FIG. 6.

The amplitude of polarization transformation coefficients as a function of the incidence angle (a) $r_{012}^{sp}$ for the polarization transformation of TE₀-BSW to TM₁-BSW, (b) $r_{012}^{ps}$ for the polarization transformation of TM₁-BSW to TE₀-BSW. The solid lines denote the results obtained from Eq. (4), and the triangles denote the results obtained from the mode-matching method. The black dotted line denotes the polarization transformation coefficient of BSW for a single groove. The insets in the figure describe the simplified model of multiple reflection of BSW between the two grooves.