ModePROP Product Overview

ModePROP™ is an eigenmode expansion propagation tool that accounts for both forward and backward propagation and radiation modes. It provides a rigorous steady-state solution to Maxwell's equations that is based on the highly-stable Modal Transmission Line Theory. A full array of analysis and simulation features make this tool flexible and easy to use.

Simulation results that show the field scattered by an air groove


  • Incorporates advanced algorithm options that extend the basic RCWA to improve its robustness, efficiency, and user friendliness.
  • Fully integrated into the RSoft CAD Environment.


ModePROP has applications including, but not limited to:

  • Waveguide/Fiber-based systems
  • Surface-normal grating couplers
  • Plasmonic devices
  • Sensors
  • Filters
  • Mode converters
  • Photonic bandgap
  • Computing coupling efficiency


  • Full-vectorial analysis for both Cartesian and cylindrical (azimuthally symmetric) structures in 2D and 3D.
  • Modal Transmission Line (MTL) framework to ensure that the simulation is unconditionally stable.
  • Accounts for reflections.
  • User-defined initial field.
  • Accommodates complex index for lossy materials and high index contrast profiles.
  • Robust meshing scheme which conforms to the structure.
  • PML boundary conditions.
  • Output information includes field profiles for any component, transmission/reflection of individual modes as well as total values, and the Poynting Vector.
  • Automated parametric studies and design optimization using MOST.

Simulated field within a surface plasmon based interferometer that is operating out of phase

Application Gallery