{"id":305432,"date":"2023-09-08T01:34:20","date_gmt":"2023-09-08T01:34:20","guid":{"rendered":"\/forum\/forums\/topic\/3d-fdtd-farfield-imaging-optics\/"},"modified":"2023-09-08T01:34:20","modified_gmt":"2023-09-08T01:34:20","slug":"3d-fdtd-farfield-imaging-optics","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/3d-fdtd-farfield-imaging-optics\/","title":{"rendered":"3D FDTD, Farfield, Imaging optics"},"content":{"rendered":"
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What I want is to compare the shape of the image reduced and enlarged by magnification with the reference. The explanation below is related to my setup, but I wonder if there is a better way than this, and I want to know if there is a problem with my setup.<\/div>\n
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Description: I designed a lens with a focal length of 25 um and designed it as shown in the figure to evaluate the performance of the imaging optical system. The distance between the object and the lens is separated by the focal length f, and we want to view a 2D electric field image in a farfieldexact3d script at a distance of f+f*M (magnification) after the lens (e.g., X,Y image plot at the Z-axis 11*f position)<\/div>\n
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Should I write another farfield script?<\/div>\n
Should the location of the monitor and source be modified? <\/div>\n
It’s currently set to PML, can I use symmetric?<\/div>\n
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Any help would be appreciated.<\/div>\n
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and this is my script, when M is 400: <\/p>\n

mname = “DFTMonitor”;<\/p>\n

num = 100;<\/p>\n

x = linspace(-1e-3, 1e-3, num);<\/p>\n

y = linspace(-1e-3, 1e-3, num);<\/p>\n

z = 10e-3;<\/p>\n

E = farfieldexact3d(mname, x, y, z, {“field”:”E”});<\/p>\n

Ex = pinch(E, 4, 1);<\/p>\n

Ey = pinch(E, 4, 2);<\/p>\n

Ez = pinch(E, 4, 3);<\/p>\n

E2 = abs(Ex)^2 + abs(Ey)^2 + abs(Ez)^2;<\/p>\n

image(x*1e3, y*1e3, E2, “x (mm)”, “y (mm)”, “abs(E)^2”);<\/p>\n

 <\/p>\n<\/div>\n<\/div>\n

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 <\/p>\n","protected":false},"template":"","class_list":["post-305432","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