Oblique quasi-lossless excitation of a thin silicon slab waveguide: a guided-wave variant of an anti-reflection coating

Radiation losses at a junction of high-contrast Si/SiO_2 slabs of different thicknesses can be avoided, if, for excitation by semi-guided waves, the angle of incidence is raised beyond a critical angle. By introducing an additional short waveguide segment of intermediate thickness at the junction, ...

Source: Journal of the Optical Society of America B - August 9, 2019 Category: Physics Authors: Manfred Hammer Lena Ebers Jens F ö rstner Source Type: research