Learning Forum

[paul.camus]

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

[Kirill]

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

 

[paul.camus]

Thank you for you links, it seems to be exactly what I am looking for.

 

Best regards,

Paul