{"id":392968,"date":"2024-11-06T12:27:10","date_gmt":"2024-11-06T12:27:10","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/illumination-with-an-incident-angle-greater-than-0-fdtd\/"},"modified":"2024-11-06T12:27:10","modified_gmt":"2024-11-06T12:27:10","slug":"illumination-with-an-incident-angle-greater-than-0-fdtd","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/illumination-with-an-incident-angle-greater-than-0-fdtd\/","title":{"rendered":"Illumination with an incident angle greater than 0\u00b0 FDTD"},"content":{"rendered":"

<p>Dear all,<\/p><p>I hope you are doing well. I have some issues regarding the illumination of a metasurface with an incident angle greater than 0° with FDTD.<\/p><p>To be more specific, the metasurface under test is a 2D grating that I previously simulated with Lumerical RCWA, with an incident angle of 45° and P polarization.<\/p><p>Of course with RCWA i got the R\/T spectra that I expected however I cannot figure out how to set the same simulation with FDTD.<\/p><p>In particular my main doubts are:<\/p><p>1) Which kind of boundary conditions should I use to ensure still the periodicity (along the x direction) but taking into account the illumnation angle ad the P polarization?<\/p><p>2) What kind of plane wave source should I set?<\/p><p>Thank you in advance.<\/p><p>Best Regards<\/p><p> <\/p><p>Giovanni<\/p><\/p>\n","protected":false},"template":"","class_list":["post-392968","topic","type-topic","status-publish","hentry","topic-tag-LumericalFDTD-1","topic-tag-metasurface-1","topic-tag-periodic-bc-1"],"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