Ag/AAO纳米有序阵列复合结构等效光学参量的确定  

Determination of optical parameters of ordered Ag/AAO nano-array composite structure

作　　者：王建[1] 王成伟[1] 李燕[1] 刘维民[2] Zaima Shigeaki 

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730070 [3]名古屋大学结晶材料科学系

出　　处：《物理学报》2005年第12期5920-5925,共6页Acta Physica Sinica

基　　金：甘肃省自然科学基金(批准号:ZS021-A25-029-C);西北师范大学科技创新工程(批准号:KJCXGC-214)资助的课题.~~

摘　　要：引入厚度偏差Δd,修正了薄膜透射率表达式.基于Ag/AAO纳米有序阵列复合结构实验透射光谱(500—2700nm)的两条极值包络线,定义了一个优化函数,结合最优化数值算法尝试确定具有较强吸收的Ag/AAO纳米有序阵列复合结构的等效光学参量.由此计算了该结构的等效折射率n、等效消光系数k、平均等效厚度-d以及厚度偏差Δd.该方法对Ag/AAO纳米复合结构平均等效厚度的相对计算误差仅为0.3%,与实测厚度基本一致,且Ag/AAO纳米复合结构的模拟透射谱与实验透射光谱在500—2700nm波段范围内相符.这表明该计算方法可有效确定Ag/AAO纳米复合结构的等效光学参量,并与实验结果是自洽的.The optical transmission function is modified by taking account of the influence of thickness variation △d on transmission of thin films. Meanwhile, we introduce an optimization technique and define an evaluating function, such that a simple method is developed based on the envelope curves of the optical transmission spectrum over the wavelength range 500-2700 nm at normal incidence, which is used for the determination of the equivalent refractive index n, equivalent extinction coefficient k, average equivalent thickness d and thickness variation △d of the ordered Ag/AAO nano-array composite structure. The relative error is about 0.3 % in the calculation of average equivalent thickness ↑-d. The simulated transmission of Ag/AAO nano-array composite structure is in satisfactory agreement with the measuremental values. All these results show that with this simple method the optical parameters of Ag/AAO nano-array composite structure can be calculated of accurately and the results are consistent with the experiment.

关 键 词：薄膜光学 光学参量 纳米复合结构 最优化算法 

分 类 号：O484[理学—固体物理]