Figure 5
From: Easy-hard phase transition in parameter estimation for optical waveguides
Energy landscapes for a stratified cylinder with \(\vec {d}_{\text {real}} = (50,100)\, \upmu \hbox {m}\), \({\text {Re}}(n_2) = 1.457\), \({\text {Re}}(n_1) = 1.1\times {\text {Re}}(n_2)\) and various absorption coefficients \(\kappa _1\) and \(\kappa _2\). The colour map indicates low values of the objective function \(R(\vec {d})\) in blue and high values in red. The axes show the differences \(d_1-d_{1,\text {real}}\) and \(d_2-d_{2,\text {real}}\) in \( \upmu \hbox {m}\) units.
