3 POLARIZATION REFLECTOMETRY METHODS FOR DETERMINATION OF OPTICAL ANISOTROPY

Citation
Gi. Surdutovich et al., 3 POLARIZATION REFLECTOMETRY METHODS FOR DETERMINATION OF OPTICAL ANISOTROPY, Applied optics, 37(1), 1998, pp. 65-78
Citations number
25
Categorie Soggetti
Optics
Journal title
ISSN journal
00036935
Volume
37
Issue
1
Year of publication
1998
Pages
65 - 78
Database
ISI
SICI code
0003-6935(1998)37:1<65:3PRMFD>2.0.ZU;2-K
Abstract
Three novel methods for the determination of optical anisotropy are pr oposed and tested. The first, the special points method, may be applie d to any uniaxially anisotropic medium and is based on the measurement of s- and p-polarized light reflectances under near-normal or grazing angles (or both) and of the Brewster angle. The second method is base d on the use of the Azzam universal relationship between the Fresnel s - and p-reflection coefficients. For a flat surface and an isotropic m edium, the Azzam combination of coefficients becomes zero and thus is independent of the incidence angle, whereas for a uniaxial or biaxial anisotropic sample it acquires a certain angular dependence, which may be used to determine the anisotropy of the sample. Finally, for those cases in which the anisotropy of the material of a film deposited on an isotropic substrate is itself of interest, a third method, the inte rference method, is suggested. This technique makes use of the differe nt dependences of s- and p-polarized beam optical path-length changes on the variation of the angle of incidence. (C) 1998 Optical Society o f America.