{"id":395568,"date":"2024-11-27T14:36:23","date_gmt":"2024-11-27T14:36:23","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/metasurface-fdtdreflectivity-and-transmittance-is-greater-than-1-and-big-noise\/"},"modified":"2024-11-27T14:36:23","modified_gmt":"2024-11-27T14:36:23","slug":"metasurface-fdtdreflectivity-and-transmittance-is-greater-than-1-and-big-noise","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/metasurface-fdtdreflectivity-and-transmittance-is-greater-than-1-and-big-noise\/","title":{"rendered":"Metasurface FDTD:reflectivity and transmittance is greater than 1 and big noise"},"content":{"rendered":"<p>&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/27-11-2024-1732717592-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;I made Silicon metasurface and top silicon is for resonance and bottom silicon is for substrate.&lt;\/p&gt;&lt;p&gt;I simulate with 1100nm ~ 2200nm wavelength and I want to check about reflectivity and transmittance.&lt;\/p&gt;&lt;p&gt;Top Simulation PML &#8211; transmittance monitor &#8211; device &#8211; source &#8211; reflectivity monitor &#8211; bottom simulation PML -&gt; each interval is 10um&lt;br&gt;But, when I simulate it, reflectivity and transmittance was greater than 1. And there was big noise.&lt;br&gt;So, I increase simulate time and decrease auto shutoff and add PML layers to 32 with steep angle.&lt;br&gt;But, result was not change. And mesh was 10nm.&lt;br&gt;Can you help me about this problems?&lt;br&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/27-11-2024-1732717992-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/27-11-2024-1732718003-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/27-11-2024-1732718016-mceclip3.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/27-11-2024-1732718062-mceclip5.png\" \/>&lt;\/p&gt;&lt;p&gt;blue line is transmittance, green line is reflectivity.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-395568","topic","type-topic","status-publish","hentry","topic-tag-reflection-2","topic-tag-simulation","topic-tag-transient"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I made Silicon metasurface and top silicon is for resonance and bottom silicon is for substrate.I simulate with 1100nm ~ 2200nm wavelength and I want to check about reflectivity and transmittance.Top Simulation PML - transmittance monitor - device - source - reflectivity monitor - bottom simulation PML -&gt; each interval is 10umBut, when I simulate\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/metasurface-fdtdreflectivity-and-transmittance-is-greater-than-1-and-big-noise\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO 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