{"id":394927,"date":"2024-11-22T10:48:21","date_gmt":"2024-11-22T10:48:21","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394927\/"},"modified":"2024-11-22T10:48:21","modified_gmt":"2024-11-22T10:48:21","slug":"394927","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/394927\/","title":{"rendered":"Reply To: How to get rid of slab modes in EME solver"},"content":{"rendered":"<p>&lt;p&gt;Thanks for the reply.&lt;\/p&gt;&lt;p&gt;The polymer RI: 1.537 (height x width = 3x7um)&lt;\/p&gt;&lt;p&gt;The polymer cladding RI: 1.5045(throught the BC)&lt;\/p&gt;&lt;p&gt;Si: from database (0.3um x 0.5um), taper length is 10um&nbsp;&lt;\/p&gt;&lt;p&gt;Silica: 1.45 or 1.444 (throught the BC)&lt;\/p&gt;&lt;p&gt;BC: Metal (but I tried with PML already)&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I understand that the mode will couple more to the silicon. However, the slabs are away from the polymer, as you can see in the image, meaning they are not touching the polymer. So, the mode guided in the middle waveguide will couple to the polymer because it has the highest refractive index in that configuration. Do you agree? The slabs are 7um away from the taper tip.&lt;\/p&gt;&lt;p&gt;Indeed, I already tried the options you mentioned, but the coupling is still zero, even when I select the correct mode (or mode of interest).&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/22-11-2024-1732271554-mceclip2.png\" width=\"649\" height=\"312\" \/>&lt;\/p&gt;&lt;p&gt;Silicon side&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/22-11-2024-1732269039-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;Polymer side:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/22-11-2024-1732269436-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;EME setup:&nbsp;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/22-11-2024-1732271895-mceclip3.png\" width=\"510\" height=\"392\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/22-11-2024-1732272011-mceclip4.png\" width=\"519\" height=\"333\" \/>&lt;\/p&gt;&lt;p&gt;Maybe, something is wrong in the way I am calculating the s-matrix? or the Si slab should be even more distant than 7um?&lt;\/p&gt;&lt;p&gt;Thank you.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-394927","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Thanks for the reply.The polymer RI: 1.537 (height x width = 3x7um)The polymer cladding RI: 1.5045(throught the BC)Si: from database (0.3um x 0.5um), taper length is 10um Silica: 1.45 or 1.444 (throught the BC)BC: Metal (but I tried with PML already) I understand that the mode will couple more to the silicon. 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