{"id":315788,"date":"2023-11-08T14:19:49","date_gmt":"2023-11-08T14:19:49","guid":{"rendered":"\/forum\/forums\/topic\/3d-fdtd-simulation-with-1mw-dipole-and-nonlinear-chi2-material-not-stable\/"},"modified":"2023-11-20T15:34:25","modified_gmt":"2023-11-20T15:34:25","slug":"3d-fdtd-simulation-with-1mw-dipole-and-nonlinear-chi2-material-not-stable","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/3d-fdtd-simulation-with-1mw-dipole-and-nonlinear-chi2-material-not-stable\/","title":{"rendered":"3D FDTD simulation with 1mW dipole and nonlinear chi2 material not stable"},"content":{"rendered":"

I’m trying to simulate 1D photonic crystal (PhC) Nanobeam of GaAs in between SiO2 and a polymer and implement the nonlinear Pockels Chi2. The simulation seems to work for low powers, but for higher powers, light is no longer guided and radiates out of the photonic crystal. <\/p>\n

I’m using 2 electric dipoles in 3D FDTD with amplitude = 1e6, and base amplitude = 2.026464e-30, such that total amplitude = 2.02642e-24. I calculated power with “dipolesource” such that power = 1.5mW. I’m using very high resolution mesh, standard PML boundaries, 1.55um center wavelength<\/p>\n

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  1. Am I calculating the dipole powers correctly?<\/li>\n
  2. Do I need to change boundary conditions? e.g. metal?<\/li>\n<\/ol>\n

    Movie looks as follows: <\/p>\n","protected":false},"template":"","class_list":["post-315788","topic","type-topic","status-closed","hentry","topic-tag-Photoniccrystal-1","topic-tag-quasi-static-1","topic-tag-fdtd","topic-tag-nonlinear","topic-tag-question-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\n\t\t\n\t\t\n\t\t