{"id":286374,"date":"2023-05-30T15:14:00","date_gmt":"2023-05-30T15:14:00","guid":{"rendered":"\/forum\/forums\/topic\/fdtd-simulations\/"},"modified":"2023-06-05T13:05:12","modified_gmt":"2023-06-05T13:05:12","slug":"fdtd-simulations","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fdtd-simulations\/","title":{"rendered":"FDTD Simulations"},"content":{"rendered":"

Hello,<\/p>\n

I am a PhD student and my research group is working with FDTD simulations to plot the far-field from a dipole source inside a thin film structure. However, we are having difficulties with plotting\/interpreting the extracted far-field data. Accordingly, we have a few questions regarding this:<\/p>\n

Primarily, we want to recreate the polar plot of the 3D far-field using that can be seen using the visualizer inside the FDTD software using OriginLab software. For example, this image is taken from the visualizer:<\/p>\n

<\/p>\n

We have converted the ux and uy data to values of theta and phi using the script at the bottom of this webpage from the Ansys website: https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034410194-farfieldspherical-Script-command<\/a><\/p>\n

However, we have some confusion about the interpretation of these values.<\/p>\n

    \n
  1. From the output of this script, the values of theta range of from -90 to 90. As described here: Understanding direction unit vector coordinates in far field projections – Ansys Optics<\/a> the fields are calculated on a hemispherical surface located 1 meter away from the simulation region, and the range of theta is from 0 to 180 degrees (0 to pi radians). Why then does script give values from -90 to 90 for theta and what is the physical location of the values from -90 to 0 on the hemisphere\/polar plot?<\/li>\n
  2. In general, what is the proper way to extract this data and plot in a polar plot in an external software like OriginLab?<\/li>\n<\/ol>\n

    Thank you!”<\/p>\n","protected":false},"template":"","class_list":["post-286374","topic","type-topic","status-closed","hentry"],"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