{"id":319683,"date":"2023-11-28T06:42:51","date_gmt":"2023-11-28T06:42:51","guid":{"rendered":"\/forum\/forums\/topic\/absorbtion-in-fdtd-two-methods-differents-results\/"},"modified":"2023-11-28T06:57:37","modified_gmt":"2023-11-28T06:57:37","slug":"absorbtion-in-fdtd-two-methods-differents-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/absorbtion-in-fdtd-two-methods-differents-results\/","title":{"rendered":"Absorption in FDTD two methods different results"},"content":{"rendered":"

Hi,<\/p>\n

I am testing a simple 3D simulation in FDTD of a silicon block illuminated by a plane wave at 850nm. I am calculating the absorption of silicon using two methods. The first one is the method used in Lumerical example”Planar silicon solar cell” using the relation A=1-R-T where R and T are the reflection and the transmission obtained by monitors. I get around 37% absorption in this case. The second method is using the Pabs_total representing the total power absorbed per wavelength. I am applying for this a monitor (box ) encapsulating the silicon material. Here I obtain around 26% absorption only. Why does the second method give a different value? Does Pabs_total need additional calculations using scrpting? Isn’t it direct ? If not, what does the 26% represent in my case?<\/p>\n

Thank you.<\/p>\n

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 <\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-319683","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["249205","55269","50911"],"_bbp_author_ip":["168.143.243.14"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["668"],"_edit_lock":["1701154096:174890"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["319683"],"_bbp_forum_id":["27833"],"_bbp_engagement":["50911","55269","249205"],"_bbp_voice_count":["3"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["320018"],"_bbp_last_active_id":["320018"],"_bbp_last_active_time":["2023-11-29 11:41:53"]},"test":"dbenhamadouaus-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/319683","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\/319683\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=319683"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}