{"id":318271,"date":"2023-11-17T21:57:14","date_gmt":"2023-11-17T21:57:14","guid":{"rendered":"\/forum\/forums\/reply\/318271\/"},"modified":"2023-11-17T21:57:14","modified_gmt":"2023-11-17T21:57:14","slug":"318271","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/318271\/","title":{"rendered":"Reply To: Plane wave and Bloch boundary conditions in slab waveguide"},"content":{"rendered":"<p>&lt;p&gt;Hi Erik,&lt;\/p&gt;&lt;p&gt;Sorry about this, I did discuss your simulation with my colleague a few days back, but I didn&#8217;t have time to test these suggestions myself so, I hadn&#8217;t posted my reply.&nbsp;&lt;\/p&gt;&lt;p&gt;In our opinion, the results for example the transmisson spectrum should&#8217;t change from 0 to 85 deg, as the slab is infinite along the y-direction. So, in our opinion you should change the orientation of the structure and perform a single 2D simulation. The infinite direction &#8220;y&#8221; should now be along the &#8220;z&#8221;-direction.&nbsp;&lt;\/p&gt;&lt;p&gt;But we also think that it would be interesting to do 3D simulation as well, and the results should be identical or very close in our opinion. For a 3D simulation we would also ask you to inject a mode source. Then in mode slection choose &#8220;user select&#8221; followed by &#8220;Select mode&#8221;. The eigenmode solver will pop-up. Then go to its boundary conditions tab, override the default boundaries and change the y boundary to Bloch.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/17-11-2023-1700258228-mceclip0.png\" width=\"670\" height=\"494\" \/>&lt;\/p&gt;&lt;p&gt;Let me know if you have questions.&lt;\/p&gt;&lt;p&gt;Regards,&lt;br&gt;Amrita&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-318271","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi Erik,Sorry about this, I did discuss your simulation with my colleague a few days back, but I didn&#039;t have time to test these suggestions myself so, I hadn&#039;t posted my reply. 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