{"id":392322,"date":"2024-10-31T20:52:17","date_gmt":"2024-10-31T20:52:17","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392322\/"},"modified":"2024-10-31T20:52:17","modified_gmt":"2024-10-31T20:52:17","slug":"392322","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/392322\/","title":{"rendered":"Reply To: Help in bandstructure simulation"},"content":{"rendered":"<p>&lt;p&gt;&nbsp;&ldquo;updating slab modes&rdquo; is just a reminder message. No worry about it.&lt;\/p&gt;&lt;p&gt;&#8221;Gamma-X sweep from 0-1 &#8221; it sould be from 0 to 0.5 since it is folded.&lt;\/p&gt;&lt;p&gt;I would suggest you to continue using 3D FDTD as 2D varFDTD might not be that accurate.&lt;\/p&gt;&lt;p&gt;I guess there are some unwanted frequency points on the &#8220;bands&#8221;. Usually it means the simulation time needs to be a little bit long. But it cannot be too long to reach autsohutoff min default value of 1e-5. Otherwise the bands will have some missing points.&lt;\/p&gt;&lt;p&gt;You may need to use symmetry-type of BCs to separate TE\/TM modes if the structure has some symmetry: https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034382694-Symmetric-and-anti-symmetric-BCs-in-FDTD-and-MODE&nbsp;&lt;\/p&gt;&lt;p&gt;Other factors please read this post:&nbsp;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<a href=\"https:\/\/forum.ansys.com\/forums\/topic\/ansys-insight-why-my-simulation-result-is-different-from-published-paper-or-experiment\/\">Ansys Insight: Why my simulation result is different from published paper or experiment?<\/a>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392322","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/392322","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/392322\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=392322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}