Experimental extraction of rough surface parameters from speckles in the deep Fresnel region with a scanning fibre-optic probe

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• 作者：Guotao Liang (1499)
  Xing Li (1499)
  Meina Zhang (1499)
  Zhenhua Li (1499)
  Chunxiang Liu (1499)
  Chuanfu Cheng (1499)
  
• 关键词：Optical Phenomena and Photonics
• 刊名：The European Physical Journal D - Atomic, Molecular and Optical Physics
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：67
• 期：4
• 全文大小：785KB
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• 作者单位：Guotao Liang (1499)
  Xing Li (1499)
  Meina Zhang (1499)
  Zhenhua Li (1499)
  Chunxiang Liu (1499)
  Chuanfu Cheng (1499)
  
  1499. College of Physics and Electronics, Shandong Normal University, Jinan, Shandong, 250014, P.R. China
  
• ISSN：1434-6079

文摘

Using the autocorrelation of speckles in the deep Fresnel region is a novel approach to measuring surface parameters of a rough surface. In this letter, we construct a scanning system using a fibre-optic probe for detecting the speckle field with excellent resolution. By relating the autocorrelation function of the speckle intensity and the surface height with the Kirchhoff approximation theory, we realise the measurement of the surface parameters. Three parameters, i.e. the roughness w, the lateral correlation length ξ and roughness exponent α are extracted. We measure two sample surfaces in the experiment, and the results are consistent with those measured by atomic force microscope (AFM).