I am trying to get transmission phase curve of a graphene-based unit cell in CST but I get wrong results. although the unit cell is not symmetric, the phase curves are the same for TE and TM flouqet modes.
I got correct result for silver but for graphene it did not work.!!
Can any one help me about the problem?
In normal situation, the thickness of graphene is setted as 0.33 or 1 nm in CST simulation. I think the key point is whether the graphene thin layer has been involved in simulation. the best way to confirm that is setting a e-field or current density monitor and analyzing whether the e-field or current density is asymmetric or even exist.
Futhermore, there are several things which should be checked in simulation:
(1) Are the optical parameters of graphene correct? for i don't know the working wavebands, i just rocommend one paper which give the optical parameters of graphene in mid-infrared.
(2) Is the mesh setting correct? the automatic mesh generator is an effective way for mesh generation, but a more suitable way is setting local mesh properity of graphene with maximum mesh step width no more than 5 nm. you can change this parameter from 1 to 5 nm to see the affect of it on the S-parameter and find a stable result.
(3) of course, the affect of the thickness of graphene should be analyzed , but the result has been already shown in the support information of article:Appl. Phys. Lett. 102, 131108 (2016); doi: http://dx.doi.org/10.1063/1.4800931 which can be treated as a reference.
http://phy.nankai.edu.cn/grzy/schen/My%20published%20paper/adom201500398.pdf
Can you please give more information about your structure? Are you sure you have defined graphene correctly?
regards.
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