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).