Hello,<\/p>\n
I am facing an issue related to defining a simulation time for measuring the quality factor of a high-Q cavity.<\/p>\n
I employ a dipole cloud to excite the resonant modes within the cavity and, using a high-quality analyzer integrated into FDTD (Finite-Difference Time-Domain) simulations (you can find more information at https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360041611774-Quality-factor-calculations-for-a-resonant-cavity), I attempt to determine the quality factor.<\/p>\n
My question pertains to the simulation time. Given that my resonator possesses an exceptionally high-quality factor, ranging between 400,000 and 1.2 million, I encounter challenges in reaching the auto-shutoff level, for instance, 1e-5 or 1e-6.<\/p>\n
Through several trials, I have observed that in some cases, a duration of 1000 femtoseconds (fs) is not as reliable, but there isn’t a significant difference between 2000 and 1000 fs.<\/p>\n
My assumption was that, since the method measures the slope of energy within the cavity and we are utilizing a time-domain approach to calculate the intrinsic quality factor, it should not be heavily dependent on the simulation time.<\/p>\n
I would greatly appreciate your guidance on determining an adequate simulation time, especially since energy depletion does not occur within a reasonable timeframe. Additionally, if you could advise on what would be a reasonable auto-shutoff level, that would be immensely helpful.<\/p>\n
Thank you for your assistance.<\/p>\n","protected":false},"template":"","class_list":["post-307517","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["267492","2592"],"_bbp_author_ip":["96.7.74.191"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["147"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["307517"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","267492"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["307740"],"_bbp_last_active_id":["307740"],"_bbp_last_active_time":["2023-09-20 18:19:55"]},"test":"sme8gatech-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/307517","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\/307517\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=307517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}