Reflection spectroscopy for anisotropic materials: Direct determination of phase differences; validity of Fresnel formulas

摘要: The reflectance of an anisotropic crystal is generally a tensor quantity even at normal incidence. Phase differences among the components can be obtained from polarized measurements. A simple method for doing so described and tested here. Possible applications phase-difference information range checking Kramers-Kronig evaluations absolute phases to substituting procedure. In addition, following proved, subject some assumptions: If reflection extinction directions exist, standard Fresnel equations may used derive optical constants ($n$'s $k$'s), regardless anisotropy crystal. Moreover, come in perpendicular pairs.