{"id":422961,"date":"2025-02-24T08:46:37","date_gmt":"2025-02-24T08:46:37","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issues-with-kerr-nonlinearities-in-lumerical-2\/"},"modified":"2025-02-24T08:46:37","modified_gmt":"2025-02-24T08:46:37","slug":"issues-with-kerr-nonlinearities-in-lumerical-2","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/issues-with-kerr-nonlinearities-in-lumerical-2\/","title":{"rendered":"Issues with Kerr nonlinearities in Lumerical"},"content":{"rendered":"<p>&lt;p&gt;Hello everyone.&lt;\/p&gt;&lt;p&gt;I have been trying to simulate Kerr nonlinearity in a ring Resonator in Lumerical MODE without success and I would appreciate some support in this regard. From my calculations I expect a value of Chi3 = 1e-18 [m^2\/V^2].&lt;\/p&gt;&lt;p&gt;I am using Chi3 Raman Kerr on top of InP &#8211; Palik and Chi3 = 1e-18 [m^2\/V^2] value.&lt;\/p&gt;&lt;p&gt;The simulation time of VarFDTD is 50000fs and I am injecting one Pump mode and one Signal mode corresponding to two of the allowed frequencies in the Ring resonator.&lt;\/p&gt;&lt;p&gt;The issue is that I am not able to observe any interaction given that value of Chi3. As soon as the Chi3 increases to an unphysical value such as Chi3 = 1e-6 I can see the expected nonlinear interaction.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Is there a coefficient to be kept into account when choosing the chi3 parameter in the material database?&lt;\/p&gt;&lt;p&gt;What could be the issue?&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Thanks in advance for your support&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-422961","topic","type-topic","status-publish","hentry","topic-tag-lumerical","topic-tag-material-nonlinearity-1","topic-tag-simulation"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27833"],"_bbp_topic_id":["422961"],"_bbp_subscription":["519995","3002"],"_bbp_author_ip":["131.155.237.47"],"_bbp_last_reply_id":["423605"],"_bbp_last_active_id":["423605"],"_bbp_last_active_time":["2025-02-27 15:47:53"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["519995","3002"],"_btv_view_count":["251"],"_bbp_topic_status":["unanswered"]},"test":"a-lechiaratue-nl"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/422961","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/422961\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=422961"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}