Fig. 6

(a) Distribution of the electric field |E| at different wavelengths, (b) the real and imaginary parts of the n_eff, and (c) the FOM and L_C parameters of the waveguide as a function of wavelength. The other parameters are w = 120 nm, h = 100 nm, h₁ = 30 nm, h₃ = 20 nm, and μ_c = 0.6 eV.