细菌视紫红质的自衍射效率与最佳入射角研究  

Research on Self-Diffraction Efficiency and the Optimal Incident Angle Based on Bacteriorhodopsin Film

作　　者：王刚志[1,2] 陈桂英[3] 袁义哲[4] 张春平[5] 许棠[5,6] 宋奇望[5] 

机构地区：[1]天津大学 [2]天津科技大学理学院物理部,天津300222 [3]中国科学院南海海洋研究所热带海洋环境动力学重点实验室 [4]天津科技大学理学院物理部 [5]南开大学光子学中心 [6]湛江师范学院测量中心,广东湛江524048

出　　处：《光子学报》2006年第8期1211-1215,共5页Acta Photonica Sinica

基　　金：国家自科学基金(60578020);广东省自然科学基金资助(04011427)

摘　　要：研究了弱光强下细菌视紫红质膜(bR膜)的自衍射特性.给出了弱光强下相干光在bR膜中产生的振幅光栅光强分布模型,并用ysinαx近似表示透射光强分布,结果与实验吻合.给出了不同透射光强y与指数α的对应关系.结果表明,在bR膜及入射光波波长给定的情况下,入射光强越小,对应的α值越大,当入射光强为0.072/T(mW/cm2)时,α等于1.计算出不同入射光强和入射角下的自衍射效率.结果发现,对应于最大衍射效率的最佳入射角为2°.The self-diffraction characteristics of bacteriorhodopsin （bR） film illuminated by weak light were studied. The model describing the distribution of the light intensity of the amplitude grating induced by interference light in bR film under weak light was given, and the distribution of the transmitted light intensity y from the amplitude grating was described approximately as ysinax, which was in agreement with the experiment. The relationship between y and a was obtained, which indicated that giveing the wavelength of incident light, the weaker the incident light intensity would become, the bigger a would get. When the incident light intensity was 0. 072/T （mW/cm^2）, a equaled to 1. From different incident intensities and incident angles, the self-diffraction efficiencies were calculated, from which it could be found that the optimal incident angle was 2° corresponding to the maximum diffraction efficiency.

关 键 词：自衍射 细菌视紫红质(bR) 衍射效率 最佳入射角 

分 类 号：O437[机械工程—光学工程]