{"id":302613,"date":"2023-08-21T21:39:16","date_gmt":"2023-08-21T21:39:16","guid":{"rendered":"\/forum\/forums\/topic\/second-harmonic-generation-and-phase-information\/"},"modified":"2023-08-22T14:54:26","modified_gmt":"2023-08-22T14:54:26","slug":"second-harmonic-generation-and-phase-information","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/second-harmonic-generation-and-phase-information\/","title":{"rendered":"Second harmonic generation, selection rule and phase information?"},"content":{"rendered":"<p>Hi,&nbsp;<\/p>\n<p>I am trying to study geometric phase in non linear optical process. For example:<\/p>\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1002\/adom.201902050\">Nonlinear Wavefront Control by Geometric\u2010Phase Dielectric Metasurfaces: Influence of Mode Field and Rotational Symmetry &#8211; Liu &#8211; 2020 &#8211; Advanced Optical Materials &#8211; Wiley Online Library<\/a><\/p>\n<p>Essentialy we have a wave and a non linear material with different shape and we study the phase of the second harmonic wave (with different polarizations) as a function of the rotation of the material.&nbsp;<\/p>\n<p>My question is: how much is reliable Ansys to study a problem like this?<\/p>\n<p>For example I am testing selection rule for non linear optical process:<\/p>\n<p>&nbsp;<\/p>\n<p><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/22-08-2023-1692715440-NonLinear.PNG\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/22-08-2023-1692715440-NonLinear.PNG\" alt=\"\"><\/a><\/p>\n<p>I have a material with C2 symmetry. The fundamental wave has right circular polarization (RCP).&nbsp; For the harmonic order n=1 I have the same results of the theory, no wave with RCP and a generated wave with LCP with the phase indicated, where theta is the rotation angle of the metastructure.&nbsp;<\/p>\n<p>But If I study the spectrum for the other orders with a initial wavelength of 1200 nm:<\/p>\n<p><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/22-08-2023-1692715713-Spectrum.PNG\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/22-08-2023-1692715713-Spectrum.PNG\" alt=\"\"><\/a><\/p>\n<p>I see that there is also the harmonic order n=2 that is not expected considering the theory.&nbsp;<\/p>\n<p>Are there any suggestions?<\/p>\n","protected":false},"template":"","class_list":["post-302613","topic","type-topic","status-closed","hentry","topic-tag-2dmaterialsandmetals-1","topic-tag-material-nonlinearity-1","topic-tag-optics","topic-tag-photonics"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi, I am trying to study geometric phase in non linear optical process. 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