Subwavelength Grating Structures in Silicon-on-Insulator Waveguides
Figure 1
Effective medium theory applied to square and triangular SWGs on a Si-air
interface. Top: schematic of the grating geometry. Center: filling factor
corresponding to the square and triangular SWGs. Bottom: resulting effective
refractive index profiles for light with the electric field along the grating
grooves (TM, dashed curves) and perpendicular to the grating grooves (TE, solid
curves).