Phase matched magneto optical single mode rib waveguides based on geometrical adjustments

Highly-efficient thin film LiNbO3 surface couplers connected by ridge-waveguide subwavelength gratings

“…It was reported that the GCs performance experience a dependence on the devices design and parameters selections as well as actual fabrication [25,27], to obtain a maximum CE product for the ridge-waveguide integrated LNOI GCs, the geometry and structure parameters of the proposed devices were fully considered such as the set of deeper etching depth of h for a better light mode confinement, large diffraction grating period, and the corresponding duty cycle. As for the effective media theory and gratings diffraction conditions [28][29][30][31], the light-coupling processes for the whole GCs structure integrated with SWG was simulated (Lumerical, Ansys), and the geometrical parameters were fully optimized. To achieve single mode light propagation in photonic waveguide, the simulated transverse-electric fields (E z ) distribution operated at 1550 nm was obtained, as shown in Fig.…”