计算物理 ›› 2007, Vol. 24 ›› Issue (5): 619-624.

• 研究论文 • 上一篇    下一篇

薄膜椭偏测量的自适应混合反演算法

井西利1, 徐天赋1, 陈秀娟2, 李栋宇1   

  1. 1. 燕山大学理学院, 河北 秦皇岛 066004;
    2. 大庆物探研究所, 黑龙江 大庆 163357
  • 收稿日期:2006-06-02 修回日期:2006-10-30 出版日期:2007-09-25 发布日期:2007-09-25
  • 作者简介:井西利(1964-),男,黑龙江,教授,从事计算物理方祛研究.
  • 基金资助:
    国家自然科学基金(40374048)资助项目

An Adaptive Hybrid Inversion Algorithm for Ellipsometric Measurement of Thin Films

JING Xili1, XU Tianfu1, CHEN Xiujuan2, LI Dongyu1   

  1. 1. College of Sciences, Yanshan University, Qinhuangdao 066004, China;
    2. Daqing Geophysical Institute, Daqing 163357, China
  • Received:2006-06-02 Revised:2006-10-30 Online:2007-09-25 Published:2007-09-25

摘要: 基于梯度的线性反演方法计算效率高,基于随机扰动的模拟退火方法寻找最优解能力强针对薄膜椭偏测量的多极值问题,综合两者的优点,提出一种求解薄膜椭偏测量问题的混合反演算法.模型每次扰动采用线性寻优方法搜寻局部最优解,叠代过程中采用均匀设计的模拟退火方法随机搜寻模型,使该算法有跳出局部最优解的能力,可以在较少的叠代次数内搜寻到全局最优解,从而提高求解薄膜椭偏测量非线性反演方法的计算效率.对反演过程控制参数进行讨论,该算法具有自适应的特点.计算表明,该算法可有效求解薄膜椭偏测量的多极值问题.

关键词: 椭偏测量, 模拟退火, 薄膜

Abstract: A hybrid optimization algorithm is developed for solving ellipsometric measurement problem.This algorithm is based on the high ability of simulated annealing method in seeking optimum solution and the high computation efficiency of simple shape method.It seeks the global minimum solution of objective function and gets proper parameters of optical model.The computation efficiency is higher than that of simulated annealing algorithm.The selection of inversion controlling parameters is discussed to make this algorithm adaptive.

Key words: ellipsometry, simulated annealing, thin film

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