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More services...How to active inner boundary?
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3 Replies
Last post: May 2, 2012 12:48am UTC
May 1, 2012 9:46am UTC
How to active inner boundary?
Dear all,
I am stuck when I build the plasmonic grating model based on the "plasmonic wire graring" model
Now I would like to add two PML layers on the top and bottom,respectively.
However, you know, when the PMLs are added, all the inner boundaries are unavailable for the definition of any BC.
I would calculate the transmission and reflection, so how can I define the Port BC?
Million thanks!
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May 1, 2012 7:57pm UTC in response to Marvin Farrell
Re: How to active inner boundary?
You can't use PMLs with Port BCs. But Port BCs are transparent to specified plain waves so you don't really need PMLs.
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May 1, 2012 10:15pm UTC in response to Alexander Kuznetsov
Re: How to active inner boundary?
Thanks for your reply!
Actually I faced the same problem described here
www.comsol.com/community/forums/general/thread/27642/
So I would like to add PMLs to absorb the light.
According to the model of "plasmonic wire grating", does it mean we should define lots of PORT BCs to absorb the light?
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May 2, 2012 12:48am UTC in response to Marvin Farrell
Re: How to active inner boundary?
Yes. If you use plane wave illumination, then you need to define one port BC per each diffraction order. Based on wavelength, grating period and angle of incidence, you can calculate which diffraction order you will have.
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