Figure 4

(a) Propagation length (L) and normalized mode area (Aeff /A0), (b) figure of merit (FoM) and (c) chromatic dispersion vs. frequency from 0.1 to 2 THz. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm and the gap height is 0.2 μm.