Good afternoon,
Thanks very much for the help.
At the date I got the same result because I’m doing 3D simulations, but I’m doing now another with better mesh parameters.
We think that the problem is in the definition of the APML layer, please if you could take look in the document that is in attached.
In this document you can see two plots, the first one, figure 1, is a spectrum obtained with the OptiFDTD and the second one is the plot obtained with Rsoft which is the correct one ( the result coincide with the experimental results).
The position of the first dip, the narrower in OptiFDTD is correct, is very similar to the one in the Rsoft but with OptiFDTD we can’t find the second dip, the broader one. Instead we observe a lot of small oscillations that we think that are related to undesired reflections.
Thanks for the attention,
Miguel Simões Rosa
Instituto Superior Técnico, Universidade de Lisboa
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