Anomalous Raman Polarization Behaviors of ReS2 Thin Layers on Au Thin Film

ReS₂ thin layers exhibit polarization-dependent Raman behaviors owing to anisotropic electron–phonon interaction. Herein, we observed anomalous Raman polarization behaviors of ReS₂ flakes prepared on Au thin films. In the angle-resolved polarization Raman spectroscopy (ARPRS) measurement, the intensity polarization plots of different Raman modes of the ReS₂ flakes prepared on gold thin film rotate by certain angles compared with those of the same flake prepared on SiO₂. In particular, such rotation depends strongly on the flake thickness and the excitation laser wavelengths. The maximum rotation angles can be 14.8° for the $A_g^3$ mode of the 3L and 40° for the $A_g^2$ mode of the 7L, respectively. Such observations greatly enrich the anisotropic optical behaviors of ReS₂, which may facilitate the design of future anisotropic optoelectronic devices.