{"id":295376,"date":"2023-07-28T14:53:37","date_gmt":"2023-07-28T14:53:37","guid":{"rendered":"\/forum\/forums\/topic\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\/"},"modified":"2023-07-28T14:53:37","modified_gmt":"2023-07-28T14:53:37","slug":"difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\/","title":{"rendered":"Difference between chi3(\/chi2) with only chi3 and Kerr nonlinear material"},"content":{"rendered":"<p>I need to check response of a dielectric film considering only third order nonlinearity. It seems there is two way to define it. <br \/>1)chi3\/chi2 material &#8211;&gt; only chi3 has nonzero value (e.g. 1e-19) and base material is defined seperately with a (n,k) material with n=4,k=0 (no loss);<\/p>\n<p>2)kerr nonlinear &#8211;&gt; permittivity =16, chi3= 1e-19.<\/p>\n<p>As I ran the 2D sim with a plane wave source and sweeped the amplitude (E0), the T response was different. Here is a plot for a film thickness of 125nm.<br \/><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/28-07-2023-1690555952-mceclip0.png\"><br \/>Can anyone help me understand the difference in dynamics of these two material types? Thanks.<\/p>\n","protected":false},"template":"","class_list":["post-295376","topic","type-topic","status-closed","hentry","topic-tag-fdtd","topic-tag-nonlinear-analysis"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I need to check response of a dielectric film considering only third order nonlinearity. It seems there is two way to define it. 1)chi3\/chi2 material --&gt; only chi3 has nonzero value (e.g. 1e-19) and base material is defined seperately with a (n,k) material with n=4,k=0 (no loss);2)kerr nonlinear --&gt; permittivity =16, chi3= 1e-19.As I ran\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\/\" \/>\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=\"Difference between chi3(\/chi2) with only chi3 and Kerr nonlinear material | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I need to check response of a dielectric film considering only third order nonlinearity. It seems there is two way to define it. 1)chi3\/chi2 material --&gt; only chi3 has nonzero value (e.g. 1e-19) and base material is defined seperately with a (n,k) material with n=4,k=0 (no loss);2)kerr nonlinear --&gt; permittivity =16, chi3= 1e-19.As I ran\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/28-07-2023-1690555952-mceclip0.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/28-07-2023-1690555952-mceclip0.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-07-28T14:53:37+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-28T14:53:37+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Difference between chi3(\/chi2) with only chi3 and Kerr nonlinear material | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"I need to check response of a dielectric film considering only third order nonlinearity. It seems there is two way to define it. 1)chi3\/chi2 material --&gt; only chi3 has nonzero value (e.g. 1e-19) and base material is defined seperately with a (n,k) material with n=4,k=0 (no loss);2)kerr nonlinear --&gt; permittivity =16, chi3= 1e-19.As I ran\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/28-07-2023-1690555952-mceclip0.png\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/nonlinear-analysis\\\/#listItem\",\"name\":\"nonlinear-analysis\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/nonlinear-analysis\\\/#listItem\",\"position\":3,\"name\":\"nonlinear-analysis\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/nonlinear-analysis\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\\\/#listItem\",\"name\":\"Difference between chi3(\\\/chi2) with only chi3 and Kerr nonlinear material\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\\\/#listItem\",\"position\":4,\"name\":\"Difference between chi3(\\\/chi2) with only chi3 and Kerr nonlinear material\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/nonlinear-analysis\\\/#listItem\",\"name\":\"nonlinear-analysis\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/difference-between-chi3-chi2-with-only-chi3-and-kerr-nonlinear-material\\\/\",\"name\":\"Difference between chi3(\\\/chi2) with only chi3 and Kerr nonlinear material | Ansys Learning Forum\",\"description\":\"I need to check response of a dielectric film considering only third order nonlinearity. 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