Calculated reflection coefficients of a single planar interface with an optically biaxial Cu(en)(H2O)(2)SO4 material compared to experiment

Abstract

In our previous work we presented ellipsometric measurement of (ratios of) reflection coefficients of a planar interface between air and a facet of a single-crystal monoclinic (i.e., anisotropic) material Cu(en)(H2O)(2)SO4, en = C2H8N2. The reported dependence of the coefficients on azimuthal orientation of the crystal, Figure 1 below, showed features which were ascribed to misalignment from the then-assumed ideal orientation. Here, using Berreman's formalism, we show on theoretical grounds that misalignment may truly result in the observed findings.