Abstract
Simple and explicit expressions for the phase shifts that p- and s-polarized light experience in frustrated total internal reflection (FTIR) and optical tunneling by an embedded low-index thin film are obtained. The differential phase shifts in reflection and transmission are found to be identical, and the associated ellipsometric parameters are governed by a simple relation, independent of film thickness. When the Fresnel interface reflection phase shifts for the p and s polarizations or their average are quarter-wave, the corresponding overall reflection phase shifts introduced by the embedded layer are also quarter-wave for all values of film thickness. In the limit of zero film thickness (i.e., for an ultrathin embedded layer), the reflection phase shifts are also quarter-wave independent of polarization (p or s) or angle of incidence (except at grazing incidence). Finally, variable-angle FTIR ellipsometry is shown to be a sensitive technique for measuring the thickness of thin uniform air gaps between transparent bulk media.
© 2006 Optical Society of America
Full Article | PDF ArticleMore Like This
R. M. A. Azzam and F. F. Sudradjat
J. Opt. Soc. Am. A 28(6) 1256-1261 (2011)
S. R. Perla and R. M. A. Azzam
J. Opt. Soc. Am. A 24(10) 3255-3260 (2007)
R. M. A. Azzam and A. De
Opt. Lett. 28(5) 355-357 (2003)