Fig. 8
Typical situations of a a silica substrate-supported WS2-clad MNW (Ag-WS2-sub.), b a multilayer WS2-clad MNW (Ag-multi. WS2), and c a WS2-clad MNW with a silica insulating layer (Ag-SiO2-WS2). (i) Schematic plot (left) and mode profile at the excitonic resonance (right). (ii) Rabi splitting dispersion of the corresponding PEPPs (red lines). Yellow and black dashed lines: SPPs and excitons. (iii) Normalized mode area Am/λ2. (iv) Propagation length Lm. (v) Figure of merit (FOM). The free-standing WS2-clad MNW (Ag-WS2) is also provided for comparison and plotted as black dashed lines in (ii–v). The thickness of the insulating layer in c is 5 nm. The diameter of the Ag MNW here is 50 nm