{"id":366778,"date":"2024-05-14T14:15:20","date_gmt":"2024-05-14T14:15:20","guid":{"rendered":"\/forum\/forums\/topic\/mode-expansion-monitor-uses-in-vardfdtd-solver\/"},"modified":"2024-05-14T14:15:20","modified_gmt":"2024-05-14T14:15:20","slug":"mode-expansion-monitor-uses-in-vardfdtd-solver","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mode-expansion-monitor-uses-in-vardfdtd-solver\/","title":{"rendered":"Mode expansion Monitor uses in VardFDTD solver"},"content":{"rendered":"

Hi,
I want to export VarFDTD results to Interconnect for that I used mode expansion monitor as shown in the example https:\/\/optics.ansys.com\/hc\/en-us\/articles\/360034902433-Using-and-understanding-Mode-Expansion-Monitors
But I am getting weird results of s-parameters (S11 and S21). I just edited the “analysis program” given in the ring resonator example but it doesn’t work. I used following code:<\/p>\n

•<\/span><\/span>in = <\/span>getresult<\/span>(“<\/span>mode_expansion”,”expansion<\/span> for in”);<\/span><\/div>\n
•<\/span><\/span>drop1 = <\/span>getresult<\/span>(“<\/span>mode_expansion”,”expansion<\/span> for output1″);
<\/span><\/div>\n
•<\/span><\/span>S11 = S22 = S33 = <\/span>in.b<\/span>\/<\/span>in.a<\/span>;<\/span><\/div>\n
•<\/span><\/span>S21 = S12 = drop1.a\/<\/span>in.a<\/span>;<\/span><\/div>\n
•<\/span><\/span>S = <\/span>matrixdataset<\/span>;<\/span><\/div>\n
•<\/span><\/span>S.addparameter<\/span>(“f”,in.f,”lambda”,<\/span>in.lambda<\/span>);<\/span><\/div>\n
•<\/span><\/span>S.addattribute<\/span>(“S11”,S11);<\/span><\/div>\n
•<\/span><\/span>S.addattribute<\/span>(“S21”,S21);
<\/span><\/div>\n
•<\/span><\/span># export to file for INTERCONNECT<\/span><\/div>\n
•<\/span><\/span>Sdata<\/span> = [<\/span>S.f<\/span>, abs(S11), unwrap(angle(S11)), abs(S21), unwrap(angle(S21))];<\/span><\/div>\n

 <\/p>\n

•<\/span><\/span>if(<\/span>fileexists<\/span>(filename)) { rm(filename); }<\/span><\/div>\n
•<\/span><\/span>format long;<\/span><\/div>\n
•<\/span><\/span>write(filename,num2str(<\/span>Sdata<\/span>));<\/span><\/div>\n
 <\/div>\n
I am attaching the stucture, monitor results, mode expansion monitor settings, s-parameters and link to Lumerical file in the attachment. Please look into the files and suggest me the required changes.<\/span><\/div>\n
\"\"<\/span><\/div>\n
 <\/div>\n

\"\"attachment. \"\"<\/p>\n

https:\/\/drive.google.com\/file\/d\/1_I8dGlpuyr8Kn56II0ZX4Et77FEWZEJd\/view?usp=drive_link<\/a><\/p>\n

Looking forward to your reply!!<\/p>\n

Thanks in advance!!<\/p>\n

Prateeksha<\/p>\n","protected":false},"template":"","class_list":["post-366778","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