{"id":349035,"date":"2024-02-05T08:23:43","date_gmt":"2024-02-05T08:23:43","guid":{"rendered":"\/forum\/forums\/topic\/oscillations-of-reflectance-transmittance-in-fdtd-results\/"},"modified":"2024-02-05T08:23:43","modified_gmt":"2024-02-05T08:23:43","slug":"oscillations-of-reflectance-transmittance-in-fdtd-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/oscillations-of-reflectance-transmittance-in-fdtd-results\/","title":{"rendered":"Oscillations of reflectance &amp; transmittance in FDTD results"},"content":{"rendered":"<div>Hello,&nbsp;<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/05-02-2024-1707120084-mceclip0.png\" width=\"975\" height=\"549\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/05-02-2024-1707120313-mceclip1.png\" width=\"1011\" height=\"548\"><\/div>\n<div>I simulated the structure of the polymer layer on the PET substrate. (Fig 1.)<\/div>\n<div>&nbsp;<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/05-02-2024-1707121298-mceclip2.png\" width=\"1198\" height=\"674\"><\/div>\n<div>And I imported each material&#8217;s n, k value and fit the parameters. (Fig 2.)<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>&nbsp;<\/div>\n<div>The FDTD results showed a similar trend with experimental results in reflectance (~ 5%) and transmittance (~ 90%).<\/div>\n<div>&nbsp;<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/05-02-2024-1707121339-mceclip3.png\" width=\"1145\" height=\"644\"><\/div>\n<div>However, the FDTD results have severe oscillations as you can see in Fig 3, whereas the experimental results show a flat graph of reflectance and transmittance.<\/div>\n<div>&nbsp;<\/div>\n<div><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/05-02-2024-1707121400-mceclip4.png\" width=\"1074\" height=\"604\"><\/div>\n<div>&nbsp;<\/div>\n<div>These oscillations also occurred in the CHARGE same as the FDTD results. (Fig 4.)<\/div>\n<div>&nbsp;<\/div>\n<div>I know that the simulation results show oscillations due to the resonance of light because the simulation structure has an ideal design.<\/div>\n<div>But, in the case of this simulation, it seems that the oscillations are out of the normal range.<\/div>\n<div>&nbsp;<\/div>\n<div>How can I suppress these oscillations in the simulation?<\/div>\n","protected":false},"template":"","class_list":["post-349035","topic","type-topic","status-closed","hentry","topic-tag-3DFDTD-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["27993","2592"],"_bbp_author_ip":["23.206.193.41"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["644"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["349035"],"_bbp_forum_id":["27833"],"_bbp_engagement":["2592","27993"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["349742"],"_bbp_last_active_id":["349742"],"_bbp_last_active_time":["2024-02-07 18:33:17"]},"test":"handonseas-harvard-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/349035","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\/349035\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=349035"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}