菌紫质光致各向异性动力学的理论和实验  

Theoretical and Experimental Studies on Kinetics of Photoinduced Anisotropy of Bacteriorhodopsin

作　　者：韩俊鹤[1,2,3] 姚保利[1] 郜鹏[1] 陈利菊[1] 王英利[1] 雷铭[1] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,陕西西安710119 [2]河南大学物理与电子学院,河南开封475004 [3]中国科学院研究生院,北京100049

出　　处：《光学学报》2008年第10期2010-2014,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60678023和60337020)资助课题

摘　　要：对菌紫质(Bacteriorhodopsin,BR)薄膜的光致各向异性特性进行了理论模拟。由随机取向的极性BR分子构成的聚合物薄膜在宏观上是各向同性的,但在线偏振光的作用下,BR分子对激发光的选择性吸收,导致不同异构体分子取向的不均匀分布,从而使BR薄膜在宏观上呈现出各向异性。利用BR光循环的二能级模型,得到了B态分子取向分布随时间的变化关系,推导出了BR薄膜光致各向异性动力学的数学表达式,模拟了不同激发光强下BR薄膜的光致各向异性动力学曲线,得到了和实验结果一致的计算结果。The polymeric film embedded with polar bacteriorhodopsin （BR） molecules is isotropic in macroscopy since the BR molecules are randomly distributed. Upon excitation by a linearly polarized light, selective absorption of BR molecules with respect to the polarization orientation of the excitation light makes the nonuniformly distributed orientation of BR molecules, resulting in a macroscopic anisotropy. According to the two-state model of BR photocycle, the time-dependent orientation distribution of BR molecules in B state is obtained. The kinetic equations of the photoinduced anisotropy of the BR-film are derived. The kinetic curves of the photoinduced anisotropy at different intensities of excitation light are simulated, which are consistent with experimental results.

关 键 词：信息光学 全息存储 光致各向异性 菌紫质(BR) 

分 类 号：O438.1[机械工程—光学工程]