Figure 2. Effect of 2.0 nm Au deposition on MoS₂ photoluminescence (PL).

(a) AFM image of MoS₂ flake as exfoliated. Cross marks indicate the location of the PL data presented in (b). (b) PL signal as a function of focal plane from above the surface (f1) to several tens of nm below the surface (f7). For clarity the curves were shifted of 4 units for each step. (c) PL spectra of 2 L MoS₂ flake as exfoliated (red) and after 2.0 nm Au deposition (black). (d) Plasmonic response of the bare SiO₂ substrate (red) and SiO₂ substrate covered with the Au nanoislands (black).