Nonlinear Double-Layer Bragg Waveguide: Analytical and Numerical Approaches to Investigate Waveguiding Problem

Figure 2

Case 1(a). The inner radius 𝑅₁=2. Marked eigenvalues: linear eigenvalue 𝛾≈2.524 (red dot 𝛾²≈6.370) and nonlinear eigenvalues 𝛾≈2.573 and 𝛾≈2.962 (green and black dots, resp., 𝛾²≈6.620 and 𝛾²≈8.770).