The FEM Solver
A finite element mode solver
The FEM Solver brings the finite-element method to FIMMWAVE and is offered as an optional add-on to the FIMMWAVE base module.
Modelling a Holey Fibre. Left and centre: Intensity profile of
the fundamental mode. Right: Detail of the triangular mesh.
Using the FEM Solver you can automatically locate and analyse the eigenmodes of almost any waveguide supported by FIMMWAVE. It will model both real and lossy
materials and anisotropic dielectric tensors (diagonal tensor) and will
do so rapidly and accurately.
The FEM Solver is ideal to solve complex waveguide
geometries as its highly optimised mesh can adapt itself to virtually
any arbitrary shape.
Features:
Real and complex versions
Bend mode version
Speed and accuracy enhanced for horizontally and/or vertically symmetric structures
Anisotropic waveguides
Fast: calculates many modes simultaneously
First and second order elements
High quality, fast fully automatic mesh generator optimised for electro-magnetic problems
Mode analysis tools
- compute confinement factor, group index, dispersion etc, see
utilities.
The FEM Solver supports perfect electric wall and perfect magnetic wall boundary conditions.
Structures for which the FEM Solver is recommended:
Circular or elliptical fibres
Waveguides with mixed geometries: rectangles and ellipses
Odd-Shaped waveguide with curved and/or slanting interfaces
Waveguides with both large and very small features
Photonic-crystal fibres
Diffused waveguides and other structures with smoothly varying refractive index
Metallic structures
See also the
Mode Solver Features Table for comparison with other solvers.
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