Generalized ellipsometry for orthorhombic, absorbing materials: dielectric functions, phonon modes and band-to-band transitions of Sb2S3

Generalized ellipsometry allows complete extraction of the dielectric function tensor, including orientation, from measurement of skew-cut single crystal orthorhombic absorbing materials. As an example, Stibnite (Sb2S3) is studied to determine fundamental phonon modes and band-to-band transitions, which are here provided for polarization along axes a, b, and c from lineshape analysis of the major dielectric function spectra.