{"id":387799,"date":"2024-10-02T10:49:00","date_gmt":"2024-10-02T10:49:00","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hfss-transmission-in-rf-ir-and-visible\/"},"modified":"2024-10-02T10:49:00","modified_gmt":"2024-10-02T10:49:00","slug":"hfss-transmission-in-rf-ir-and-visible","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/hfss-transmission-in-rf-ir-and-visible\/","title":{"rendered":"HFSS Transmission in RF, IR and Visible"},"content":{"rendered":"<p>&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I chose to simulate metasurface designs in HFSS as it provided experimentally verified simulation results in the RF. Now, I want to expand my simulation range to cover the IR and visible regimes too.&lt;\/p&gt;&lt;p&gt;When I&#8217;m doing this, the transmission values I am getting appear to include large amounts of thin film interference, which I do not see in my experimental results. I am using two periodic boundary conditions, floquet ports above and below (with 5um gap between my structure and port), custom materials based on conductivity values, and a driven solution mode. The maximum pitch of my periodc structures is 1mm. Do I need to take into account some other considerations when moving into the IR and visible regimes with HFSS?&nbsp;&lt;\/p&gt;&lt;p&gt;In adition, the simulation time increases substationally when moving to the higher freuqnecies. I did expect this as the mesh size used will be smaller. I should note I am using three individual studies with the adaptive pass \/ meshing frequency set to the highest value in each study. Example: study 1 goes from 1-15 GHz and so adaptive pass frequency is 15 GHz. How could I ensure that I speed up simulations without losing out on accuracy?&lt;\/p&gt;&lt;p&gt;Many thanks in advance, Tom.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-387799","topic","type-topic","status-publish","hentry","topic-tag-hfss","topic-tag-infrared","topic-tag-rf-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,I chose to simulate metasurface designs in HFSS as it provided experimentally verified simulation results in the RF. 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