{"id":395626,"date":"2024-11-28T09:00:18","date_gmt":"2024-11-28T09:00:18","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/what-theory-uses-lumerical-to-compute-farfield\/"},"modified":"2024-11-28T09:00:18","modified_gmt":"2024-11-28T09:00:18","slug":"what-theory-uses-lumerical-to-compute-farfield","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/what-theory-uses-lumerical-to-compute-farfield\/","title":{"rendered":"What theory uses Lumerical to compute farfield ?"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I&#8217;m working on a grating coupler used as an antenna for my thesis and am using farfield projection of Lumerical for my simulations.&lt;\/p&gt;&lt;p&gt;However I could not find how Lumerical compute the farfield, with which theory : is it scalar (Fresnel, Fraunhoffer approximations &#8230;) of vectorial ? I already checked some related article like this one : <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034914713-Far-field-projections-in-FDTD-overview\">https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034914713-Far-field-projections-in-FDTD-overview&nbsp;<\/a> but I would like to know how the propagation is done.&lt;\/p&gt;&lt;p&gt;At the moment I am using this feature like a black box, which is a problem if I want to thouroughly understand my simulation results. Could you tell me what theory is used for farfield projection ?&lt;\/p&gt;&lt;p&gt;Yours sincerely&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-395626","topic","type-topic","status-publish","hentry","topic-tag-farfield-2","topic-tag-LumericalFDTD-1","topic-tag-theory"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27833"],"_bbp_topic_id":["395626"],"_bbp_subscription":["354261","473055"],"_bbp_author_ip":["132.168.30.100"],"_bbp_reply_count":["2"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["354261","473055"],"_btv_view_count":["182"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1732822048:473055"],"_bbp_notification_enabled":["473055"],"_bbp_last_reply_id":["395982"],"_bbp_last_active_id":["395982"],"_bbp_last_active_time":["2024-12-02 15:37:03"]},"test":"e5c020b6305700a7d397f6967f4f5d350c167cb2"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/395626","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\/395626\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=395626"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}