Fig. 1. Schematic diagram of the proposed WWTHSW: (a) 3D diagram; (b) cross-section.

Fig. 2. Modes analysis of the WWTHSW with different Hand g: (a) MC, (b) L_p, and (c) A;and normalized EM energy density distributions: (d) [H, g] = [10, 0.05] μm; (e) [H, g] = [40, 0.05] μm; (f) [H, g] = [90, 0.05] μm.

Fig. 3. Modes analysis of the WWTHSW with different αand θ, (a) L_p, (b) A; and normalized EM energy density distributions: (c) with different α at a fixed θ of 80°, (d) with different θ at a fixed α of 100°.

Fig. 4. Modes analysis of the WWTHSW with different dand h, (a) L_p, (b) A, and (c) normalized EM energy density.

Fig. 5. Performance comparison of the WWTHSW, HTMWSPPs and HTBTSPPs wavguide: (a) cross-section views; (b) the relationship between A and L_p; and (c) FOM with different parameters.

Fig. 6. Coupling characteristic of waveguides: (a) schematic diagram parallel waveguides; (b) L_cversus the separation between the two waveguides; (c) the maximum transfer power (P_max) as a function of distance D.