Fig. 1. MoS₂ flakes prepared by mechanical stripping

Fig. 2. The schematic of polarized Raman test system

Fig. 3. Raman spectra of MoS₂ excited by laser at different wavelengths

Fig. 4. The multi-peak fitting results of MoS₂ resonance Raman spectrum

Fig. 5. The whole resonance Raman spectra of MoS₂ flakes excited with different polarization directions

Fig. 6. The polar diagram and fitting curves of the Raman intensities with polarization angles for different modes

Fig. 7. The polar diagram of the Raman intensities with polarization angles for different modes