Open AccessAnalysis of reflectance curve of turbid media and determination of the non-surface complex refractive index
Author(s) -
Jiwen Sun,
Jin Wang,
Qing Ye,
Jianchun Mei,
Wenyuan Zhou,
Chunping Zhang,
Jianguo Tian
Publication year - 2015
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.23.024602
Subject(s) - refractive index , optics , penetration (warfare) , penetration depth , materials science , total internal reflection , fresnel equations , reflectivity , physics , mathematics , operations research
Based on the theory of Goos-Hänchen shift and its continuity near the critical angle, we introduce the concept of penetration depth below the critical angle, and obtain the general formula of reflectance using the gradient complex refractive index multilayered model. Compared with the fitting curve with Fresnel's Formula, our calculated results are more consistent with experimental results of Intralipid solution and the suspension of rutile TiO(2) powder. Combining the change of penetration depth near the critical angle with our model, we also reveal the essence of a simple method used to obtain the non-surface complex refractive index of turbid media.