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What theory uses Lumerical to compute farfield ?

- November 28, 2024 at 9:00 am
  
  paul.camus
  Subscriber
  
  Hello,
  I'm working on a grating coupler used as an antenna for my thesis and am using farfield projection of Lumerical for my simulations.
  However I could not find how Lumerical compute the farfield, with which theory : is it scalar (Fresnel, Fraunhoffer approximations ...) of vectorial ? I already checked some related article like this one : https://optics.ansys.com/hc/en-us/articles/360034914713-Far-field-projections-in-FDTD-overview but I would like to know how the propagation is done.
  At the moment I am using this feature like a black box, which is a problem if I want to thouroughly understand my simulation results. Could you tell me what theory is used for farfield projection ?
  Yours sincerely
- November 28, 2024 at 7:39 pm
  
  Kirill
  Ansys Employee
  
  Hello Paul,
  The FDTD far-field approach is based on the radiation integral; see the article Far field projections in DGTD overview. Although the article focuses on DGTD, the principle of far-field projection remains the same.
  For more details on the method, you can refer to the following chapter: Chapter 14: Far-Field Transformations.
  Best regards,
  Kirill
- December 2, 2024 at 3:37 pm
  
  paul.camus
  Subscriber
  
  Thank you for you links, it seems to be exactly what I am looking for.
  
  Best regards,
  Paul

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