Figure 3
(a) Variation of coupling length Lc with the width ds and number of Si strip and without Strip for two adjacent silicon waveguides with geometrical parameters w = 1.5 µm, h = 0.6 µm, and d = 0.5 µm. Electric field (Ey) distribution (2D surface plot) of symmetric and antisymmetric TE modes for each case at effective width where Lc reaches the largest value. (b) 1-Si strip with width 170 nm, (c) 2-Si strips with width 105 nm, (d) 3-Si strips with width 77 nm, and (e) 4-Si strips with width 59 nm. The images of Electric field distribution are created by COMSOL Multiphysics 5.3, https://www.comsol.com (license number—17074294) released to Zewail City of Science and Technology, Giza, Egypt.
