Hello all,
Sorry to reply a bit late. But here is my long due resolution .
The key here lies in visualizing each of the mode at different k0*p (or angles). If you look at my graphs that I have attached in my replies, there actually exists the dispersion behaviour of the unit cell that I want to observe. I have highlited the mode, I am looking for in the image attached. Compare it with the one previously posted in the thread.
However, the problem occurs when the simulation softwares mixes the modes. The softwares (SW) here (CST and HFSS) are both sort of dumb. Both the SWs connect the the points (for the modes) which are at the minimum frequency.
To elaborate, if you look at the whole simulation domain it is sort of a waveguide on its own. Hence the simulation domain itself contains the modes TE10, TE20 TE11 and so on. Now this modes gets mixed up with the mode that we are looking for.
So my advice would be:
Use CST and turn on the result cache (CST, I found to be easier to view fields that HFSS, be careful though requires lots of space.). Vary the k0*p.. observe the modes at each different angles. You will be able to make sense what modes you should be looking at.
To design your unit cell:
1. Use driven-mode simulation to get the approximate diagram of dispersion. (I have found for me atleast, it is sufficient
)
2, Now that you know the approx diagram, simulate eigenmode, save result cache. use the above graph as guide.
Hopefully, this helps everyone, let me know if you face any problem.
Thank you to
@PlanarMetamaterials for helping out.