Dielectric function and magneto-optical Voigt constant of Cu₂O: A combined spectroscopic ellipsometry and polar magneto-optical Kerr spectroscopy study

Cuprous oxide is a highly interesting material for the emerging field of transparent oxide electronics. In this work the energy dispersion of the dielectric function of Cu₂O bulk material is revised by spectroscopic ellipsometry measurements in an extended spectral range from 0.73 to 10 eV. For the first time, the magneto-optical Kerr effect was measured in the spectral range from 1.7 to 5.5 eV and the magneto-optical Voigt constant of Cu₂O was obtained by numerical calculations from the magneto-optical Kerr effect spectra and the dielectric function.