{"id":366190,"date":"2024-05-08T22:16:36","date_gmt":"2024-05-08T22:16:36","guid":{"rendered":"\/forum\/forums\/reply\/366190\/"},"modified":"2024-05-08T22:16:36","modified_gmt":"2024-05-08T22:16:36","slug":"366190","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/366190\/","title":{"rendered":"Reply To: Nonlinear Diffraction Grating in FDTD"},"content":{"rendered":"<p>&lt;p&gt;Hi Saar,&lt;br&gt;&lt;br&gt;Bloch BCs are set to a single wavevector, so a change in frequency will have an angle offset.&nbsp; Since you are looking at different frequencies, I think this is why the grating orders are not in the corresponding angles.&nbsp; This should have some more information to help you: <a title=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/1500006417822-bloch-bcs-in-broadband-sweeps-over-angle-of-incidence\" href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/1500006417822-Bloch-BCs-in-broadband-sweeps-over-angle-of-incidence\" target=\"_blank\" rel=\"noreferrer noopener\">Bloch BCs in broadband sweeps over angle of incidence &ndash; Ansys Optics<\/a>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Likewise, since you are looking for a generated response, you might need to be careful about the input field and make sure that you are not including your second harmonic frequency in your input. &nbsp;This page might be helpful in this regard: <a title=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042190413-harmonic-generation-with-a-chi2-material\" href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042190413-Harmonic-generation-with-a-chi2-material\" target=\"_blank\" rel=\"noreferrer noopener\">Harmonic generation with a chi2 material &ndash; Ansys Optics<\/a>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-366190","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/366190","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\/366190\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=366190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}