Hello everyone, I’m trying to get some decent transmissions through a 2D grating coupler.
Starting with the basic introductory file found at https://kb.lumerical.com/en/pic_passive_grating_coupler_2d.html , I am trying to couple some light in the visible range (400-700nm) that is perfectly normal to the grating coupler. However when the light is normal to the surface, the back reflections are huge.
After doing some research I’ve found that some authors have modified the grating coupler pitch and duty cycle to have additional in-between structures. I’m trying to modify my GC to mimic those structures, but I’m not sure how to add my own custom patterns in the Edit Object menu. I’ve tried doing the Add option but I can’t seem to get anything physical to show up. Any tips on customizing our grating?
Also, I’m desperately in need of more tutorial vids like the one found in the above link. Does anyone have any recommendations?
All the best,