{"id":377269,"date":"2024-08-05T14:08:41","date_gmt":"2024-08-05T14:08:41","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/doubts-about-field-enhancement-ee0-and-field-normalization\/"},"modified":"2024-08-05T14:10:15","modified_gmt":"2024-08-05T14:10:15","slug":"doubts-about-field-enhancement-ee0-and-field-normalization","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/doubts-about-field-enhancement-ee0-and-field-normalization\/","title":{"rendered":"Doubts about field enhancement E\/E0 and field normalization"},"content":{"rendered":"

Dear all, <\/p>\n

I hope you are doing well. <\/p>\n

I am currently working on high Q-factor metasurfaces to exploit the near field enhancing capability associated with narrow resonances.<\/p>\n

I have a doubt about the field normalization in lumerical FDTD\/RCWA and consequenly about the definition of field enhancement E\/E0.<\/p>\n

Starting from the latter, in literature many define the “field enhancement” as E\/E0 where E0 is either the input electric field amplitude or the electric field amplitude in absence of the metasurface.<\/p>\n

Regardless of the definition, the doubt I have is associated with the field normalization that Lumerical FDTD\/RCWA does on the fields.<\/p>\n

Basically, the normalization that I have set now is the CWNorm (first source)<\/strong> which, as written on the website, gives as results the field distribution as if the structure is injected with a CW source at a given frequency with amplitude set to 1<\/strong>.<\/p>\n

Additionally, all the simulations I did, consider a plane wave with amplitude set to 1.<\/p>\n

So, considering also the field plot reported below, my question is:<\/p>\n

Can I say that the maximum value reported of 124 is actually the field enhancement E\/E0? (About that, the criticality arises from the fact that if I reduce the amplitude of the input plane wave to 0.5, the field distribution I get has a maximum value of 62 which is the exact half of 124 so that if I calculate 62\/0.5 I get exacty 124).<\/strong><\/p>\n

 <\/p>\n

While, in case the value read from the monitor is not the field enhancement E\/E0? How could I calculate it having the field distribution?<\/p>\n

I wish you all a good day.<\/p>\n

 <\/p>\n

Regards<\/p>\n

 <\/p>\n

Giovanni<\/p>\n

\"\"<\/a><\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-377269","topic","type-topic","status-publish","hentry","topic-tag-e-field","topic-tag-highQ-1","topic-tag-metasurface-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["349934","33648"],"_bbp_author_ip":["193.204.49.157"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["627"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1722866951:349934"],"_bbp_topic_id":["377269"],"_bbp_forum_id":["27833"],"_bbp_engagement":["33648","349934"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["377989"],"_bbp_last_active_id":["377989"],"_bbp_last_active_time":["2024-08-12 16:38:04"]},"test":"giovanni-piscopomycit-ie"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/377269","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\/377269\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=377269"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}