Fig. 1. Physical models of unidirectional waveguide based on SMPs. (a) Structural diagram in x-y plane; (b) structural diagram in y-z plane

Fig. 2. Range for existence of SMPs (εd=2.28)[inset is enlarged view of region in dashed circle, and dots in inset correspond different ratios (scaling factor pm is from 0.1076 to 0.1083 at interval of 0.0001)]

Fig. 3. SMPs dispersion curve for photon energy around 1.1 eV( dot corresponds to photon energy of 1.1 eV)

Fig. 4. Distributions of electric field amplitudes of SMPs. (a) Direction of magnetic field towards -z direction; (b) direction of magnetic field towards +z direction; (c) source is placed inside gyroelectric material, 20 nm below interface (at position of star); (d) normalized electric field amplitude at dashed line in Fig. 4(a); (e) normalized electric field amplitude along interface in Fig. 4(a)

Fig. 5. Robustness of SMPs. (a) There is protrusion on transport interface; (b) there is depression on transport interface; (c) normalized electric field amplitude in transmission direction corresponding to Fig. 5(a); (d) normalized electric field amplitude in transmission direction corresponding to Fig. 5(b)

Fig. 6. Distribution of electric field amplitude of SMPs passing through 90° waveguide