| Lambda | 1550 [nm] | Wavelength |
| W_SiO2 | 1.8 [um] | Width of the SiO2 waveguide |
| W_Si | 430 [nm] | Width of the Si waveguide |
| p1 | 10 | Control parameter |
| p2 | 10 | Control parameter |
| n_SiO2 | 1.5 | Refractive index of SiO2 |
| n_Si | 3.5 | Refractive index of Si |
| n_air | 1 | Refractive index of air |
| L_domain | 2 [um] | Length of the optimization region |
| W_domain | 3 [nm] | Width of the optimization region |
| eta_initial | 0.8 | Initial value of eta |
| d_PML | 0.8 [um] | Thickness of the PML region |