March 8, 2023 at 12:12 am
Guilin Sun
Ansys Employee

This may need multipole decomposition. Please refer:

https://optics.ansys.com/hc/en-us/articles/1500007399722-About-monopole-dipole-quadrupole-hexapole-octupole-etc

You may also need to get more information from the paper and its references.