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

Figure 8

Case 2(b). The inner radius 𝑅₁=2. Marked eigenvalues: linear eigenvalue 𝛾≈2.461 (red dot 𝛾²≈6.056) and nonlinear eigenvalues 𝛾≈2.490, 𝛾≈3.219, and 𝛾≈3.736 (green, blue, and black dots, resp., 𝛾²≈6.200, 𝛾²≈10.362, and 𝛾²≈13.958).