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Mode analysis - changing refractive index
Posted May 6, 2011, 7:33 a.m. EDT RF & Microwave Engineering, Materials, Parameters, Variables, & Functions, Results & Visualization 3 Replies
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Hi,
I am currently doing a mode analysis and need to do a simulation with different refractive index. I want
the refractive index for one region in my geometric model to vary between '2 + eps' to '2 - eps'. How can I
do this the best way?
Is it possible to .. create a parameter 'nd' = 2, and then another parameter 'deps' = 0. Next step is creating a function called 'n_func(deps)', in which is equal to 'n_func = nd + deps'. Then I create a parametric sweep for variable called 'deps' between [2 + eps, 2 - eps] and placing n_func(deps) in the refractive index input for that material of the wanted region?
The problem is I dont get the same result (same refractive index and nodes) for when deps = 0, that is when nd = 2 = n_func(deps). As far as I can see I haven't changed the two files that much other than adding n_func to the one of the files.
Is there a way to save the resulting effective refractive index per n_func(deps) as vector text file or similar to be opened in matlab?
Many thanks for any assistance.
I am currently doing a mode analysis and need to do a simulation with different refractive index. I want
the refractive index for one region in my geometric model to vary between '2 + eps' to '2 - eps'. How can I
do this the best way?
Is it possible to .. create a parameter 'nd' = 2, and then another parameter 'deps' = 0. Next step is creating a function called 'n_func(deps)', in which is equal to 'n_func = nd + deps'. Then I create a parametric sweep for variable called 'deps' between [2 + eps, 2 - eps] and placing n_func(deps) in the refractive index input for that material of the wanted region?
The problem is I dont get the same result (same refractive index and nodes) for when deps = 0, that is when nd = 2 = n_func(deps). As far as I can see I haven't changed the two files that much other than adding n_func to the one of the files.
Is there a way to save the resulting effective refractive index per n_func(deps) as vector text file or similar to be opened in matlab?
Many thanks for any assistance.
3 Replies Last Post May 13, 2011, 4:42 p.m. EDT
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Posted:
1 decade ago
Hi
first of all "eps" is already a COMSOL internal variable, use something else, my way would be:
Global Definitions Parameter deps = 0
Material property or "physics material property user defined" index value n = 2+deps
Solver: add Parametric sweep on parameter deps = 0.2*range(-1,0.1,1)
The latter you can do by either add a "Study Parametric Sweep" or at the sub node level: Stationary Solver 1, add Parametric
--
Good luck
Ivar
first of all "eps" is already a COMSOL internal variable, use something else, my way would be:
Global Definitions Parameter deps = 0
Material property or "physics material property user defined" index value n = 2+deps
Solver: add Parametric sweep on parameter deps = 0.2*range(-1,0.1,1)
The latter you can do by either add a "Study Parametric Sweep" or at the sub node level: Stationary Solver 1, add Parametric
--
Good luck
Ivar
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi
first of all "eps" is already a COMSOL internal variable, use something else, my way would be:
Global Definitions Parameter deps = 0
Material property or "physics material property user defined" index value n = 2+deps
Solver: add Parametric sweep on parameter deps = 0.2*range(-1,0.1,1)
The latter you can do by either add a "Study Parametric Sweep" or at the sub node level: Stationary Solver 1, add Parametric
--
Good luck
Ivar
Thank you!
One more question. How do you do parametric sweep twice but for different parameters? Is it possible?
Will it play out as like for two for-loops, i.e
for i = 1: 3
for j = 1: 5
-- text --
end
end
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Posted:
1 decade ago
Hi
in the parametric (or continuation) sweep, you add two or more parameter names, then the raneg netry must be sorted in pair, triplets (check the doc and the forum, there have already been many discussions and examples about this (use the "search" function)
--
Good luck
Ivar
in the parametric (or continuation) sweep, you add two or more parameter names, then the raneg netry must be sorted in pair, triplets (check the doc and the forum, there have already been many discussions and examples about this (use the "search" function)
--
Good luck
Ivar