{"id":359858,"date":"2024-04-01T16:01:43","date_gmt":"2024-04-01T16:01:43","guid":{"rendered":"\/forum\/forums\/topic\/grating-coupler-double-etch-optimization-using-gradient-based-inverse-design\/"},"modified":"2024-04-01T16:01:43","modified_gmt":"2024-04-01T16:01:43","slug":"grating-coupler-double-etch-optimization-using-gradient-based-inverse-design","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/grating-coupler-double-etch-optimization-using-gradient-based-inverse-design\/","title":{"rendered":"Grating Coupler Double Etch Optimization using Gradient Based Inverse Design"},"content":{"rendered":"<p>I am currently following the sample tutorial: Inverse Design of Grating Coupler (2D). This tutorial only offers optimization of a single etch depth, and I would like to expand this simulation to 2-step etching to see if this can help further improve the efficiency of the inversely designed grating coupler.&nbsp;<\/p>\n<p>My current approach is by expanding the params array from 2<em>n_grates to 4<\/em>n_grates, where the first two elements represent the width of each tooth and the next two elements represent etch depth. I plug these four elements into verts. However, there are two problems with this approach. The etch depth is limited by the same minimum feature constraint I set for the tooth width, which is not applicable to the etch depth. Second, I cannot have a varying etch depth as it will not be possible to fabricate. The etch depth must take on one of the two values: full or half etch. So I&#8217;m wondering what is the approach to set bounds to this optimization.<\/p>\n<p>I have attached the current result of my simulation. The optimization process terminates at iteration 7, and it&#8217;s not hard to see that it is probably terminating due to extremely low FOM. Any help is appreciated, thanks!<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/01-04-2024-1711987278-optimization7.png\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-359858","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am currently following the sample tutorial: Inverse Design of Grating Coupler (2D). This tutorial only offers optimization of a single etch depth, and I would like to expand this simulation to 2-step etching to see if this can help further improve the efficiency of the inversely designed grating coupler. My current approach is by expanding\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/grating-coupler-double-etch-optimization-using-gradient-based-inverse-design\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Grating Coupler Double Etch Optimization using Gradient Based Inverse Design | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"I am currently following the sample tutorial: Inverse Design of Grating Coupler (2D). 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