{"id":397339,"date":"2024-12-12T23:16:43","date_gmt":"2024-12-12T23:16:43","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/absorption-cross-section-of-aunr-excited-by-prism-based-tir\/"},"modified":"2024-12-12T23:16:43","modified_gmt":"2024-12-12T23:16:43","slug":"absorption-cross-section-of-aunr-excited-by-prism-based-tir","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/absorption-cross-section-of-aunr-excited-by-prism-based-tir\/","title":{"rendered":"Absorption cross-section of AuNR excited by prism-based TIR"},"content":{"rendered":"<p>&lt;p&gt;I am working on simulating the polarization-dependent absorption cross-section of a gold nanorod (AuNR) using Ansys Lumerical FDTD. The AuNR is excited by the evanescent field generated through prism-based total internal reflection (TIR).&lt;\/p&gt;&lt;p&gt;Here is the setup of my simulation:&lt;\/p&gt;<\/p>\n<ul>\n<li>A total-field scattered-field (TFSF) source is used with a 60-degree incident angle. The light first propagates through the air and then enters a prism (glass, &lt;span class=&#8221;katex&#8221;&gt;&lt;span class=&#8221;katex-mathml&#8221;&gt;n=1.52&lt;\/span&gt;&lt;\/span&gt;).<\/li>\n<li>The prism is placed on a glass substrate coated with a 140 nm indium tin oxide (ITO, n=1.96) layer.<\/li>\n<li>A single AuNR is deposited on the ITO layer and immersed in water (&lt;span class=&#8221;katex&#8221;&gt;&lt;span class=&#8221;katex-mathml&#8221;&gt;n=1.33&lt;\/span&gt;&lt;\/span&gt;).<\/li>\n<li>At the substrate interface, I expect an evanescent field to excite the plasmon resonance of the AuNR.<\/li>\n<\/ul>\n<p>&lt;p&gt;My goal is to calculate the absorption cross-section of the AuNR as a function of the polarization angle relative to its long axis.&lt;\/p&gt;&lt;p&gt;A key challenge I face is the large disparity in scales: the prism is on the microscale, while the AuNR is on the nanoscale. Is it feasible to include both the prism and the AuNR in a single simulation domain? If so, how should I approach setting up such a simulation to ensure accurate results?&lt;\/p&gt;&lt;p&gt;I would greatly appreciate your insights and guidance.&lt;\/p&gt;&lt;p&gt;Best regards,&lt;br&gt;Katsu&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/12-12-2024-1734045388-FDTD_setup.png\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-397339","topic","type-topic","status-publish","hentry","topic-tag-evanescentwave","topic-tag-LumericalFDTD-1","topic-tag-nanoparticles","topic-tag-TFSF-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am working on simulating the polarization-dependent absorption cross-section of a gold nanorod (AuNR) using Ansys Lumerical FDTD. 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The light first propagates through\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/absorption-cross-section-of-aunr-excited-by-prism-based-tir\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Absorption cross-section of AuNR excited by prism-based TIR | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am working on simulating the polarization-dependent absorption cross-section of a gold nanorod (AuNR) using Ansys Lumerical FDTD. The AuNR is excited by the evanescent field generated through prism-based total internal reflection (TIR).Here is the setup of my simulation:A total-field scattered-field (TFSF) source is used with a 60-degree incident angle. The light first propagates through\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/absorption-cross-section-of-aunr-excited-by-prism-based-tir\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-12-12T23:16:43+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-12-12T23:16:43+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Absorption cross-section of AuNR excited by prism-based TIR | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I am working on simulating the polarization-dependent absorption cross-section of a gold nanorod (AuNR) using Ansys Lumerical FDTD. 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