{"id":284058,"date":"2023-05-15T16:14:27","date_gmt":"2023-05-15T16:14:27","guid":{"rendered":"\/forum\/forums\/topic\/te-tm-modes-in-grating-coupler-file\/"},"modified":"2023-05-15T16:14:27","modified_gmt":"2023-05-15T16:14:27","slug":"te-tm-modes-in-grating-coupler-file","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/te-tm-modes-in-grating-coupler-file\/","title":{"rendered":"TE TM Modes in Grating Coupler File"},"content":{"rendered":"<p>Hello, I want to know the optimal pitch for various grating coupler designs. I use the following file which already implements a grating coupler: https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042305334-Grating-coupler<\/p>\n<p>&nbsp;<\/p>\n<p>I am quite confused by the TM and TE mode settings. I want to determine the optical pitch once for the fundamental TE mode and once for the fundamental TM mode in the waveguide. The simulating uses both TM modes for Port 1 and Port 2 in the standard settings. If I change both to TE (for Port 1 and Port 2) I get a very bad FOM. Is seems that Port1 needs to always be TM mode. Can anyone explain me why? On the other hand, if I set Port 1 to the Fundamental TM mode and Port 2 to the Fundamental TE mode, I again get the same results as I had in the case where both Port 1 and 2 were Fundamental TM modes. Can anyone tell me what I am doing wrong and how I can launch TM modes in the waveguides?<\/p>\n","protected":false},"template":"","class_list":["post-284058","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["284946","2592"],"_bbp_author_ip":["23.39.172.22"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["825"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["284058"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","284946"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["284288"],"_bbp_last_active_id":["284288"],"_bbp_last_active_time":["2023-05-16 17:04:59"]},"test":"kportnerethz-ch"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/284058","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\/284058\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=284058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}