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<\/p>\nHi,<\/p>\n
I am simulating a library of pillars with RCWA following the example of Lumerical (https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360042097313-Small-Scale-Metalens-Field-Propagation). Here is the picture of my simulation<\/p>\n
<\/p>\n
The unitcell is subwavelength, so only the (0,0) order is dominant. <\/p>\n
Since I am interested in the phase of the plane wave after the pillar I can either use the RCWAFieldMonitor positioned at a specific heigth from the pillar and take the phase of the field in the middle of the monitor. Otherwise I can use the values of the scattering matrix as in the example of lumerical: <\/p>\n
grating_characterization = getresult(“RCWA”,”grating_characterization”);<\/p>\n
n = find(grating_characterization.n, 0); # n index of 0th order
m = find(grating_characterization.m, 0); # m index of 0th order<\/p>\n
STpp(:) = pinch(grating_characterization.Tpp(:,1,n,m));<\/p>\n
phase_Ep = angle(STpp);<\/p>\n
My problem with this method is that I do not know at with distance from the pillar the phase is taken. While with RCWAfieldmonitor I know at which z I put the monitor, the scattering matrix method just gives me a value of the phase. I have three possible interpretation for phase_Ep: phase_Ep is the phase at the last RCWA interference defined (therefore the end of the pillar), phase_Ep is the phase of the field at the top boundary of the RCWA simulation region or phase_Ep is the phase of the field at “infinity”. I tried to look for documentation but I was not able to find an answer. <\/p>\n
To summurize: at which heigth in the simulation region is the phase extracted via the scattering matrix S defined? <\/p>\n","protected":false},"template":"","class_list":["post-369976","topic","type-topic","status-closed","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\n\t\t\n\t\t\n\t\t