{"id":366072,"date":"2024-05-08T12:03:38","date_gmt":"2024-05-08T12:03:38","guid":{"rendered":"\/forum\/forums\/topic\/photonic-crystal-cavity-with-different-cladding\/"},"modified":"2024-05-08T12:03:38","modified_gmt":"2024-05-08T12:03:38","slug":"photonic-crystal-cavity-with-different-cladding","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/photonic-crystal-cavity-with-different-cladding\/","title":{"rendered":"Photonic Crystal Cavity with Different Cladding"},"content":{"rendered":"<p>Hi,<\/p>\n<p>I have a 2D photonic crystal cavity that I am simulating using Lumerical, I am trying to calculcate the high-Q value. I have a periodic cavity structure with an L3 defect. Before I was setting the index of refraction of the FDTD region to be 1.0 and the holes material to be of etch type as well. Now I want to change the index of refraction of the FDTD region to 1.44 and index of refraction of etch type I have already created with 1.44. However, I am now getting negative Q values, and very high dQ. What changes do I need to make to the mesh region and the other conditions so as to simulate a pulse propagation with 1550nm dipole at the center?<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/08-05-2024-1715169677-mceclip0.png\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/08-05-2024-1715169721-mceclip1.png\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/08-05-2024-1715169765-mceclip2.png\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/05\/08-05-2024-1715169810-mceclip3.png\"><\/p>\n<p>Thanks,<br \/>Sayan<\/p>\n","protected":false},"template":"","class_list":["post-366072","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["348310","2592"],"_bbp_author_ip":["23.196.2.137"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["186"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["366072"],"_bbp_forum_id":["27784"],"_bbp_engagement":["2592","348310"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["366456"],"_bbp_last_active_id":["366456"],"_bbp_last_active_time":["2024-05-10 15:51:41"]},"test":"sayan-bandyopadhyayglasgow-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/366072","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\/366072\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=366072"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}