A new 2-D image reconstruction algorithm based on FDTD and design sensitivity analysis

In this paper, we propose a numerical algorithm to reconstruct the complex permittivity profile of unknown scatterers by using the FDTD technique and design sensitivity analysis (DSA). By introducing DSA and the adjoint variable method, we can calculate the derivatives of error functions with respect to complex permittivity variables, and reduce the computational cost. The proposed method is validated by application to the reconstruction of unknown 2-D scatterers which are illuminated by TM/sup 2/ with a Gaussian pulsed plane wave.