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Subtract effective refractive indexes to find birefringence in a planar waveguide

Posted Mar 27, 2014, 9:19 a.m. EDT Version 4.3 0 Replies

Peter Lerwick
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Hi,
I am using the electromagnetic waves module to solve for modes in a square planar waveguide. The waveguide is single mode so I get two modes (TE and TM). I'm doing a parameteric sweep as well so I get pairs of values for each different geometry change. I can find the effective refractive indexs for both modes seperately but can't find a way to subract them to get the birefringence n(TM)-n(TE), which I want to plot.

I know its possible to export the data and do the subtraction offline but I would like to know if its possible to do it in Comsol by possibly subracting table columns or global variables.

Thanks for your help
Peter
0 Replies Last Post Mar 27, 2014, 9:19 a.m. EDT
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Hello Peter Lerwick

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