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HL: Fachverband Halbleiterphysik

HL 1: Optical Properties I

HL 1.7: Vortrag

Montag, 9. März 2026, 11:15–11:30, POT/0006

Polarization-resolved Raman measurements on optically anisotropic crystals — •Susanne Moritz, Lukas Trefflich, Ron Hildebrandt, Marius Grundmann, and Chris Sturm — Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik, Germany

Raman spectroscopy provides a powerful, non-destructive way to probe lattice vibrations, crystal symmetry, and electron-phonon interactions. For years, optically anisotropic materials have been gaining importance in solid-state physics research. These materials are investigated by measuring the Raman intensity in two configurations, namely cross-polarized and parallel polarization. However, due to their low symmetry, this is not sufficient in order to extract the properties of the Raman tensor and extensive polarization-resolved Raman measurements are required for a precise determination, particularly of the Raman tensor [1,2,3]. Here, we present an efficient measurement scheme in order to determine the Raman tensor of optically anisotropic materials with high precision. Special care must be taken regarding the influence of the used polarizing optics, such as half-wave plates, as well as the impact of the non-idealities of all optical elements included in the setup, such as mirrors or beam splitters. For this purpose, we also show a procedure for calibrating these elements.
[1] C. Kranert et al., Phys. Rev. Lett. 116, 127401 (2016)
[2] C. Kranert et al., Sci. Rep. 6, 35964 (2016)
[3] R. Hildebrandt et al., Appl. Phys. Lett. 119, 121109 (2021)

Keywords: Raman spectroscopy; Polarization