title: Exact dipolar moments of a localized electric current distribution.
abstract: The multipolar decomposition of current distributions is used in many branches of physics. Here, we obtain new exact expressions for the dipolar moments of a localized electric current distribution. The typical integrals for the dipole moments of electromagnetically small sources are recovered as the lowest order terms of the new expressions in a series expansion with respect to the size of the source. All the higher order terms can be easily obtained. We also provide exact and approximated expressions for dipoles that radiate a definite polarization handedness (helicity). Formally, the new exact expressions are only marginally more complex than their lowest order approximations.
authors.forename: Ivan
authors.initials: I
authors.lastname: Fernandez-Corbaton
authors.forename: Stefan
authors.initials: S
authors.lastname: Nanz
authors.forename: Rasoul
authors.initials: R
authors.lastname: Alaee
authors.forename: Carsten
authors.initials: C
authors.lastname: Rockstuhl