Hello, Meep --
I am having trouble understanding the meaning of the input variable 'm' for
cylindrical simulations. I have a circularly polarised plane wave (m=1) which
is being focused by a cylindrically symmetric structure. The source is
generated by taking (Er - i*Ephi), and I usually take m=1. However, I have
read that near a tight focus there can be small components with m=0,-1. When I
repeat the simulation with other m, the results are hard to understand
(sometimes suspicious narrow stripes on-axis, NaN's for m=-2, et cetera).
Can someone please tell me (or point me to a reference telling me) what the
variable m actually represents, and how it is used in the calculation? Is
there a 'correct' m for each source/structure combo (m=1 for mine), or should
the exact solution represent a series taken over all m, with contributions
(hopefully) becoming smaller for larger m?
Regards,
Jon Goldwin
______________________
Dr. Jon Goldwin
Centre for Cold Matter
Imperial College
London, UK
_______________________________________________
meep-discuss mailing list
[email protected]
http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
