Effect of absorption on surface speckles in random media |
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| Authors: | S Sangu T Okamoto J Uozumi T Asakura |
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| Institution: |
a Research Institute for Electronic Science, Hokkaido University, Hokkaido, Japan
b Department of Control Engineering and Science, Kyushu Institute of Technology, Fukuoka, Japan
c Faculty of Engineering, Hokkai-Gakuen University, Hokkaido, Japan |
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| Abstract: | We investigate the intensity fluctuations of light backscattered from absorbing random media. A numerical simulation which takes into account the interference among different scattering paths reveals that the contrast of speckle patterns appearing at the surface of the medium decreases with an increase of absorption in weak absorption regime, but increases for strong absorption. It is shown from a simple theoretical model that such a contrast variation is caused by changes in the power of diffusive-scattering waves and in the amplitude distribution of single and low-order scattering waves. |
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