Figure 2

(a) Propagation length (L), (b) normalized mode area (A_eff /A₀) and (c) figure of merit (FoM) vs. gap height (h) under different wedge tip angles of the wedge hybrid plasmonic THz waveguide. The diameter of Si nanowire cylinder is 40 μm. The rectangular hybrid THz waveguide is also plotted for comparison (rectangle).