(a) The reflection, transmission and mode conversion efficiencies of TE-BSW propagating across a single groove versus the in-plane incidence angle. (b) The electric field intensity distribution for the TE-BSW when it strikes to the grooves (T-G) with incidence angle at 60°. (c) The reflection, transmission and mode conversion efficiencies of TE-BSW propagating across two grooves versus the incidence angle. (d) The electric field intensity distribution for TE-BSW when it strikes to the grooves (T-G) with incidence angle at 45°. (e) The reflection, transmission and mode conversion efficiencies of TM-BSW propagating across two grooves versus the incidence angle. (f) The electric field intensity distribution for the TM-BSW when it strikes to the grooves (T-G) with incidence angle 64°. The white dashed lines parallel to the Y axis in (b), (d) and (f) denote the exterior boundaries of monitoring and transforming grooves (M-G and T-G). The mode conversion efficiencies of Tsp and Tps (shown in (a), (c) and (e)) are magnified by a factor of 10. The structural parameters of all the grooves and dielectric multilayer are the same as those used in the experiments (Fig. 4), respectively.