜中的简并多波耦合，并首次实验研究了各种参数(光强、耦合光夹角等)对简并多波耦合的影响。 第四章利用bR膜实现了多种光学信息处理操作，如图象强度反转、新事物滤波和单调滤波等。我们首次根据黄、紫光同时照射bR膜时的互补调制透射特性，更多还原

【Abstract】 Optics and photonics have become the powerful support of information technique, industry, human life and other important aspects of modern society. bR film is one type of excellent nonlinear optical materials and has many outstanding properties such as large optical nonlinearity, high stability, low price and so on. In the thesis, we mainly studied theoretically and experimentally the nonlinear transmission properties, photo-induced grating, degenerate multi-wave mixing in bR film and their applications.The first chapter outlined the fundamental properties of bacteriorhodopsin materials, which include chemical structure, basic properties, especially the photocycle and the proton pump function of bacteriorhodopsin molecular, preparations of bR film and etc.. And we summarized the obtained results and future directions of research in bR material.Chapter 2 mainly studied the transmission properties of bR film and their application. It was derived the transmission equation of bR film under the simultaneous illuminations of purple light and yellow light based on the simplified two-state system, and the transmission properties of bR film were analyzed by using the numerical method. The calculated results showed there is a saturation absorption effect for yellow light transmission in the bR film. The thresholding intensity of yellow light is influenced by purple light and increases with the increase in the intensity of purple light. Parameters of bR film, such as density of bR film, lifetime of molecular in M state also influence the thresholding intensity of yellow light. According to the saturation absorption effect of yellow light and the modulation effect of purple light in bR film, for the first time we analyzed application of bR film in optical thresholding operations. And we realized the filter of bright background of pattern by winner-take-all operation in bR film, which can be used to improve the signal-to-noise ratio of input image with noise.bR film is one type of excellent real-time holographic materials. The third chapter discussed photo-induced gratings and degenerate multi-wave mixing in bR film. The photo-induced change in absorption coefficiency and in refractive index and their relationship were summarized. We studied experimentally the diffraction efficiency of normal gratings in bR film, and discovered for the first time that the diffraction efficiency depends on the intensity of writing beam and then explained it briefly. Photo-induced anisotropy and polarized hologram in bR film were discussed. The relationship among the更多还原