{"id":391935,"date":"2024-10-30T09:23:55","date_gmt":"2024-10-30T09:23:55","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-in-bandstructure-simulation\/"},"modified":"2024-10-30T09:23:55","modified_gmt":"2024-10-30T09:23:55","slug":"help-in-bandstructure-simulation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-in-bandstructure-simulation\/","title":{"rendered":"Help in bandstructure simulation"},"content":{"rendered":"

<p dir=”ltr”>Hi <\/p><p dir=”ltr”>I need help with the bandstructure simulations.. I tried to download two examples and do some changes to suit “ my structure” but I am not getting reasonable results.. I am trying to reproduce a published paper result. <\/p><p dir=”ltr”> Firstly, I tried to solve the problem using the Lumerical “mode” software. I followed up the following example:<\/p><p dir=”ltr”>https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042039033-Bandstructure-of-planar-photonic-crystal-with-a-square-lattice-varFDTD<\/a><\/p><p> <\/strong><\/p><p dir=”ltr”>My structure is a 1D photonic crystal which consists of a waveguide with one of its side walls looks like a sinusoidal wave. <\/p><p dir=”ltr”>So, after importing the structure, I changed the boundary conditions to be pml  in the y-direction, while keeping Bloch boundary condition in the x direction and I give the normalized  kx=0.25<\/p><p dir=”ltr”>Based on https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360041566614-Rectangular-Photonic-Crystal-Bandstructure<\/a><\/p><p> <\/strong><\/p><p dir=”ltr”>k _norm =k_SI * a \/2\/pi<\/p><p> <\/strong><\/p><p dir=”ltr”>k_SI=2pi\/lambda, lambda=1550nm<\/p><p dir=”ltr”>a=400nm<\/p><p> <\/strong><\/p><p dir=”ltr”> However whenever I run the program it gives me the window that the program is “updating slab modes” and it  stucks.why?<\/p><p> <\/strong><\/p><p dir=”ltr”>Second, I tried to solve the problem with FDTD and I followed the following example:<\/p><p dir=”ltr”>https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042038473-Bandstructure-of-photonic-crystal-waveguide-Line-defect<\/a> with the same changes that I mentioned above<\/p><p dir=”ltr”> And here’s what I got when I run the Gamma-X sweep from 0-1 <\/p><p dir=”ltr”><\/p><p dir=”ltr”>I tried to do many changes in the apodization width and center, to change the kx , changing frequencies ..etc. But all my trials doen’t help.<\/p><p dir=”ltr”>So what are the possible changes that I can do to obtain a clear bandstrure? <\/p><p> <\/p><\/p>\n","protected":false},"template":"","class_list":["post-391935","topic","type-topic","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