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Proceedings Paper

Theoretical analysis of optical properties of dielectric coatings dependence on substrate subsurface defects
Author(s): Jian Shen; Shouhua Liu; Zicai Shen; Jianda Shao; Zhengxiu Fan
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Paper Abstract

A model for refractive index of stratified dielectric substrate was put forward according to theories of inhomogeneous coatings. The substrate was divided into surface layer, subsurface layer and bulk layer along the normal direction of its surface. Both the surface layer (separated into N1 sublayers of uniform thickness) and subsurface layer (separated into N2 sublayers of uniform thickness), whose refractive indices have different statistical distributions, are equivalent to inhomogeneous coatings respectively. And theoretical deduction was carried out by employing characteristic matrix method of optical coatings. An example of mathematical calculation for optical properties of dielectric coatings had been presented. The computing results indicate that substrate subsurface defects bring about additional bulk scattering and change propagation characteristic in thin film and substrate. Therefore, reflectance, reflective phase shift and phase difference of an assembly of coatings and substrate deviate from ideal conditions. The model will provide some beneficial theory directions for improving optical properties of dielectric coatings via substrate surface modification.

Paper Details

Date Published: 1 February 2006
PDF: 6 pages
Proc. SPIE 6034, ICO20: Optical Design and Fabrication, 60341C (1 February 2006); doi: 10.1117/12.668146
Show Author Affiliations
Jian Shen, Shanghai Institute of Optics and Fine Mechanics (China)
Chinese Academy of Sciences (China)
Shouhua Liu, Shanxi Univ. of Science and Technology (China)
Zicai Shen, Shanghai Institute of Optics and Fine Mechanics (China)
Chinese Academy of Sciences (China)
Jianda Shao, Shanghai Institute of Optics and Fine Mechanics (China)
Zhengxiu Fan, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 6034:
ICO20: Optical Design and Fabrication
James Breckinridge; Yongtian Wang, Editor(s)

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