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Does the Lumerical FDTD have an Order Sorting Aperture (OSA) function?

    • Yun
      Hi, I'm simulating the Zone Plate.
      View electric field images through the DFT monitor. (using farfield exact 3d script)
      Can I see only the electric field field values of the diffraction order I want among the implemented electric field images?
      Is there any possible way?
      I'd appreciate it if you could let me know.
      Can Lumerical implement OSA on its own?
      I just want to see images of a particular order diffracted electric field without changing the structure. Or I want to suppress certain order diffraction. such as zero order
    • Amrita Pati
      Ansys Employee

      Hi Yun,

      Only in periodic simulations, where you are simulating the unit cell of a periodic structure, you can project onto a grating order basis. But since this is a full simulation, it cannot be acheived directly. 

      To do it, we would have to find a way to filter specific diffraction orders from the field datasets collected from DFT monitors. I am in discussion with my colleagues to see if there is a straightforward way to do this by some post-processing steps using scripts. I will let you know soon when I have more information.


    • Yun
      Hi Amrita
      Thank you for your response.
      The bottom line is we can't see it yet.
      When I used zemax, I could only see a certain diffraction light with the diffract order function, so I thought it would be possible in lumerical fdtd
      so I'll be waiting for your information.. 
      Or can I input the zbf file I extracted through simulation into zemax to simulate only a specific diffracted light POP?
      What I want finally is to design an imaging optical system with my zone plate. So I want to delete all zero-order diffraction
      If simulation is possible with zemax, it is good news, but there is one problem. I extracted the zbf file through lumerical fdtd, but I don't know how to import the zbf into the zemax lens data or other place.
      I'd appreciate it if you could answer.
    • Guilin Sun
      Ansys Employee

      Hi, Yun,

      I believe the zbf import in Zemax has been replied in this forum.

      As for Lumerical FDTD, there is no such function to sort the diffraction order for non-periodic simulation. What you can do is:

      1: get the far field by use of farfieldexact ( for both E and H if necessary)

      2: once you can find the diffraction orders, you can then use a spatial filter to remove the unwanted orders.

      this will leave the desired-order E and H fieds. The you can further process the fields into Zemax or whatever the next step you want to do.

      Please note that although you can filter out the undesired orders, in real experiment they still exist.

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