Sweep of LNCF versus SiC width at \(\lambda\) = 775 nm (part a) and  \(\lambda\) = 1550 nm (part b) for SiC heights of 100 nm, 150 nm, 200 nm, and 250 nm. c and d show mode pictures for wSiC = 100 nm and hSiC = 100 nm (part c) and wSiC = 200 nm and hSiC = 100 nm (part d) for the SH mode (top) and the FH mode (bottom). d has a higher \(\eta_0\) than c because of its reduced Aeff, despite having a lower LNCF for the SH wave.