{"id":358501,"date":"2024-03-22T14:44:46","date_gmt":"2024-03-22T14:44:46","guid":{"rendered":"\/forum\/forums\/topic\/how-to-do-phase-wrapping\/"},"modified":"2024-03-22T14:44:46","modified_gmt":"2024-03-22T14:44:46","slug":"how-to-do-phase-wrapping","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-do-phase-wrapping\/","title":{"rendered":"How to do ‘Phase Wrapping’?"},"content":{"rendered":"

I wanted to reproduce the phase figures from Decker et al. (Adv. Optical Mat., 2015)<\/a> article:<\/p>\n

<\/a><\/p>\n

I was given something similar by using the ‘s_grating_components’ script, present in this model<\/a>:<\/p>\n

\"\"<\/a><\/p>\n

With this one being the unwrapped graph. Using f() = angle()<\/em> I get this graph, which is the ‘wrapped’ version:<\/p>\n

<\/a><\/p>\n

My intention was to accommodate the upper graph to the range of the latter (so I can have a realistic phase characteristic with [pi,-pi] limits). To do so, I was suggested to use an approximation basing myself over the ‘center frequency’. I guessed to use this own-made MATLAB script:<\/p>\n

<\/p>\n

Where the term ‘pi\/2’ serves as a y-axis correction. It depends on where is your final graph located at. Using it, I have been able to plot something like this:<\/p>\n

<\/p>\n

Which is somehow better, but still gets outside the real phase limits, and that is something I cannot tolerate because it lacks physical meaning. Is this script correct? Can Lumerical implement it without getting out of it?<\/p>\n

Besides this, <\/strong>using this simulation I find a shift in phase (you can see this as in the reference picture the middle-point of the phase gets at 1200 nm, meanwhile in my case I find this point at 1300 nm), which I don’t see why happens as my model is identical to that of the article. <\/p>\n

Hope you can answer both questions. Appreciate your help. <\/p>\n","protected":false},"template":"","class_list":["post-358501","topic","type-topic","status-closed","hentry","topic-tag-metasurface-1","topic-tag-mie-theory-2","topic-tag-phase-change","topic-tag-scattering-matrix-2"],"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