{"id":167616,"date":"2022-03-23T03:37:13","date_gmt":"2022-03-23T03:37:13","guid":{"rendered":"\/forum\/forums\/topic\/how-to-get-farfield-projection-for-periodic-structure\/"},"modified":"2022-05-03T21:18:03","modified_gmt":"2022-05-03T21:18:03","slug":"how-to-get-farfield-projection-for-periodic-structure","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-get-farfield-projection-for-periodic-structure\/","title":{"rendered":"How to get farfield projection for periodic structure?"},"content":{"rendered":"
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Hi,<\/p>\n

According to this page<\/a>, using farfield3D on a single unit cell of a periodic structure will result in significant diffraction artifacts. It states that, if the structure is infinitely periodic, then 'Grating Projection' functions should be used. However, it is not clear to me which grating functions one should use to get a 2D field intensity profile for the far field. 'grating' only returns fraction of power in each beam, so cannot be used to get a 2D color plot of the field profile. Could you let me know which grating functions are equivalent to the 'farfield3D' function, which can be used to plot a 2D color map of the field intensity together with farfieldux and farfielduy? Or is the only option to include several periods within the FDTD region rather than just 1 and use the farfield3D function then? Thank you in advance.<\/p>\n","protected":false},"template":"","class_list":["post-167616","topic","type-topic","status-closed","hentry","topic-tag-farfield-2","topic-tag-fdtd","topic-tag-gratings-farfield-2","topic-tag-LumericalFDTD-1","topic-tag-photonics"],"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