Fig. 3. Angle-resolved PL spectra of the WS2 monolayer on different substrates at room temperature.
a–f Angle-resolved PL spectra of the WS2 monolayer on three different substrates with σ+ (σ−) detection along the Γ-X direction. a and b correspond to the WS2 monolayer on a flat substrate. c and d correspond to the WS2 monolayer on the PhC slab with in-plane inversion symmetry. e and f correspond to the WS2 monolayer on the PhC slab without in-plane inversion symmetry. g, h Separation of σ+ (red) and σ− (blue) polarized light at 615 nm (dotted line) and 628 nm (solid line) in e, f. The maximum calculated P reaches 84%