Method for fast computation of angular light scattering spectra from 2D   periodic arrays
  An efficient numerical method for computing angle-resolved light scattering off periodic arrays is presented. The method combines finite-element discretization with a Schur complement solver. A significant speed-up of the computations in comparison to standard finite-element method computations is observed. 
J. Pomplun, S. Burger, L. Zschiedrich, P. Gutsche, F. Schmidt
physics.optics physics.comp-ph