{"id":396713,"date":"2024-12-09T05:11:26","date_gmt":"2024-12-09T05:11:26","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fde-simulation-region-and-loss-change-in-mode\/"},"modified":"2024-12-09T05:19:02","modified_gmt":"2024-12-09T05:19:02","slug":"fde-simulation-region-and-loss-change-in-mode","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fde-simulation-region-and-loss-change-in-mode\/","title":{"rendered":"FDE simulation region and loss change in MODE"},"content":{"rendered":"<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;Hello, I am studying <strong>hybridized modes between slab and buried waveguides<\/strong>.&lt;\/p&gt;&lt;p&gt;During the process of setting the FDE simulation region, I noticed that the loss changes drastically depending on the simulation region, even when all other conditions remain the same.&lt;\/p&gt;&lt;p&gt;Since most of the loss is caused by slab modes (due to coupling with slab modes), I believe this phenomenon is plausible.&lt;\/p&gt;&lt;p&gt;However, at the same time, I suspect it may be an inaccurate result.&lt;\/p&gt;&lt;p&gt;<strong>Do you have any suggestions on how to resolve this issue?<\/strong>&lt;\/p&gt;&lt;div class=&#8221;flex max-w-full flex-col flex-grow&#8221;&gt;&lt;div class=&#8221;min-h-8 text-message flex w-full flex-col items-end gap-2 whitespace-normal break-words text-start [.text-message+&amp;]:mt-5&#8243; dir=&#8221;auto&#8221; data-message-author-role=&#8221;assistant&#8221; data-message-id=&#8221;bd9eba57-cdfd-449c-abe1-a38a0ca80d72&#8243; data-message-model-slug=&#8221;gpt-4o-canmore&#8221;&gt;&lt;div class=&#8221;flex w-full flex-col gap-1 empty:hidden first:pt-[3px]&#8221;&gt;&lt;div class=&#8221;markdown prose w-full break-words dark:prose-invert light&#8221;&gt;&lt;p&gt;I would really appreciate it if you could help me.&lt;\/p&gt;&lt;\/div&gt;&lt;\/div&gt;&lt;\/div&gt;&lt;\/div&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n<ul>\n<li>I set my simulation region with PML boundaries (default condition). (for hybridized mode with upper slab and lower buried waveguide)&nbsp;<\/li>\n<li>If I span simulation region(along y axis) to 5*core width, 6*core width, 7*core width -&gt; I found that the loss changes to 6.3051dB\/cm, 4.36dB\/cm, 31.9dB\/cm.&nbsp;&nbsp;<\/li>\n<\/ul>\n<p>&lt;p&gt;&lt;p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/09-12-2024-1733720643-mceclip0.png\" \/>&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-396713","topic","type-topic","status-publish","hentry","topic-tag-core-loss","topic-tag-dielectric-waveguide","topic-tag-FDE-1","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=\"Hello, I am studying hybridized modes between slab and buried waveguides.During the process of setting the FDE simulation region, I noticed that the loss changes 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