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 Topics: RF Module, Materials and functions, 4.0a, 3.5a, 4.3a
RSS feed   |   Turn on email notifications   |   8 Replies   Last post: February 21, 2013 8:00pm UTC

Arian Kirsch

January 14, 2011 3:12am UTC

Hi,

can anyone of you tell me if it is possible to define a graded index in comsol?
It seems as if sth. like this has been done in www.comsol.se/academic/papers/2871/
But how? Is it simply possible to use the coordinates as variables in the definition of global parameters for the dielectric properties?

This would mean, is just something like
parameter n
definition: factor * x
possible to achieve (simplified) a linear gradient of n over the geometric x dimension?
I would be happy about help.

Best regards

Arian

Ivar Kjelberg

January 14, 2011 11:59am UTC in response to Arian Kirsch

Hi

I'm not sure I'm getting exactly what you need, but generally you can use formulas in all (almost) fields of COMSOL, so why not rty it out on a simple verifiable example. Then it should be OK for a complex one ;)

--
Good luck
Ivar

Arian Kirsch

January 17, 2011 3:01pm UTC in response to Ivar Kjelberg

Dear Ivar,

the complexity is not my problem.
I just wonder how to refer to a spatial variable like x, y or z (cartesian) in a formula for a parameter.
Do you know, where to search for an answer?

Best regards

Arian

Ivar Kjelberg

January 17, 2011 3:37pm UTC in response to Arian Kirsch

Hi

there was a discussion, if I remember right, on one of the other treads (I'm seeing too many ;) with a reply from COMSOL I believe

--
Good luck
Ivar

Arian Kirsch

January 20, 2011 11:16pm UTC in response to Ivar Kjelberg

Thanks so far, I am still working on it... I found something but it did not really match my problems. I think, I will dive a bit deeper into this stuff. Unfortunately I find other people's results which must base on sth. like this but no explanation anywhere... but maybe I have simply not yet searched long enough. When I find a solution I will post it.

Best regards

Arian

Partha Maji

April 7, 2011 1:00pm UTC in response to Arian Kirsch

Dear Arian,
I'm also interested about the RI variation profile as that of the the graded one. If you have got what you were looking for pls inform.

Best regards,
Partha

ehsan Shah-Hosseini

July 8, 2011 7:48pm UTC in response to Partha Maji

I am also very interested. did you find a solution?

Thanks

SK Varshney

November 15, 2011 8:55am UTC in response to Partha Maji

You need to design several circles with gradient index. Or you can define the refractive index profile function for a core region.

SK Varshney

Felipe Beltran-Mejia

February 21, 2013 8:00pm UTC in response to SK Varshney

I'd figure it out and I'm posting it just for the record:

Expand the material node and create a function (right click) under the sub-node "Refractive index". After that, you can call the function inside this node by using the sintax:

functionName(param1, param2, ..., paramN)

hope this helps.

cheers,
--
Felipe BM

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