{"id":365736,"date":"2024-05-06T18:38:37","date_gmt":"2024-05-06T18:38:37","guid":{"rendered":"\/forum\/forums\/topic\/nonlinear-diffraction-grating-in-fdtd\/"},"modified":"2024-05-06T18:38:37","modified_gmt":"2024-05-06T18:38:37","slug":"nonlinear-diffraction-grating-in-fdtd","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/nonlinear-diffraction-grating-in-fdtd\/","title":{"rendered":"Nonlinear Diffraction Grating in FDTD"},"content":{"rendered":"<p>Hi, I want to simulate a &#8220;nonlinear diffraction grating&#8221; in Lumerical FDTD. It&#8217;s basically a diffraction grating with a chi2 material, a plane wave source (with an angled incidence) in a fundamental frequency and I&#8217;d like to measure its reflected and transmitted grating orders in the far field for the second harmonic frequency.<\/p>\n<p>I&#8217;ve tried to simulate a unit cell w\/ Bloch BCs with no success (doesn&#8217;t return the correct grating orders in the corresponding angles).<\/p>\n<p>Is there a way to perform this simulation (whether with Bloch BC, RCWA solver or any other way) in FDTD?<\/p>\n","protected":false},"template":"","class_list":["post-365736","topic","type-topic","status-closed","hentry","topic-tag-gratings-farfield-2","topic-tag-LumericalFDTD-1","topic-tag-nonlinear-material"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["38587","119680"],"_bbp_author_ip":["23.192.127.5"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["247"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["365736"],"_bbp_forum_id":["27833"],"_bbp_engagement":["38587","119680"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["366190"],"_bbp_last_active_id":["366190"],"_bbp_last_active_time":["2024-05-08 22:16:36"]},"test":"saarpmail-tau-ac-il"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/365736","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/365736\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=365736"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}