Semi-analytical approach to sensitivity analysis of lossy inhomogeneous structures

We propose an adjoint-variable technique for sensitivity analysis with structured-grid EM solvers, which can handle lossy inhomogeneous materials. In previous discrete adjoint-based approaches, the response derivatives with respect to shape parameters require the solution of a perturbed geometry, which has to be approximated. Here, we improve the algorithm by proposing a semi-analytical sensitivity formula where the system matrix derivatives …