{"id":368066,"date":"2024-05-22T13:02:11","date_gmt":"2024-05-22T13:02:11","guid":{"rendered":"\/forum\/forums\/topic\/band-structure-simulation-fdtd\/"},"modified":"2024-05-22T13:20:15","modified_gmt":"2024-05-22T13:20:15","slug":"band-structure-simulation-fdtd","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/band-structure-simulation-fdtd\/","title":{"rendered":"Band structure simulation FDTD"},"content":{"rendered":"

Hi,<\/p>\n

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I am trying to get a graph like below from a reference paper.<\/p>\n

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If this graph is correct my difference in effective index of first and fundamental order mode is around 0.013. I am trying to do the simulation given in this one https:\/\/www.lumerical.com\/learn\/video\/swg-bandstructures\/ . My k vector points at 222 nm pitch and 8 um wide SWG unit cell was found to be around 0.306 for fundamental mode and 0.29 for the first order mode. I gave k vector range around 0.27- 0.32. The effective index calculation differs so much, even if i tried sweeping for 10, 50,100,500 points. What can be the possible issue for the huge effective index, is it the range of f1 and f2 provided or is it the range of k vector values? I did all the simulation by keeping 10 nm mesh size. I haave attached the band diagram and the simulation file as well.<\/p>\n

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https:\/\/drive.google.com\/file\/d\/1BdtTeoE0gD9E_uPQyTD2py2o_nWDIagy\/view?usp=sharing<\/p>\n","protected":false},"template":"","class_list":["post-368066","topic","type-topic","status-closed","hentry","topic-tag-3DFDTD-1","topic-tag-bandstructure-1","topic-tag-effectiveindex-1","topic-tag-lumerical","topic-tag-LumericalFDTD-1","topic-tag-script","topic-tag-simulation"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t