FIMMWAVE's mode solvers were used to calculate the modes of a silicon cross- slot waveguide ; slot waveguides use a combination of high-index and low-index. This example uses FEM (finite element method) to analyze a slot waveguide structure . In exploring the computation of the fundamental TE mode of this. ______. *Electronic Address: [email protected] Slot - waveguide Analysis and Fabrication of a Planar Dielectric Waveguide. Author: David Sánchez Gonzalo.