How to implement cylindrical geometries for modes and S parameter calculations

[raksharuia]

I am trying to find the best way to perform computations for S parameter calculation for cylindrical waveguides and structures formed of layers of different cylinders. I could not find it directly in the geometry class. Are an approximation of n sided polygon and/or providing an index ndarray the only way to go?

[raksharuia]

@hammy4815 found circle_to_n() in utils.py to simulate a circular transverse section. This returns a numpy array (2D) of refractive index profile but there are a few bugs in passing this 'n' to the ModeSolver class's MSEMpy.

• there is no implementation for the case where 'n' (refractive index profile) is given and width/thickness are not necessary.
• A bypass to this could be to use epsfunc to generate epsfunc() in tools.py but contradictions with arguments exist.