Open AccessEvolutions of speckles on rough glass/silver surfaces with film thickness
Author(s) -
Meina Zhang,
Zhenhua Li,
Xiaoyi Chen,
Guangxin Liang,
Shuyun Wang,
Shuyun Teng,
Chuanfu Cheng
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.008831
Subject(s) - speckle pattern , optics , scattering , materials science , fractal , surface plasmon , speckle imaging , plasmon , physics , mathematics , mathematical analysis
This paper reports experimental studies on speckles produced by the rough silver films. The speckles on the rough glass/silver surfaces are measured with a microscopic imaging system. The structures of speckle patterns have the characteristics of fractals and multi-scaled sizes. We find that with the increase of the silver film thickness, the contrast of the speckles increases, and the intensity probability density functions gradually transit to exponential decay. We calculate the global and the local correlation functions of the speckle patterns, and find that both the fractal exponent and correlation length of the small-sized speckles decrease with the thickness of the silver films. We use the mechanisms of rough dielectric interface scattering and random surface plasmon waves to give the preliminary explanations for the evolutions of the speckles.