Oscillating electric dipole source Comsol RF module

Dear All,

I have question.

I do simulations of plasmonic gap nanoantennas, and I want to excite antenna with dipole source which is placed and oscillate in the middle of the gap.


I have questions.

First, as I know unit for electric dipole moment is Cm (coulomb * meter), and in Comsol there is electric CURRENT dipole moment and unit is Am (amper * meter). I will mark electric dipole moment as P, and electric CURRENT dipole moment as PI.

My first question is how to set up equation in of “electric point dipole”? Is that for example just 1 [mA], or cos(emw.omega*t) [mA], or something else?

My second question is what is relation between P and PI. Is that PI = P/t (time), or PI = dP/dt, or maybe PI = P*emw.omega??

My third question is about Mie scattering. I want to calculate scattering and absorption cross section and I need electric field to calculate that.

Do you maybe know relation between electric current dipole moment and electric field??


Thanks for every reply and suggestion.