{"id":387321,"date":"2024-09-27T16:04:59","date_gmt":"2024-09-27T16:04:59","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/minimize-reflection-to-almost-0\/"},"modified":"2024-09-27T16:04:59","modified_gmt":"2024-09-27T16:04:59","slug":"minimize-reflection-to-almost-0","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/minimize-reflection-to-almost-0\/","title":{"rendered":"Minimize reflection to almost 0%"},"content":{"rendered":"<p>&lt;p&gt;Greetings,&lt;\/p&gt;&lt;p&gt;I am running a thin film analysis using the thin film lnP and I am trying to reach close to 100% transmission (&lt;0.1% reflection) at 1.5 um. I read that changing the film thickness can help you to acheive those results but when I change the thickness of the film, I see no changes in my transmission and refledtion plots. I changed thie thickness of the lnP rectangle z min to z max fron -0.18um through 0.18um to 0 to 0.1 um. Can anyone advice what&nbsp; I am doing wrong and how I may change the thickness of lnP rectangle to minimize my reflection? I attached my current plots and thickness values. Thank you in advance!&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/27-09-2024-1727452895-FDTD lnP a.PNG\" alt=\"\" width=\"573\" height=\"352\" \/>&lt;\/p&gt;&lt;p&gt;.<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/27-09-2024-1727452959-FDTD lnP b.PNG\" alt=\"\" width=\"560\" height=\"507\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-387321","topic","type-topic","status-publish","hentry","topic-tag-LumericalFDTD-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Greetings,I am running a thin film analysis using the thin film lnP and I am trying to reach close to 100% transmission (\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link 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