Photonics

Photonics

Topics related to Lumerical and more.

How to measure transmission coefficients on a given plane .

    • uzmayaqoob1960
      Subscriber

      In the attached picture i am interested to find |tx|^2 and |ty|2 from the simulated results attached below .The very first top right image is when x-pol is shine then directly observing monitor with any selection of X and Y components we got this image.When we choose selection operator X then we got bottom right image .But i am interested to find coefficients tx or ty or transmittance of x |tx|^2 and |ty|^2 components  as i ahve mentioned in the attachment(Fig1).So i run the following script for the selected monitor.

      1. x135xy=getdata("monitor_4100","x");

      2. y135xy=getdata("monitor_4100","y");

      3.E135xy=getelectric("monitor_4100");

      4.Ex135xy=getdata("monitor_4100","Ex");

      5.Ey135xy=getdata("monitor_4100","Ey");

      6.Ez135xy=getdata("monitor_4100","Ez");

      7.Hy135xy=getdata("monitor_4100","Hy");

      8.Pxxx=Ex135xy*conj(Hy135xy);

      9.M_powerx = 0.5*integrate(real(Pxxx),1:2,x135xy,y135xy);

      10.f=3e8/1550e-9;

      11.P=sourcepower(f);

      12.TXX=M_powerx/P;%|tx|^2

      13.Pyyy=-1*Ey135xy*conj(Ex135xy);

      14.M_powery = 0.5*integrate(real(Pyyy),1:2,x135xy,y135xy);

      15.Tyy=M_powery/P;  %|ty|^2

      Plz let me is line 12 and line 15 of the script are providing transmittance |tx|^2 and |ty|^2 or just tx and ty.When i run the code i got following values 

       

       

    • Dev
      Ansys Employee

      Hello, 

      Thanks for using ALF. Can you elaborate what device are you simulating? 

      Thank you. 

       

    • uzmayaqoob1960
      Subscriber

      Mam its a metasurface.That is producing high intensity spot for the provided input.Metasurface consist of 6 regions meansits a kind of 2X3 lens array where each lens is sensitive to a specific polarization (sect 1 (bottom left)is for x-polrzied light,sect2 (bottom right for y-polarized light) ,sect 3(middle left for 45 degree polarized light),sec4(middle right for 135 degree polarized light) ,sec5 (is for RCP light),sec6 is for LCP light.Mam i found this answer of Gulin sir as mentioned in this linkhttps://innovationspace.ansys.com/forum/forums/topic/how-to-calculate-the-transmission-of-a-particular-polarized-tranmission-2/

       but i am unable to find values of RCP and LCP transmission as he suggested can you plz guide in this regard as they asked to decompose .How could we use poynting vector as he did for x and y polarized light.Plz mam help me in this regard

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