title: Evolutions of speckles on rough glass/silver surfaces with film thickness.
abstract: 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.
authors.affiliation: College of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
authors.forename: Meina
authors.initials: M
authors.lastname: Zhang
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Li
authors.forename: Xiaoyi
authors.initials: X
authors.lastname: Chen
authors.forename: Guotao
authors.initials: G
authors.lastname: Liang
authors.forename: Shuyun
authors.initials: S
authors.lastname: Wang
authors.forename: Shuyun
authors.initials: S
authors.lastname: Teng
authors.forename: Chuanfu
authors.initials: C
authors.lastname: Cheng
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005898:Glass / Q000737:chemistry*; D008422:Materials Testing; D008567:Membranes, Artificial; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000379:methods*; D013499:Surface Properties
chemical_list: D008567:Membranes, Artificial; D012834:Silver