{"id":378180,"date":"2024-08-13T16:37:06","date_gmt":"2024-08-13T16:37:06","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/378180\/"},"modified":"2024-08-13T16:37:06","modified_gmt":"2024-08-13T16:37:06","slug":"378180","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/378180\/","title":{"rendered":"Reply To: Simulation of absorptivity of polymers"},"content":{"rendered":"<p>&lt;p&gt;Thank you for your answer.&lt;\/p&gt;&lt;p&gt;1\u3001I learned that the PTFE thickness is in the millimeter level, is a single substance, there is no SiO2.&lt;br&gt;2\u3001In my eyes, PTFE is an insulator, should be regarded as a pure dielectric, I did not see in the paper there is a imaginary part of its refractive index (in terahertz band\uff0crefractive index of about 1.4, dielectric constant of about 2) (I am not familiar with this knowledge, please forgive my wrong expression).&lt;br&gt;3\u3001What bothers me is that PTFE is pure white and SiO2 (quartz glass) is transparent in real life, but their refractive indices are close (resulting in the reflectivity calculated by me using Fresnel&#8217;s formula is also close).&lt;br&gt;I wonder if my material model was applied incorrectly, or if the FDTD method is not suitable for simulation\u3002&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-378180","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Thank you for your answer.1\u3001I learned that the PTFE thickness is in the millimeter level, is a single substance, there is no SiO2.2\u3001In my eyes, PTFE is an insulator, should be regarded as a pure dielectric, I did not see in the paper there is a imaginary part of its refractive index (in terahertz band\uff0crefractive\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link 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