The plot shows the profile of a mode travelling along a small aluminium bar buried in a waveguide. Note how it "clings" to the bar. The Complex Engine calculates that this mode has a loss of 1.47/µm so it wouldn't get very far!
General
What is FIMMWAVE?
A flexible design interface
A variety of robust
FE Mode Solver
The Molab
A variety of design utilities
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Feature/options table
Mode solver
Feature table
Platforms
Customer support