{"id":370150,"date":"2024-07-02T14:53:48","date_gmt":"2024-07-02T14:53:48","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/370150\/"},"modified":"2024-07-02T14:53:48","modified_gmt":"2024-07-02T14:53:48","slug":"370150","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/370150\/","title":{"rendered":"Reply To: Plane waves coupling to 2D plasmonic grating (space-time configuration)"},"content":{"rendered":"

<p class=”MsoNormal”>Hi,<\/p><p class=”MsoNormal”>I need some guidance of how to correctly setup a nonlinear optical model involving both FDTD and DEVICE. The answer may be in plain sight but it is hidden for a novice.<\/p><p class=”MsoNormal”>In FDTD, Two (2) CW optical sources are incident on plasmonic grating on GaAs substrate thus generating electron and hole pairs. The applied voltage between electrodes accelerates the charges. At the same time, other parameters of the DEVICE model are also in play (mobility, diffusion, recombination,…)<\/p><p class=”MsoNormal”>Nonlinearity is approached by modelling cyclic perturbations (optical source <span style=”font-family: Wingdings;”>à<\/span> e-h pairs, that are moved under the influence of DC voltage <span style=”font-family: Wingdings;”>à<\/span> change of index of refraction <span style=”font-family: Wingdings;”>à<\/span> impacting optical response).<\/p><p class=”MsoNormal”>I need to know how to correctly setup FDTD and DEVICE models.<\/p><\/p>\n

    <li class=”MsoListParagraph” style=”margin-left: 0in; mso-list: l0 level1 lfo1;”><span style=”mso-fareast-font-family: ‘Times New Roman’;”>FDTD generates e-h pairs by using the analysis script “CW generation rate“ in “Optoelectronics – CW generation rate” in Object Library <\/span><\/li>\n

    <li class=”MsoListParagraph” style=”margin-left: 0in; mso-list: l0 level1 lfo1;”><span style=”mso-fareast-font-family: ‘Times New Roman’;”>eh concentration is saved in “export file” name in (.mat) format. source intensity is set here.<\/span><\/li>\n

    <li class=”MsoListParagraph” style=”margin-left: 0in; mso-list: l0 level1 lfo1;”><span style=”mso-fareast-font-family: ‘Times New Roman’;”>DEVICE loads the e-h concentration under “CHARGE – Optical Generation Rate”. File name in (.mat) format.<\/span><\/li>\n

    <li class=”MsoListParagraph” style=”margin-left: 0in; mso-list: l0 level1 lfo1;”><span style=”mso-fareast-font-family: ‘Times New Roman’;”>DEVICE applies DC voltage specified under the “boundary conditions”. a charge monitor saves n-p data in a new (.mat) file.<\/span><\/li>\n

    <li class=”MsoListParagraph” style=”margin-left: 0in; mso-list: l0 level1 lfo1;”><span style=”mso-fareast-font-family: ‘Times New Roman’;”>In FDTD, “NPDensityGridAttribute” is added as analysis structure to import n-p concentration in (.mat) format. <\/span><\/li>\n

    <li class=”MsoListParagraph” style=”margin-left: 0in; mso-list: l0 level1 lfo1;”><span style=”mso-fareast-font-family: ‘Times New Roman’;”>In FDTD, the new material is added to include “np density”. The original material is replaced with a new one that uses “Drude model” to calculate change in the index of refraction.<\/span><\/li>\n

    <li class=”MsoListParagraph” style=”margin-left: 0in; mso-list: l0 level1 lfo1;”>FDTD –> DEVICE\/CHARGE –> FDTD –> DEVICE\/CHARGE is run in cycles till convergence is achieved.<\/li>\n<\/ol>\n

    <p class=”MsoNormal”>Does this setup guarantee full account of the intended nonlinear model?<\/p><p class=”MsoNormal”>Thanks,<\/p><p class=”MsoNormal”>Hamid Javadi<\/p><\/p>\n","protected":false},"template":"","class_list":["post-370150","reply","type-reply","status-publish","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