Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Gain Medium with Circularly polarized light in COMSOL

Please login with a confirmed email address before reporting spam

Dear All
COMSOL follows exp(-iwt) modeling in the and hence the absorption of the material is given by imag(permittivity) >0.
If I want to simulate a gain medium, is it trivial to replace the imag(permittivity) < 0 ? or am I missing something.

The other question is regarding : how to set the circularly polarized light
Assume wave propagates in +x direction
E =(0 0 1) implies linear polarization
if I set E = ( 0 i 1) does this mean its a circularly polarized light since there is phase difference between Ex and Ey?


Any help will be appreciated.
Thank you.



2 Replies Last Post 04.02.2013, 12:44 GMT-5

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 31.01.2013, 13:25 GMT-5
I think COMSOL uses exp(iwt) for the time part.
I think COMSOL uses exp(iwt) for the time part.

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 04.02.2013, 12:44 GMT-5
Hi Pu
You are right. It is exp(iwt) hence imag(permittivity) <0 implies absorption and imag(permittivity) >0 implies gain.
Hi Pu You are right. It is exp(iwt) hence imag(permittivity) 0 implies gain.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.