Fig. 4

Influence of the amount of material in the loading strip on the transmission spectra. a and b Variation of the waveguide width for a period p = 470 nm and a feature size d = 375 nm for the rounded corrugation and d = 335 nm for the holes. c and d Variation of the fill factor f for a fixed period p = 470 nm and a fixed waveguide width w = 1.2 μm