{"id":369292,"date":"2024-05-30T23:06:13","date_gmt":"2024-05-30T23:06:13","guid":{"rendered":"\/forum\/forums\/topic\/setting-simulation-parameters-for-thin-film-coating-on-pillar\/"},"modified":"2024-05-30T23:06:13","modified_gmt":"2024-05-30T23:06:13","slug":"setting-simulation-parameters-for-thin-film-coating-on-pillar","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/setting-simulation-parameters-for-thin-film-coating-on-pillar\/","title":{"rendered":"Setting simulation Parameters for Thin Film Coating on Pillar"},"content":{"rendered":"

Hi <\/p>\n

I am simulating with FDTD a library of Pillars of SiO2 on a substrate of SiO2 and everything is coated with a thin layer of TiO2. I am having difficulties to set the right parameters for the distances of the Transmission monitor, PML boundary distances from the structure, the simulation time, autoshutoff value and mesh size. <\/p>\n

The problems arise because, the thin coating makes the structure resonate a lot and it takes a lot of time to finish the simulation because it has reached the autoshutoff value. Moreover to resolve the thin coating I have to use a fine mesh. I have to simulate around 40.000 structures and I am trying to find the optimal values to make the simulation region as small as possible and the simulation as short as possible. <\/p>\n

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Which values for “simulation time”, “autoshutoff” should I use? Currently I am using 10000 fs, 1e-5. <\/p>\n

What is the optimal distance of the trasmission monitor from the top of the pillar? I have to record the field to then do farfieldexact, and I want to record only the far field and not any possible near evanescent field.<\/p>\n

How far from the transmission monitor and\/or top of the pillar should the top PML boundary be? <\/p>\n

How far from the reflession monitor and\/or bottom of the pillar should the bottom PML boundary be? <\/p>\n

What is the minimum number of Yee cells that should be present in the coating in order to resolve it? At the moment I am using a mesh of 8nm defined around the pillar and coating. <\/p>\n

The xy size of the FDTD is 450nm. The Pillar is 2um tall and I am simulating broadband 400nm-700nm. <\/p>\n

Best<\/p>\n

Luca<\/p>\n","protected":false},"template":"","class_list":["post-369292","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["56001","50911"],"_bbp_author_ip":["184.24.96.207"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["223"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["369292"],"_bbp_forum_id":["27816"],"_bbp_engagement":["50911","56001"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["369539"],"_bbp_last_active_id":["369539"],"_bbp_last_active_time":["2024-06-03 08:29:15"]},"test":"lsacchig-harvard-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369292","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\/369292\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=369292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}