685326.fig.009
Figure 9: Results of modal analysis in ANSYS showing the standing wave pattern of the symmetric ridge mode on left and the antisymmetric ridge mode on right. In both cases, the fields span half a wavelength along the length of the block. The color represents displacement in the x- and y-direction for the symmetric and antisymmetric case, respectively. Entire blocks are not shown because their heights are much larger than their lengths.